Module 1 11

8/3/2019 Module 1 11

1/78

1

Cisco CCNA exploration v 4.0, module 2, chapter 1 Exam.

Questions and answers 100% correct.

1. Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and

interfaces that can be protected with passwords. (Choose three.)

VTY interface

console interface

Ethernet interface

secret EXEC mode

privileged EXEC mode

router configuration mode

2.

Refer to the exhibit. What can be concluded from the output of the running-configuration of a router?

The passwords are encrypted.

The current configuration was saved to NVRAM.

The configuration that is shown will be the one used on the next reboot.

The commands that are displayed determine the current operation of the router.

8/3/2019 Module 1 11

2/78

2

3.

Which interfaces in the exhibit could be used for a leased line WAN connection? (Choose two.)

1

2

3

4

5

6

4. What is the default sequence for loading the configuration file?

NVRAM, FLASH, ROM

FLASH, TFTP,CONSOLE

NVRAM, TFTP, CONSOLE

FLASH, TFTP, ROM

5. The network administrator needs to connect two routers directly via their FastEthernet ports. What

cable should the network administrator use?

straight-through

rollover

cross-over

serial
http://nj180degree.net/wp-content/uploads/2010/03/02.jpghttp://nj180degree.net/wp-content/uploads/2010/03/02.jpghttp://nj180degree.net/wp-content/uploads/2010/03/02.jpghttp://nj180degree.net/wp-content/uploads/2010/03/02.jpghttp://nj180degree.net/wp-content/uploads/2010/03/02.jpg

8/3/2019 Module 1 11

3/78

3

6.

Refer to the exhibit. All routers have a route in its routing table to each network that is shown in the

exhibit. Default routes have not been issued on these routers. What can be concluded about how

packets are forwarded in this network? (Choose two.)

If RouterC receives a packet that is destined for 10.5.1.1, it will be forwarded out interface Fa0/0.

If RouterA receives a packet that is destined for 192.168.3.146, it will be forwarded out interface S0/0/1.

If RouterB receives a packet that is destined for 10.5.27.15, it will be forwarded out interface S0/0/1.

If RouterB receives a packet that is destined for 172.20.255.1, it will be forwarded out interface S0/0/0.

If RouterC receives a packet that is destined for 192.16.5.101, it will be forwarded out interface S0/0/1.

7. Which two statements correctly describe the components of a router? (Choose two.)

RAM permanently stores the configuration file used during the boot sequence.

ROM contains diagnostics executed on hardware modules.

NVRAM stores a backup copy of the IOS used during the boot sequence.

Flash memory does not lose its contents during a reboot.

ROM contains the most current and most complete version of the IOS.

Flash contains boot system commands to identify the location of the IOS.

8. A network administrator has just entered new configurations into Router1. Which command should be

executed to save configuration changes to NVRAM?

Router1# copy running-config flash

Router1(config)# copy running-config flash

Router1# copy running-config startup-config

Router1(config)# copy running-config startup-config

Router1# copy startup-config running-config

Router1(config)# copy startup-config running-config

8/3/2019 Module 1 11

4/78

4

9.

Refer to the exhibit. Host A pings host B. When R4 accepts the ping into the Ethernet interface, what

two pieces of header information are included? (Choose two.)

source IP address: 192.168.10.129

source IP address: BBBB.3333.5677

source MAC address: 5555.AAAA.6666

destination IP address: 192.168.10.33

destination IP address: 192.168.10.134

destination MAC address: 9999.DADC.1234

10. From what location can a router load the Cisco IOS during the boot process? (Choose two.)

RAM

TFTP server

NVRAM

setup routine

Flash memory

Terminal

11. If a router cannot find a valid configuration file during the startup sequence, what will occur?

The startup sequence will reset.

The router will prompt the user for a response to enter setup mode.

The startup sequence will halt until a valid configuration file is acquired.

The router will generate a default configuration file based on the last valid configuration.

The router will monitor local traffic to determine routing protocol configuration requirements.

12. Which two statements describe characteristics of load balancing? (Choose two.)

Load balancing occurs when a router sends the same packet to different destination networks.

Load balancing occurs when the same number of packets are sent over static and dynamic routes.

Load balancing allows a router to forward packets over multiple paths to the same destination network.Unequal cost load balancing is supported by EIGRP.

8/3/2019 Module 1 11

5/78

5

If multiple paths with different metrics to a destinations exist, the router cannot support load balancing.

13. Which of the following is the correct flow of routines for a router startup?

load bootstrap, load IOS, apply configuration

load bootstrap, apply configuration, load IOS

load IOS, load bootstrap, apply configuration, check hardware

check hardware, apply configuration, load bootstrap, load IOS

14.

Refer to the exhibit. The network administrator has configured the router with the interface IP

addresses shown for the directly connected networks. Pings from the router to hosts on the

connected networks or pings between router interfaces are not working. What is the most likely

problem?

The destination networks do not exist.

The IP addresses on the router interfaces must be configured as network addresses and not host

addresses.

The interfaces must be enabled with the no shutdown command.

Each interface must be configured with the clock rate command.

15.

Refer to the exhibit. After host 2 is connected to the switch on the LAN, host 2 is unable to

communicate with host 1. What is the cause of this problem?

The subnet mask of host 2 is incorrect.

Host 1 and host 2 are on different networks.

The switch needs an IP address that is not configured.

8/3/2019 Module 1 11

6/78

6

The router LAN interface and host 1 are on different networks.

The IP address of host 1 is on a different network than is the LAN interface of the router.

16. What three processes does a router execute when it receives a packet from one network that is

destined for another network? (Choose three.)

decapsulates the Layer 3 packet by stripping off the Layer 2 frame header

uses the destination MAC Address in the IP Header to look up the next-hop address in the routing table

leaves the Layer 2 frame header intact when decapsulating the Layer 3 packet

uses the destination IP Address in the IP header to look up the next-hop address in the routing table

encapsulates the Layer 3 packet into the new Layer 2 frame and forwards it out the exit interface

encapsulates the Layer 3 packet into a special Layer 1 frame and forwards it to the exit interface

17. What header address information does a router change in the information it receives from an attached

Ethernet interface before information is transmitted out another interface?

only the Layer 2 source address

only the Layer 2 destination address

only the Layer 3 source address

only the Layer 3 destination address

the Layer 2 source and destination address

the Layer 3 source and destination address

18.

Refer to the exhibit. What can be concluded from the routing table output in the exhibit? (Choose

two.)

This router only has two interfaces.

The router interfaces are not operational yet.

This router is configured to forward packets to remote networks.

The FastEthernet0/0 and Serial0/0/0 interfaces of this router were configured with an IP address and

the no shutdown command.

8/3/2019 Module 1 11

7/78

7

An IP packet received by this router with a destination address of 198.18.9.1 will be forwarded out of

the Serial0/0/0 interface.

19. Which are functions of a router? (Choose three.)

packet switching

extension of network segments

segmentation of broadcast domains

selection of best path based on logical addressing

selection of best path based on physical addressing

20.

What is the outcome of entering these commands?

R1(config)# line vty 0 4

R1(config-line)# password check123

R1(config-line)# login

ensures that a password is entered before entering user EXEC mode

sets the password to be used for connecting to this router via Telnet

requires check123 to be entered before the configuration can be saved

creates a local user account for logging in to a router or switch

21.

The serial connection shown in the graphic needs to be configured. Which configuration commands

must be made on the Sydney router to establish connectivity with the Melbourne site? (Choose three.)

Sydney(config-if)# ip address 201.100.53.2 255.255.255.0

Sydney(config-if)# no shutdown

Sydney(config-if)# ip address 201.100.53.1 255.255.255.224

Sydney(config-if)# clock rate 56000

Sydney(config-if)# ip host Melbourne 201.100.53.2

8/3/2019 Module 1 11

8/78

8



1. The output of the Router# show interfaces serial 0/1 command displays the following:

Serial0/1 is up, line protocol is down.

What is the most likely cause for the line protocol being down?

Serial0/1 is shutdown.

There is no cable connecting the routers.

The remote router is using serial 0/0.

No clock rate has been set.

2. Which address can be used to summarize networks 172.16.0.0/24 thru 172.16.7.0/24?

172.16.0.0/21

172.16.1.0/22

172.16.0.0 255.255.255.248

172.16.0.0 255.255.252.0

3.

Refer to the exhibit. How will packets destined to the 172.16.0.0 network be forwarded?

Router1 will perform recursive lookup and packet will exit S0/0.

Router1 will perform recursive lookup and packet will exit S0/1.

There is no matching interface associated with network 172.16.0.0 so packets will be dropped.

There is no matching interface associated with network 172.16.0.0 so packets will take gateway of last

resort and exit out S0/2.

8/3/2019 Module 1 11

9/78

9

4. A static route that points to the next hop IP will have what administrative distance and metric in the routing

table?

administrative distance of 0 and metric of 0

administrative distance of 0 and metric of 1

administrative distance of 1 and metric of 0administrative distance of 1 and metric of 1

5. Hosts on two separate subnets cannot communicate. The network administrator suspects a missing route in

one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity

issues? (Choose three.)

ping

show arp

traceroute

show ip route

show controllers

show cdp neighbor

6.

Refer to the exhibit. Which static route should be configured on Router1 so that host A will be able to reach

host B on the 172.16.0.0 network?

ip route 192.168.0.0 172.16.0.0 255.255.0.0

ip route 172.16.0.0 255.255.0.0 192.168.0.1

ip route 172.16.0.0 255.255.0.0 S0/0/1

ip route 172.16.0.0 255.255.0.0 S0/0/0

7. Which of the following are displayed by the Router# show cdp neighbors command? (Choose three.)

load

platform

reliability

holdtime

local interface

8. Why is it advisable to enter a next-hop IP address when creating a static route whose exit interface is an

Ethernet network?

8/3/2019 Module 1 11

10/78

10

Adding the next-hop address eliminates the need for the router to do any lookups in the routing table

before forwarding a packet.

In a multi-access network, the router cannot determine the next-hop MAC address for the Ethernet frame

without a next-hop address.

Using a next-hop address in a static route provides a route with a lower metric.

In multi-access networks, using a next-hop address in a static route makes that route a candidate default

route.

9.

Refer to the exhibit. Which set of commands will configure static routes that will allow the WinterPark and the

Altamonte routers to deliver packets from each LAN and direct all other traffic to the Internet?

WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2

Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/1

WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1

Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2








10. What happens to a static route entry in a routing table when the outgoing interface is not available?

The route is removed from the table.

The router polls neighbors for a replacement route.

The route remains in the table because it was defined as static.

The router redirects the static route to compensate for the loss of the next hop device.

11. What address can be used to summarize networks 172.16.0.0/24 thru 172.16.7.0/24?

172.16.0.0/21

172.16.1.0/22

8/3/2019 Module 1 11

11/78

11

172.16.0.0 255.255.255.248

172.16.0.0 255.255.252.0

12.

Refer to the exhibit. Given the output in the exhibit, how would a clock rate be determined for this link?

The rate would be negotiated by both routers.

A rate would not be selected due to the DCE/DTE connection mismatch.

The rate configured on the DTE determines the clock rate.The rate configured on the DCE determines the clock rate.

13. Which piece of information is available from examining the output of the command show ip interface brief?

Interface speed and duplex

Interface MTU

Errors

Interface MAC address

Interface IP address

14. What two devices are responsible for converting the data from the WAN service provider into a form

acceptable by the router? (Choose two).

the serial port of the router

a modem

a switch

the ethernet port of the router

a CSU/DSU device

a DTE device

15.

Refer to the exhibit. What two commands are required to provide connectivity between the 192.168.1.0 and

10.0.0.0 networks without requiring recursive lookup? (Choose two.)

A(config)# ip route 10.0.0.0 255.0.0.0 s 0/1/0

8/3/2019 Module 1 11

12/78

12

A(config)# ip route 10.0.0.0 255.0.0.0 172.16.40.2

A(config)# ip route 10.0.0.0 255.0.0.0 s 0/0/0

B(config)# ip route 192.168.1.0 255.255.255.0 s 0/0/0

B(config)# ip route 192.168.1.0 255.255.255.0 172.16.40.1

B(config)# ip route 192.168.1.0 255.255.255.0 s 0/1/0

16. A router has one static route configured to each destination network. Which two scenarios would require an

administrator to alter the static routes that are configured on that router? (Choose two.)

The destination network no longer exists.

The destination network is moved to a different interface on the same router.

The path between the source and destination is upgraded with a higher bandwidth link.

The remote destination network interface has to be down for 15 minutes of maintenance.

A topology change occurs where the existing next-hop address or exit interface is not accessible.

17. A network administrator enters the following command into Router1: ip route 192.168.0.0 255.255.255.0

S0/1/0. Router1 then receives a packet that is destined for 192.168.0.22/24. After finding the recently

configured static route in the routing table, what does Router1 do next to process the packet?

drops the packet because the destination host is not listed in the routing table

looks up the MAC address of the S0/1/0 interface to determine the destination MAC address of the

new frame

performs a recursive lookup for the IP address of the S0/1/0 interface before forwarding the packet

encapsulates the packet into a frame for the WAN link and forwards the packet out the S0/1/0

interface

18.

Refer to the exhibit. A company network engineer is assigned to establish connectivity between the two

Ethernet networks so that hosts on the 10.1.1.0/24 subnet can contact hosts on the 10.1.2.0/24 subnet. The

engineer has been told to use only static routing for these company routers. Which set of commands will

establish connectivity between the two Ethernet networks?

R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1

8/3/2019 Module 1 11

13/78

13

R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2

R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2

R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1

R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2

R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1

R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1

R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2

R1(config)# ip route 0.0.0.0 0.0.0.0 10.1.2.1

R2(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1

19.

Refer to the exhibit. What is the significance of the /8 in the route to the 10.0.0.0 network?

It indicates that there are 8 hops between this router and the 10.0.0.0 network.

It represents the time, in milliseconds, it takes for a ping to reply when sent to the 10.0.0.0 network.

It indicates that there are 8 subnets in the destination network to which the router can forward packets.

It indicates the number of consecutive bits, from the left, in the destination IP address of a packet that

must match 10.0.0.0 to use that route.

20.

Refer to the exhibit. What two commands will change the next-hop address for the 10.0.0.0/8 network from

172.16.40.2 to 192.168.1.2? (Choose two.)

A(config)# no network 10.0.0.0 255.0.0.0 172.16.40.2A(config)# no ip address 10.0.0.1 255.0.0.0 172.16.40.2

8/3/2019 Module 1 11

14/78

14

A(config)# no ip route 10.0.0.0 255.0.0.0 172.16.40.2

A(config)# ip route 10.0.0.0 255.0.0.0 s0/0/0

A(config)# ip route 10.0.0.0 255.0.0.0 192.168.1.2

21. Which two statements describe functions or characteristics of CDP? (Choose two.)It starts up automatically and allows the device to detect directly connected neighbor devices that use

CDP.

It operates at the network layer and allows two systems to learn about each other.

It creates a topology map of the entire network.

It allows systems to learn about each other even if different network layer protocols are configured.

It forwards advertisements about routes for faster convergence.

22.

Which of the following is true regarding CDP and the graphic shown?

CDP running on Router D will gather information about routers A, B, C, and E.By default, Router A will receive CDP advertisements from routers B and C.

If routers D and E are running different routing protocols, they will not exchange CDP information.

Router E can use CDP to identify the IOS running on Router B.

8/3/2019 Module 1 11

15/78

15



1. Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)

Administrative distance refers to the trustworthiness of a particular route.

A router first installs routes with higher administrative distances.

The value of the administarive distance can not be altered by the network administrator.

Routes with the smallest metric to a destination indicate the best path.

The metric is always determined based on hop count.

The metric varies depending which Layer 3 protocol is being routed, such as IP or IPX.

2.

Refer to the exhibit. Which statement correctly describes how R1 will determine the best path to R2?

R1 will install a RIP route using network A in its routing table because the administrative distance of RIP is higher

than EIGRP.

R1 will install a RIP route using network A in its routing table because the path cost from RIP is lower than EIGRP.

R1 will install an EIGRP route using network B in its routing table because the administrative distance of EIGRP is

lower than RIP.

R1 will install an EIGRP route using network B in its routing table because the path cost from EIGRP is lower than

RIP.

R1 will install an EIGRP route and a RIP route in its routing table and load balance between them.

3. Which two statements are true regarding classless routing protocols? (Choose two.)

sends subnet mask information in routing updates

sends complete routing table update to all neighbors

is supported by RIP version 1

allows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topology

reduces the amount of address space available in an organization

4. Which command would the network administrator issue to determine if load balancing is in effect on a router?

show ip protocols

8/3/2019 Module 1 11

16/78

16

show ip route

show ip interface brief

show ip interface

5. Which two conditions would create a setting where the use of a distance-vector routing protocol would be efficient?

(Choose two.)

the network requires a special hierarchical design

fast convergence of the network is crucial

the network is using a hub and spoke topology

the network is using a flat design

there are more than 15 hops between the most distant routers

6. What is the purpose of a routing protocol?

It is used to build and maintain ARP tables.

It provides a method for segmenting and reassembling data packets.

It allows an administrator to devise an addressing scheme for the network.

It allows a router to share information about known networks with other routers.

It provides a procedure for encoding and decoding data into bits for packet forwarding.

7. Which of the following best describes the operation of distance vector routing protocols?

They use hop count as their only metric.

They only send out updates when a new network is added.

They send their routing tables to directly connected neighbors.

They flood the entire network with routing updates.

8. When multiple routing protocols have a route to the same destination network, what determines which route is installed in

the routing table?

best metric

lowest hop count

greatest available bandwidth

lowest administrative distance

lowest cost

9. Why is fast convergence desirable in networks that use dynamic routing protocols?

Routers will not allow packets to be forwarded until the network has converged.

Hosts are unable to access their gateway until the network has converged.

Routers may make incorrect forwarding decisions until the network has converged.

Routers will not allow configuration changes to be made until the network has converged.

10. Which of the following conditions must be met in order for a network to have converged?

8/3/2019 Module 1 11

17/78

17

The routers in the network are operating with dynamic routing protocols.

The routers in the network are operating with compatible versions of IOS.

The routers in the network are operating with the same routing tables.

The routers in the network are operating with consistent routing knowledge.

11. Which two statements are true regarding metrics? (Choose two.)

RIP uses bandwidth as a metric.

OSPF uses delay as a metric.

EIGRP uses bandwidth as a metric.

OSPF uses cost based on bandwidth as a metric.

RIP uses delay as a metric.

EIGRP uses hop count only as a metric.

12. Which two statements are true regarding the advantages of the use of static routes? (Choose two).

increased security

reduced effort in configuring routes

the administrator maintains control over routing

easier to implement in a growing network

reduces the chance of routing errors

increased router resource usage

13.The following line of code is displayed in a routing table:

R 209.165.201.0/24 [120/2] via 192.168.252.2, 00:00:16, S0/0/0

What can be concluded from this output?

A packet destined for host 192.168.252.2 will be forwarded out the interface connected to network

209.165.201.0/24.

The value, 120, is used to determine the best path when a router has more than one routing protocol configured for

the same destination network.

This route was manually configured using the ip route command.

192.168.252.2 is an interface on the router that produced this output.

14.

What will be the result of the following commands?

ORL(config)# interface fastethernet 0/0

ORL(config-if)# ip address 172.16.3.1 255.255.255.0

ORL(config-if)# no shutdown

The 172.16.3.0 network will be routed by any dynamic routing protocol automatically.

A routing table entry is made to the 172.16.3.0 network with a code of "C".

8/3/2019 Module 1 11

18/78

18

A static route is required to route traffic to the 172.16.3.0 network.

The commands will be saved to the startup-configuration automatically.

15. An engineer creates a static route by entering the Router(config)# ip route 10.0.0.0 255.255.255.0

192.168.1.2 command. What can be concluded about this route?

The administrative distance of this route is 1.

192.168.1.2 is the address of an interface on this router.

This route will display as a directly connected network in the routing table.

Packets with a destination IP address of 192.168.1.2 will be forwarded to the 10.0.0.0/24 network first.

16.

Refer to the exhibit. Router1 and Router2 are running EIGRP. All interfaces are operational and packets can be

forwarded between all networks. What information will be found in the routing table for Router1?

Router1 will have 6 directly connected networks.

The administrative distance of the route to network 172.16.0.0 will be 90.

The metric for routes to 172.16.0.0 will be 1.

The interface that is used to forward packets to 172.16.0.0 will always be the S0/1 interface.

17.

The following line of code is present in the routing table:

O 10.16.1.0/27 [110/129] via 192.168.1.5, 00:00:05, Serial0/0/1

What does the number 129 indicate in this output?

The cost for this link has a value of 129.

The clock rate on this serial interface is set to 129,000.

The next-hop router is 129 hops away from this router.

This route has been updated 129 times in this routing table.

18. A growing medium-sized manufacturing company recently began to have routing instability issues. The company uses

static routes and has a mixture of over 30 Cisco and non-Cisco routers. The network administrator has decided to convert

the network to dynamic routing. What characteristics of protocols should be considered in this selection process?

Distance vector routing protocols, such as RIP, converge more quickly than do link-state routing protocols.

EIGRP can be used on all of the routers in the company.

8/3/2019 Module 1 11

19/78

19

OSPF can be used between the routers.

An exterior routing protocol, such as BGP, is recommended for growing companies.

19.

Refer to the exhibit. If RIP is the routing protocol, what is the value of the metric from router A to network

192.168.5.0/24?

3

4

56

624

724

20. A router learns two paths with equal metrics to a destination network via the RIP routing protocol. How will the router

handle packets to the destination network?

The router will install the first route it learned into the routing table.

The router will install both routes in the routing table and load balance between the two.

The router will put the first route in the routing table, and denote the second route as a backup route.

The router will pick the path with the higher bandwidth and will place it in the routing table.

8/3/2019 Module 1 11

20/78

20



1. Which event will cause a triggered update?an update routing timer expires

a corrupt update message is received

a route is installed in the routing table

the network is converged

2. Three routers running a distance-vector routing protocol lost all power, including the battery backups. When

the routers reload, what will happen?

They will share all routes saved in NVRAM prior to the power loss with their directly connectedneighbors.

They will multicast hello packets to al l other routers in the network to establish neighbor adjacencies.

They will send updates that include only directly connected routes to their directly connected neighbors.

They will broadcast their full routing table to all routers in the network.

3. What does the RIP holddown timer do?

ensures an invalid route has a metric of 15

prevents a router from sending any updates after it has introduced a routing loop into the network

ensures every new route is valid before sending an update

instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes

4. Which two statements are true regarding the function of the RIPv1 routing updates? (Choose two).

updates are broadcast only when there are changes to the topology

updates are broadcast at regular intervals

broadcast are sent to 0.0.0.0

broadcasts are sent to 255.255.255.255

updates contain the entire network topology

only changes are included in the updates

5. Which of the following statements are correct about RIP?

uses a broadcast to update all other routers in the network every 60 seconds

uses a multicast address to update other routers every 90 seconds

will send out an update if there is a failure of a linkupdates only contain information about routes that have changed since last update

8/3/2019 Module 1 11

21/78

21

6. Which two statements describe EIGRP? (Choose two.)

EIGRP can be used with Cisco and non-Cisco routers.

EIGRP sends triggered updates whenever there is a change in topology that influences the routing

information.

EIGRP has an infinite metric of 16.

EIGRP sends a partial routing table update, which includes just routes that have been changed.

EIGRP broadcasts its updates to all routers in the network.

7. Which statement is true regarding ciscos RIP_JITTER variable?

It prevents the synchronization of routing updates by buffering the updates as they leave the router

interfaces.

It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0%

to 15% of the specified interval time from the next routing update interval.

It prevents the synchronization of routing updates by causing the router to skip every other scheduled

update time.

It prevents the synchronization of routing updates by forcing the router to l isten when its time for other

updates on the lines before sending its update.

8.

What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)

RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.

During the next update interval, RouterB will send a RIP update out both ports that includes the

inaccessible network.During the next update interval, RouterC will send an update to RouterB stating that network 114.125.16.0

is accessible in 2 hops.

Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.

RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterC.

9. Which of the following methods does split horizon use to reduce incorrect routing information?

Routing updates are split in half to reduce the update time.

Information learned from one source is not distributed back to that source.

New route information must be learned from multiple sources to be accepted.

8/3/2019 Module 1 11

22/78

22

The time between updates is split in half to speed convergence.

New route information is suppressed until the system has converged.

10.

The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to

Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which

routing loop prevention mechanism is in effect?

split horizon

error condition

hold-down timer

route poisoning

count to infinity

11. What is the purpose of the TTL field in the IP header?

used to mark routes as unreachable in updates sent to other routers

prevents regular update messages from reinstating a route that may have gone bad

prevents a router from advertising a network through the interface from which the update came

limits the time or hops that a packet can traverse through the network before it should be discarded

defines a maximum metric value for each distance vector routing protocol by setting a maximum hop

count

12. Which of the following can exist in a distance vector network that has not converged? (Choose three.)

routing loops

inconsistent traffic forwarding

no traffic forwarding until system converges

inconsistent routing table entries

routing table updates sent to wrong destinations

8/3/2019 Module 1 11

23/78

23

13.

Refer to the exhibit. The routers in this network are running RIP. Router A has not received an update from

Router B in over three minutes. How will Router A respond?

The Holddown timer will wait to remove the route from the table for 60 seconds.

The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.

The Update timer will request an update for routes that were learned from Router B.

The Hello timer will expire after 10 seconds and the route will be flushed out of the routing table.

14. A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to

congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP

instead of RIP in this case? (Choose two.)

EIGRP uses periodic updates.

EIGRP only updates affected neighbors.

EIGRP uses broadcast updates.

EIGRP updates are partial.

EIGRP uses the efficient Bellman-Ford algorithm.

15.

Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8

network if RIP is the active routing protocol?

The path will be router A -> router B -> router C -> router E.

The path will be router A -> router D -> router E.

Router A will load balance between the router A -> router D -> router E and router A -> router B ->

router C -> router E paths.

8/3/2019 Module 1 11

24/78

24

Packets will alternate paths depending on the order they arrive at router A.

16. Which three routing protocols are distance vector routing protocols? (Choose three).

RIPv1

EIGRP

OSPF

IS-IS

RIPv2

17. What is a routing loop?

a packet bouncing back and forth between two loopback interfaces on a router

a condition where a return path from a destination is different from the outbound path forming a loop

a condition where a packet is constantly transmitted within a series of routers without ever reaching its

intended destination

the distribution of routes from one routing protocol into another

18. Which two conditions are most likely to cause a routing loop? (Choose two.)

random jitter

implementation of classful addressinginconsistent routing tables

incorrectly configured static routes

a network converging too quickly

19. What metric does the RIP routing protocol consider to be infinity?

0

15

16

224

255

8/3/2019 Module 1 11

25/78

25

20.

Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers

know all networks?

1

2

3

4

5

6

8/3/2019 Module 1 11

26/78

8/3/2019 Module 1 11

27/78

27

3.

Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network administrator configures

the commandnetwork 10.1.0.0 on Router1. What network will Router1 advertise to Router2?

10.1.0.0/16

10.1.0.0/8

10.0.0.0/16

10.0.0.0/8

4. Which of the following would be the correct command sequence to enable RIP on Router B for all connected

networks?

RouterB# router rip

RouterB(router)# network 210.36.7.0



RouterB(config)# router rip

RouterB(config-router)# network 198.16.4.0



RouterB(config)# configure router rip












5. Which command will display RIP activity as it occurs on a router?

debug ip rip

show ip routeshow ip interface

8/3/2019 Module 1 11

28/78

28

show ip protocols

debug ip rip config

show ip rip database

6. Which command or set of commands will stop the RIP routing process?


RouterB(config-router)# shutdown


RouterB(config-router)# network no 192.168.2.0

RouterB(config)# no router rip

RouterB(config)# router no rip

7.

Refer to the exhibit. RIPv1 is running on all three routers. All interfaces have been correctly configured with

addresses in the address ranges that are shown. Which route would you see in the routing table on router CHI

if the routers are configured with the commands that are displayed in the exhibit?

192.168.0.4/30

192.168.0.0/24

192.168.0.0/16

192.168.0.32/27

8.

The following line was displayed in the output of the show ip route command.

R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0

What is the value of the routing metric?

3

1220

8/3/2019 Module 1 11

29/78

29

30

120

9. Which of the following is considered a limitation of RIP v1?

RIP v1 does not send subnet mask information in its updates.

RIP v1 is not widely supported by networking hardware vendors.

RIP v1 consumes excessive bandwidth by multicasting routing updates using a Class D address.

RIP v1 requires enhanced router processors and extra RAM to function effectively.

RIP v1 does not support load balancing across equal-cost paths.

RIP v1 authentication is complicated and time-consuming to configure.

10. What are three characteristics of the RIPv1 routing protocol? (Choose three.)

supports the use of VLSM

uses hop count as a metric

considers a metric of 16 as infinity

has an administrative distance of 110 by default

includes the destination IP address and subnet mask in routing updates

calculates metrics using the Bellman Ford algorithm

11. What will happen if an interface IP address is entered for the address portion of the network command in a

RIPv1 configuration instead of a network address?

The router will reject the command.

A route to the host address will be added to outgoing RIP updates.

A route to the host address will be added to the routing table.

All interfaces in the same classful network as the configured address will be included in the RIPv1 routing

process.

12. Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unknown IP traffic

must be forwarded to the ISP. What router or set of routers are recommended to have both a default route

and the default-information originate command issued to implement this forwarding policy?

only Router1

only the gateway router

all routers in the network

only the routers with LANs needing Internet access

8/3/2019 Module 1 11

30/78

30

13.

Refer to the exhibit. All routers are configured with valid interface addresses in the indicated networks and are

running RIPv1. The network is converged. Which routes are present in the routing tables?

All routers have all routes in their routing table.

All routers have all /30 routes, but do not have /24 routes in their routing table.

All routers have all /30 routes. Routers A and E also have some of the /24 routes in their routing table.

All routers have all /30 routes. Routers B and D also have some of the /24 routes in their routing table.

Routers A and E have all routes. Routers B and D have only /30 routes in their routing table

Routers A and E have only /24 routes. Routers B and D have only /30 routes in their routing table.

14. Refer to the exhibit. A network consists of multiple routers. What can be verified when the show ip protocols

command is issued on one of the routers in the network?

whether all routes in the network have been properly added to the routing table

routing protocol configuration in use for IP on this router

operational status of routing protocols in use on all routers in the network

routing metric of each network that is listed in the routing table

15.

Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator notices that the route

is still valid in the routing table of Router1. How much longer will it take for Router1 to mark the route invalid

by setting the metric to 16?

30 seconds

8/3/2019 Module 1 11

31/78

31

90 seconds

155 seconds

180 seconds

255 seconds

16. What is the default update period in seconds for the RIP routing protocol?

10

12

15

20

30

60

17. Refer to the exhibit. What can be concluded from the routing table output of router B?

A static default route has been configured on B.

The default-information originate command has been entered on A.

All traffic that is destined for 192.168.1.1 will be sent to address 0.0.0.0.

Hosts on the 10.16.1.0/27 network have 192.168.1.1 configured as the default gateway address.

18. Which two statements are true regarding the characteristics of RIPv1? (Choose two).

It is a distance vector routing protocol.

It advertises the address and subnet mask for routes in routing updates.

The data portion of a RIP message is encapsulated into a TCP segment.

The data portion of a RIP message is encapsulated into a UDP segment.

It broadcasts updates every 15 seconds.

It allows a maximum of 15 routers in the routing domain.

19.

Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 network was recently

8/3/2019 Module 1 11

32/78

32

added and will only contain end users. What command or set of commands should be entered on Router1 to

prevent RIPv1 updates from being sent to the end user devices on the new network while still allowing this

new network to be advertised to other routers?

Router1(config-router)# no router rip

Router1(config-router)# network 192.168.10.0

Router1(config-router)# no network 192.168.10.0

Router1(config-router)# passive-interface fastethernet 0/0

Router1(config-router)# passive-interface serial 0/0/0

8/3/2019 Module 1 11

33/78

33

Module 6

1. What two advantages does CIDR provide to a network? (Choose two.)

reduced routing table size

dynamic address assignmentautomatic route redistribution

reduced routing update traffic

automatic summarization at classful boundaries

2.

Refer to the exhibit. The network administrator wants to create a subnet for the point-to-point connection

between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link

with the least number of wasted addresses?

255.255.255.192

255.255.255.224

255.255.255.240

255.255.255.248

255.255.255.252

3.

Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the

exhibit. Which summarization will work for all the subnets?

192.168.0.0/23192.168.0.0/22

192.168.0.0/21

192.168.0.0/20

4. Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)

32-bit address

next hop router interface

subnet mask

unicast host address

8/3/2019 Module 1 11

34/78

34

Layer 2 address

5. Which of the following problems does VLSM help to alleviate?

the shortage of IP addresses

the difficulty of assigning static IP addresses to hosts in large enterprises

the complexity of implementing advanced routing protocols such as OSPF and EIGRP

the shortage of network administrators qualified in the use of RIP v1 and IGRP

6. What does VLSM allow a network administrator to do?

utilize one subnet mask throughout an autonomous system

utilize multiple subnet masks in the same IP address space

utilize IGRP as the routing protocol in an entire autonomous system

utilize multiple routing protocols within an autonomous system

7.

Refer to the exhibit. What subnet mask will be applied by router B when it receives a RIPv1 update for the

network 172.16.1.0?

none

8

16

24

8/3/2019 Module 1 11

35/78

35

8.

Refer to the exhibit. The network administrator wants to minimize the number of entries in Router1's routing

table. What should the administrator implement on the network?

VLSM

CIDR

private IP addresses

classful routing

9. A router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks

are summarized by this route?

192.168.0.0 192.168.32.0/24

192.168.0.0 192.168.47.0/24

192.168.32.0 192.168.47.0/24

192.168.32.0 192.168.48.0/24

192.168.32.0 192.168.63.0/24

10. A network administrator is tasked with dividing up a class C network among the QA, Sales, and Administration

departments. The QA department is made up of 10 people, the Sales is made up of 28 people, and the

Administration has 6. Which two subnets masks adequately address the QA and Sales departments?

(Choose two.)

255.255.255.252 for QA

255.255.255.224 for Sales

255.255.255.240 for QA

255.255.255.248 for QA

255.255.255.0 for Sales

8/3/2019 Module 1 11

36/78

36

11.

In the network shown in the graphic, three bits were borrowed from the host portion of a Class C address.

How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not

used?

3

4

12

36

84

180

12.

A Class C address has been assigned for use in the network shown in the graphic. Using VLSM, which bit

mask should be used to provide for the number of host addresses required on Router A, while wasting the

fewest addresses?

/31

/30

/29

/28

/27

/26

8/3/2019 Module 1 11

37/78

37

13.

An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the

diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of

14 useable addresses for this link while wasting the fewest addresses?

192.1.1.16/26

192.1.1.96/28

192.1.1.160/28

192.1.1.196/27

192.1.1.224/28

192.1.1.240/28

14. Which three interior routing protocols support VLSM? (Choose three.)

OSPF

RIP v1

RIP v2

EIGRP

BGP

STP

15.

Refer to the exhibit. The number of required host addresses for each subnet in a network is listed in the

exhibit. This number includes the host address requirements for all router ports and hosts on that subnet.

After all device and router port address assignments are determined, what will be the total number of unused

host addresses available?

6

14

29

34

8/3/2019 Module 1 11

38/78

38

40

62

16.

Refer to the exhibit. In the network that is shown, the router interfaces are assigned the first address in each

subnet. Which IP address would be usable for a host on one of the LANs in this network?

192.168.1.5/30

192.168.2.17/28

192.168.2.63/27

192.168.2.130/25

17.

Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the

exhibit?

192.168.4.3/29

192.168.4.15/29

192.168.4.65/26

192.168.4.255/24

18.

Refer to the exhibit. A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router

running RIPv2. The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts. The network

administrator assigned 10.0.1.128/25 to the Admin subnet. The Sales subnet is given 10.0.1.192/26. What willbe the result of this addressing scheme?

8/3/2019 Module 1 11

39/78

39

Because RIPv2 does not support VLSM, the subnet masks will not be allowed.

The subnets will not have enough host addresses for the given network requirements.

The subnets overlap and will be rejected by the router.

The router will support the addressing scheme.

19.

Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A

ping from R1 to Host B fails. The technician begins testing the network and has the following results:

1. pings from R1 to the S0/0/0 interface on R2....successful2. pings from R1 to the Fa0/0 interface on R2....successful3. pings from Host B to hosts on the 10.1.1.0/24 network....successful4. pings from Host B to the Fa0/0 interface on R2....successful5. pings from R2 to Host B....successful

What is the likely cause of the failure of the ping from R1 to Host B?

Host B has a defective Ethernet card.

The default gateway on Host B is not correctly set.

There is a Layer 2 problem between R2 and Host B.

R2 does not have routes back to networks connected to R1.

20. What is a supernet?

the network for a default route

a network that contains both private and public addresses

a set of discontiguous networks that are controlled by an ISP

a summarization of serveral IP classful networks into one IP address range

8/3/2019 Module 1 11

40/78

40



1.

Refer to the exhibit. If all routers are running RIP version 2, why is there no route for the 192.168.1.32/27

network?

Rip version 2 does not send subnet masks in its updates.

Router A is not setup with RIP as a routing protocol.

Rip version 2 will auto summarize routes by default.

Router B is not setup to advertise the 192.168.1.64/30 network.

2.

Refer to the exhibit. Which command on which router will allow Router1 to learn about the 192.168.0.0/20

network?

Router1(config)# ip classless

Router1(config-router)# no passive-interface serial 0/1/1

Router2(config-router)# version 2

Router2(config-router)# neighbor 10.0.0.2

3. What are two reasons to implement RIP version 2 rather than RIP version 1? (Choose two.)

RIP version 2 supports VLSM.

8/3/2019 Module 1 11

41/78

41

RIP version 2 supports more than 16 routers.

RIP version 2 supports classful (and not classless) routing

RIP version 2 supports routing update authentication.

RIP version 2 supports multi-areas.

RIP version 2 uses the Dijkstra algorithm rather than the Bellman-Ford algorithm

4. How are RIP v1 and RIP v2 similar to one another? (Choose three.)

They both use hop count as a metric.

They both have the same metric value for infinite distance.

They both use a broadcast IP address to send updates to their neighbors.

They both send subnet mask information in their updates.

They both provide for authentication of update sources.

They both use split horizon to prevent routing loops.

5.

Refer to the exhibit. Routers East and West are configured using RIPv1. Both routers are sending updates

about their directly connected routes. The East router can ping the West router serial interface and West can

ping the serial interface of East. However, neither router has dynamically learned routes from the other. What is

most likely the problem?

A gateway of last resort is required.

Subnetting is not supported by RIPv1.

VLSM is not supported by RIPv1.

One of the routers needs a clock rate on the serial interface.

8/3/2019 Module 1 11

42/78

42

6.

Refer to the exhibit. Which command will allow Router2 to learn about the 192.168.16.0/28 network?

Router1(config)# ip classless

Router1(config-router)# network 192.168.16.0

Router1(config-router)# no passive-interface serial 0/1/1

Router2(config-router)# version 2

Router2(config-router)# neighbor 10.0.0.2

7.

Refer to the exhibit. All routers are running RIP version 2. JAX is configured to just advertise the 10.0.0.0/24

network. CHI is configured to advertise the 172.16.0.0/16 network. A network administrator enters the

commands shown in the exhibit. What changes will occur in this network?

The JAX router will ignore updates for the 172.16.0.0/16 network due to split horizon issues.

The CHI router will install a route to the 192.168.0.0/16 network in its routing table.

The routing table for CHI will have the 192.168.0.0/16 route but it will have an S next to the route.

The ORL router will apply a 255.255.0.0 subnet mask to all networks in the routing updates it forwards.

8/3/2019 Module 1 11

43/78

43

8.

Refer to the exhibit. A technician needs to add a new loopback interface to test routing functionality and

network design. The technician enters the following set of commands on the router:

Sanford(config)# interface loopback1

Sanford(config-if)# ip address 192.168.6.62 255.255.255.252

Why does the router respond with an error?

The router does not allow loopback interface configurations.

This mask can not be used with this class of addresses.

Classless routing must be configured before this address can be added.

The network address for Loopback1 overlaps with an already configured interface address.

The router is over the limit for the maximum paths that can be provided in the routing table.

9. What is the maximum network diameter permitted by the default metric of RIPv2?

15 hops

16 hops

100 hops

120 hops

255 hops

10. What are two functions of the network command used when configuring routing protocols? (Choose two.)

identifies which networks will be included in the routing updates

identifies the hosts addresses that can be summarized in the network

used to list all addresses for remote and local networks

determines which subnet mask to apply to routing updates

determines which interfaces can send and receive routing updates

8/3/2019 Module 1 11

44/78

44

11.

Refer to the exhibit. What can be concluded from the output shown in the exhibit?

The routing table is limited to 2 routes.

The LAN interfaces are participating in the routing process.

One update has been sent out of each serial interface and 2 have been received.

The no auto-summary has not been configured on this router.

12. A network administrator has been told that the company IP address infrastructure must adhere to RFC 1918.

What three IP address ranges from RFC 1918 could the administrator use on the network? (Choose three.)

10.0.0.0/8

127.0.0.0/8

169.254.0.0/16

172.16.0.0/12

192.168.0.0/16

209.165.201.0/27

8/3/2019 Module 1 11

45/78

45

13.

Refer to the exhibit. All routers are running RIPv1. What changes will occur in the routing table of router B if a

loopback interface with an address of 10.16.1.129/27 is configured on router B?

Routes to the 10.16.1.0/27, 10.16.1.64/27, and 10.16.1.128/27 networks are added.

A connected route to the 10.16.1.128/27 network is added.

A third route to the 10.0.0.0/8 network with RIPv1 as the source is added.

The 10.0.0.0/8 route is dropped immediately from the routing table after router B is configured.

14. A network administrator installed four new routers that are running RIPv2. Router1 is a boundary router in the

RIPv2 network and has a default route configured. Once the network has converged, the network

administrator enters Router1(config-router)# default-information originate on Router1. How will this affect the

network?

prevents Router1 from forwarding updates about networks that are not directly connected

causes all routers in the network to synchronize routing updates with Router1

forces Router1 to become the primary or designated router (DR) for updates

propagates the default route to all routers in the network

8/3/2019 Module 1 11

46/78

46

15.

Refer to the exhibit. The exhibited network contains a mixture of Cisco and non-Cisco routers. The command

debug ip rip was entered on the JAX router. All routers are running the same version of RIP. Router CHI and

Router ORL are not able to reach the 192.168.1.16/28 network. What is a possible solution to this problem?

Enable split horizon in the network.

Configure RIPv2 on routers.

Add network 192.168.1.0 to the RIP configuration on the JAX router.

Configure JAX Fa0/0 as a passive interface.

Enable the Serial0/0/0 interface on the JAX router.

Change the IP address on the Fa0/0 interface of the JAX router to 192.168.1.1/24.

16. What field was added to the RIP message header by RFC 1723 to add support for VLSM and CIDR?

subnet mask

destination port number

address family identifier

source and destination IP addresses

17.

Refer to the exhibit. What effect will the commands that are shown have on RIP updates for Router1?

Only version 2 updates are sent to 255.255.255.255.

Only version 2 updates are sent to 224.0.0.9.

8/3/2019 Module 1 11

47/78

8/3/2019 Module 1 11

48/78

48



1.

Refer to the exhibit. What can be determined from this output?

The router will have to perform recursive lookups to forward a packet destined for 192.168.2.213/24.

The parent route for these networks was removed from the routing table.

A route to 192.168.0.0/25 would be classified as a supernet route for the routes listed in the routing

table.

All of the routes listed are network routes.

2.

Refer to the exhibit. A packet destined for host 128.107.0.5/16 is processed by the JAX router. After finding the

static route in the routing table that matches the destination network for this packet, what does the router do

next?

searches for a default route to forward the packet

drops the packet since the static route does not have an exit interface

performs a recursive lookup to find the exit interface used to forward the packet

sends a request to neighboring routers for the location of the 128.107.0.0 network

3.

8/3/2019 Module 1 11

49/78

49

Refer to the exhibit. What parent network will automatically be included in the routing table when the three

subnets are configured on Router1?

172.16.0.0/16

172.16.0.0/24

172.16.0.0/30172.16.1.0/16

172.16.1.0/24

4.

The following entry is displayed in the routing table:

R 192.168.8.0/24 [120/2] via 192.168.4.1, 00:00:26, Serial0/0/1

What type of route is this?

a level 1 parent route

a level 1 supernet route

a level 1 ultimate network route

a level 2 child route

a level 2 ultimate child route

5.

Refer to the exhibit. Router1 is running IOS version 12.2. What will the network administrator need to do so that

packets for unknown child routes of 172.16.0.0/24 will not be dropped?

issue the ip default-network command

use a classful routing protocol such as RIPv1

enable either OSPF or ISIS as the routing protocol

issue the ip classless command

do nothing, ip classless is on by default

8/3/2019 Module 1 11

50/78

50

6.

Refer to the exhibit. Router B receives a packet with a destination address of 10.16.1.97. What will router B

do?

drop the packet

use the default route

forward the packet via the route to 10.16.1.0

forward the packet via the route to 10.16.1.64

7.

Refer to the exhibit. How many routes in this output qualify for use as ultimate routes?

3

4

5

6

7

8

8/3/2019 Module 1 11

51/78

51

8.

Refer to the exhibit. With the ip classless command issued, what will router R2 do with a packet destined for

host 172.16.4.234?

drop the packet

send packet out Serial 0/0/1

send packet to network 0.0.0.0

send packet out FastEthernet 0/0

9.

Refer to the exhibit. Which statement correctly describes this network?

EIGRP is being used

There is at least one parent and one child route

192.168.2.0, 192.168.3.0, and 192.168.4.0 networks are child routes

Traffic going to 172.16.3.0 will be directed to s 0/0/1

8/3/2019 Module 1 11

52/78

52

10.

Refer to the exhibit. Router1 has been issued the ip classless command. What happens to packets destined

to host 172.16.3.10?

they are dropped

sent to default gateway

forward out interface Serial 0/0/1

forward out interface FastEthernet 0/0

11.

Refer to the exhibit. The network administrator has discovered that packets destined for servers on the

172.16.254.0 network are being dropped by Router2. What command should the administrator issue to

ensure that these packets are sent out the gateway of last resort, Serial 0/0/1?

ip classless

no ip classless

ip default-network 0.0.0.0

ip default-gateway 172.16.254.1

ip route 0.0.0.0 0.0.0.0 Serial 0/0/1

12. What determines if the router implements a classless route lookup process?

Child routes are present in the routing table.

The command ip classless is enabled on the router.

A classless routing protocol has been configured on the router.

Routing table entries have a next-hop IP address and an exit interface for each child route.

8/3/2019 Module 1 11

53/78

53

13. What occurs when no ip classless is implemented on the router?

The router will only support classful IP addressing.

The router will only support classful routing protocols.

The router will use a default route, if present, when a matching route is not found in the routing table.

The router will assume it has knowledge of all subnets in the network and will not search beyond child

routes for a better match.

14.

Refer to the exhibit. The graphic contains partial contents of the routing table on router E. Router E is running

version 12.3 of the IOS and is configured for default routing behavior. Router E receives a packet to forward.

Which route in the routing table will be searched first and why?

172.16.1.0/25 because it is the first ultimate route

0.0.0.0/0 because it is the lowest network number

172.16.0.0/25 because it is the first level 1 route

172.18.0.0/16 because it has the shortest mask

15. A network is converged and the routing tables are complete. When a packet needs to be forwarded, what is

the first criterion used to determine the best path in the routing table?

the route with the highest bandwidth

the route with the smallest Administrative Distance

the route with the longest address and mask match to the destination

the route with the best combination of Administrative Distance and lowest cost

8/3/2019 Module 1 11

54/78

54

16.

Refer to the exhibit. What subnet mask will Router1 apply to child routes of the 172.16.0.0/24 network?

0.0.0.0

255.255.0.0

255.255.255.0

255.255.255.255

17.

Refer to the exhibit. What protocol was used to distribute the routing information for the network 172.16.1.4?

RIPv1

RIPv2

EIGRP

OSPF

18. A route to a destination network is learned from multiple routing protocols. What is used by a Cisco router to

select the preferred route to the destination that will be installed in the routing table?

metric

route prefix

update timer

administrative distance

8/3/2019 Module 1 11

55/78

55



1. On a router running EIGRP, what database would maintain a list of feasible successors?routing table

neighbor table

topology table

adjacency table

2.

Refer to the exhibit. This is the debug output from 2 directly connected EIGRP routers. They are not forming an

adjacency. What is the cause?

one router is a non-cisco router

they have different autonomous-system numbers

they are using difference sequence numbers

they are sending incorrect hello types

3.

Refer to the exhibit. Which command will advertise the 192.168.1.64/30 network but not the 192.168.1.32

network on router A?

network 192.168.1.0

network 192.168.1.0 255.255.255.0

network 192.168.1.64 0.0.0.3

8/3/2019 Module 1 11

56/78

56

network 192.168.1.64 0.0.0.255

4. What two actions will the EIGRP DUAL FSM take if a link to a network goes down? (Choose two.)

put the route into passive mode

query neighbors for a new route

search routing table for a feasible successor

run the SPF algorithm to find a new successor

search topology table for a feasible successor

5.

Refer to the exhibit. What is indicated by the P at the beginning of the topology entry?

the route is in a stable state

the route is a preferred route

DUAL is searching for a better route to this destination

the exit interface is in passive mode and EIGRP advertisements are blocked

6. In which of the following tables does the EIGRP DUAL algorithm store the primary route to a destination?

(Choose two.)

routing

topology

neighbor

path

shortest path

7. What information is maintained in the EIGRP topology database for a destination route? (Choose two.)

the highest cost of the route

the SRTT value for the route

the feasible distance of the route

the physical address of the gateway interface

the route cost as advertised by the neighboring router

8/3/2019 Module 1 11

57/78

57

8. Which of the following statements describes the bounded updates used by EIGRP?

Bounded updates are sent to all routers within an autonomous system.

Partial updates are sent only to routers that need the information.

The updates are sent to all routers in the routing table.

Updates are bounded by the routers in the topology table.

9.

Host 192.168.1.66 in the network illustrated is unable to ping host 192.168.1.130. How must EIGRP be

configured to enable connectivity between the two hosts? (Choose two.)

R1(config-router)# network 192.168.1.128

R1(config-router)# auto-summary

R1(config-router)# no auto-summary

R2(config-router)# no auto-summary

R2(config-router)# auto-summary

R2(config-router)# network 192.168.1.64

10. Which two statements describe characteristics of EIGRP? (Choose two.)

EIGRP is a distance vector routing protocol.

EIGRP supports classless routing and VLSM.

EIGRP is classified as a link-state routing protocol.

EIGRP uses TCP for reliable delivery of EIGRP update packets.

With EIGRP, loop-free paths are achieved through the use of hold-down timers.

EIGRP sends a periodic update every 30 minutes.

8/3/2019 Module 1 11

58/78

58

11.

Refer to the exhibit. Based on the output of show ip eigrp neighbors, what are two possible problems with

adjacencies between Router1 and Router2? (Choose two.)

The routers are configured with different EIGRP process IDs.

Automatic summarization was disabled.The hello timer for R1 was altered.

The serial interfaces for both routers are in different networks.

No feasible successors were found.

12.

Refer to the exhibit. In the topology table, what do the numbers 3011840 and 3128695 represent?

the route metric that is applied to those EIGRP routes for this router

the trustworthiness of the routing information source

the composite of the hop count and bandwidth to that destination network

the total metric for that network as advertised by the EIGRP neighbor

8/3/2019 Module 1 11

59/78

59

13.

Refer to the exhibit. EIGRP is the only routing protocol enabled on this network. No static routes are

configured on this router. What can be concluded about network 198.18.1.0/24 from the exhibited output?

A route to network 198.18.1.0/24 is not listed in the routing table.

Packets that are destined for 198.18.1.0/24 will be forwarded to 198.18.10.6.

EIGRP will perform equal cost load balancing across two paths when forwarding packets to

198.18.1.0/24.

The router with interface 172.16.3.2 is a successor for network 198.18.1.0/24.

14.

Refer to the exhibit. All

interfaces have been configured with the bandwidths that are shown in the exhibit. Assuming that all routers

are using a default configuration of EIGRP as their routing protocol, what path will packets take from the

172.16.1.0/16 network to the 192.168.200.0/24 network?

A,B,E

A,C,E

A,D,E

Packets will load balance across the A,B,E and A,C,E paths.

8/3/2019 Module 1 11

60/78

60

Packets will load balance across the A,B,E and A,D,E paths.

Packets will load balance across the A,C,E and A,D,E paths.

15. By default, which two metrics are used by EIGRP to determine the best path between networks?

MTU

load

delay

bandwidth

reliability

16. Which term defines a collection of networks under the administrative control of a single entity that presents a

common routing policy to the Internet?

autonomous system

contiguous networks

process ID

BGP

17.

Refer to the exhibit. The company is using EIGRP with an autonomous system number of 10. Pings betweenhosts on networks that are connected to router A and those that are connected to router B are successful.

However, users on the 192.168.3.0 network are unable to reach users on the 192.168.1.32 network. What is

the most likely cause of this problem?

IP classless is enabled and is causing the packet to drop.

The command network 192.168.1.32 was not issued on router C.

The routers are not configured in the same EIGRP routing domain.

Automatic summarization of the networks is causing the subnetted routes to be dropped.

18. In the command router eigrp 20, what is the purpose of the number 20?

8/3/2019 Module 1 11

61/78

61

specifies the administrative distance for all EIGRP routes

identifies the autonomous system number this EIGRP process will advertise

determines what metric is added to all advertised routes

indicates the number of addresses in the EIGRP routing domain

19. The show ip eigrp topology command output on a router displays a successor route and a feasible successor

route to network 192.168.1.0/24. In order to reduce processor utilization, what does EIGRP do when the

primary route to this network fails?

The router sends query packets to all EIGRP neighbors for a better route to network 192.168.1.0/24.

The DUAL FSM immediately recomputes the algorithm to calculate the next backup route.

Packets that are destined for network 192.168.1.0/24 are sent out the default gateway instead.

The backup route to network 192.168.1.0/24 is installed in the routing table.

20. What administrative distance would a router assign to a default route in EIGRP that is learned from a source

external to the autonomous system?

1

5

70

90

170

190

21.

Refer to the exhibit. Network 192.168.0.0/28 goes down. What type of packet does Router2 immediately send

to Router1 and Router3?

a query for network 192.168.0.0/28

an acknowledgment packet to 224.0.0.9

an update packet that is sent to 255.255.255.255

a packet that contains the new routing table for R2

8/3/2019 Module 1 11

62/78

62

unicast update packets to 192.168.1.1 and 192.168.2.1

8/3/2019 Module 1 11

63/78

63



1.

Refer to the exhibit. When Router D is configured to use a link-state routing protocol and is added to the

network, what is the first thing that it does to begin learning the network topology?

It sends LSP packets to Routers B and C.

It sends LSP packets to all routers in the network.

It sends Hello packets to all routers in the network.

It sends information about its directly connected neighbors to Routers A and E.

It sends information about its directly connected neighbors to all routers in the network.

It learns about its directly connected networks when its interfaces reach the up state.

2. What two events will cause a link state router to send LSPs to all neighbors? (Choose two.)

30 second timer expires

whenever the network topology changes

immediately after the Bellman-Ford algorithm has run

immediately after the DUAL FSM has built the topology database

upon initial startup of router or routing protocol

3. What is the final step in the link state routing process?

successors are placed into the routing table

SPF computes best path to each destination network

LSPs are flooded to all neighbors to converge the network

DUAL algorithm is run to find best path to destination networks

4. What two statements correctly describe the link state routing process? (Choose two.)

all routers in the area have link state databases

each router in the area floods LSPs to all neighbors

LSPs use the reserved multicast address of 224.0.0.10 to reach neighbors

routing loops are prevented by running the Diffusing Update Algorithm (DUAL)

8/3/2019 Module 1 11

64/78

64

Reliable Transport Protocol (RTP) is the protocol used by for the delivery and reception of LSPs

5.

Refer to the exhibit. What kind of information would be seen in an LSP sent from router JAX to router ATL?hop count

uptime of the route

cost of the link

a list of all the routing protocols in use

6. What feature do modern link-state protocols provide to minimize processing and memory requirements?

splitting routing topologies into smaller areas

assigning lower process priorities to route calculations

using update timers to restrict routing updates

strict split horizon rules to reduce routing table entries

7. To achieve network convergence, what three steps does each link state router take? (Choose three.)

use automatic summarization to reduce the size of routing tables

build a Link State Packet (LSP) containing the state of each directly connected link

flood the LSP to all neighbors, who then store all LSPs received in a database

send hello packages at regular intervals to discover neighbors and establish adjacencies

construct a complete map of the topology and compute the best path to each destination network

use the DUAL FSM to select efficient, loop-free paths, and insert routes into the routing table

8. What speeds up convergence in a network using link-state routing?

updates triggered by network changes

updates sent at regular intervals

updates sent only to directly connected neighbors

updates that include complete routing tables

8/3/2019 Module 1 11

65/78

65

9. Why is it difficult for routing loops to occur in networks that use link-state routing?

Each router builds a simple view of the network based on hop count.

Routers flood the network with LSAs to discover routing loops.

Each router builds a complete and synchronized view of the network.

Routers use hold-down timers to prevent routing loops.

10. What are two advantages of using a link-state routing protocol instead of a distance vector routing protocol?

(Choose two.)

The topology database eliminates the need for a routing table.

Each router independently determines the route to each network.

Link-state protocols require less router processor power than distance vector protocols.

After the inital LSP flooding, they generally require less bandwidth to communicate changes in a

topology.

Frequent periodic updates are sent to minimize the number of incorrect routes in the topological

database.

11. Which algorithm is run by link-state routing protocols to calculate the shortest path to destination networks?

DUAL

Dijkstra

Bellman-Ford

Diffie-Hellman

12.

Refer to the exhibit. Which statement correctly describes the path traffic would take from the 10.0.0.0/24

network to the 192.168.1.0/24 network if a link-state routing protocol was in use?

BOS -> ATL because this path is the least hops

BOS -> ATL because this path is highest cost

BOS -> ORL -> JAX -> ATL because this path is the lowest cost

8/3/2019 Module 1 11

66/78

66

traffic would load balance across all links

13. Which database or table must be identical on all link-state routers within an area in order to construct an

accurate SPF tree?

routing table

adjacency table

link-state database

neighbor table

topology database

14. Which two routing protocols use Dijkstras shortest path first algorithm? (Choose two.)

RIPv1

RIPv2

IS-IS

BGP

EIGRP

OSPF

15. When are link-state packets sent to neighbors?every 30 seconds

every 180 seconds

after the holddown time expires

when a link goes up or down

when a routing loop occurs

16.

Refer to the exhibit. What does JAX do with link-state packets from ORL?

sends out its updated routing table to both ORL and BOS routers

sends out the individual link-state packets out the interface connected to BOS

8/3/2019 Module 1 11

67/78

67

queries BOS to see if it has a better route

only adds it to the local routing table and performs no other actions

17. A new network administrator is given the task of selecting an appropriate dynamic routing protocol for a

software development company. The company has over 100 routers, uses CIDR and VLSM, requires fast

convergence, and uses both Cisco and non-Cisco equipment. Which routing protocol is appropriate for this

company?

RIP version 2

IGRP

EIGRP

OSPF

BGP

18. What action does a link-state router take immediately upon receipt of an LSP from a neighboring router?

floods the LSP to neighbors

calculates the SPF algorithm

runs the Bellman-Ford algorithm

computes the best path to the destination network

19.

Refer to the exhibit. If all routers and interfaces are configured to use a link-state routing protocol, from which

routers will router D receive hello packets?

A and E

B and C

A, B, C, and E

C only

8/3/2019 Module 1 11

68/78

68



1.

Refer to the exhibit. What does the "O*E2" from the "O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34,

Serial0/0/1" line represent?

an internal type 2 OSPF route.

an external OSPF route at least two hops away.

an external OSPF route from two different sources.

an external OSPF route that will not increment in cost.

a default route.

The route was distributed into OSPF from a type 2 router.

2.

Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?

2

110

1786

1.544

3. What three parameters must be indentical between OSPF routers in order to form an adjacency? (Choose

three.)

area id

K-values

metric value

hello interval

network type

8/3/2019 Module 1 11

69/78

69

interface type

4. What does OSPF use to reduce the number of exchanges of routing information in networks where large

numbers of neighbors are present? (Choose two.)

root router

backup root router

domain router

backup domain router

designated router

backup designated router

5. What does OSPF use to calculate the cost to a destination network?

bandwidth

bandwidth and hop count

bandwidth and reliability

bandwidth, load, and reliablity

6. A fully converged five router OSPF network has been running successfully for several weeks. All configurations

have been saved and no static routes are used. If one router looses power and reboots, what information will

be in its routing table after the configuration file is loaded but before OSPF has converged?

All routes for the entire network will be present.

Directly connected networks that are operational will be in the routing table.

Because the SPF algorithm has not completed all calculations, no routes will be in the table.

A summary route for all previously learned routes will automatically appear in the routing table until all

LSPs have been received by the router.

8/3/2019 Module 1 11

70/78

70

7.

Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration statement or set ofstatements was entered for router B to generate the exhibited routing table?

B(config-router)# network 192.168.1.0 0.0.0.3 area 0





8.

Refer to the exhibit. Which network command or set of commands will cause OSPF to be enabled for any R1

interface connected to the exhibited subnets?

R1(config-router)# network 10.0.0.0 0.0.0.0 area 0



R1(config-router)# network 10.1.2.4 0.0.0.3 area 0R1(config-router)# network 10.1.0.0 0.0.0.255 area 0



9.

8/3/2019 Module 1 11

71/78

71

Refer to the exhibit. What does the 2? stand for in the router ospf 2 statement?

The number 2 is the autonomous system number.

The number 2 indicates the number of networks advertised by OSPF.

The number 2 identifies this particular instance of OSPF on this router.

The number 2 indicates the priority of the OSPF process on this router.

10.

Refer to the exhibit. All routers have been configured with the interface priorities that are shown. All routers

were restarted simultaneously. The results of the DR/BDR election are shown. What can be concluded about

this network?

Router C cannot win a DR election under any circumstances.

If the link for interface 192.168.1.4 goes down, router B will become the new DR.

The highest router ID was most likely determined via an OSPF router-id statement or statements.If a new router is added with a higher router ID than router D, it will become the DR.

11.

Refer to the exhibit. What configuration state

Documents

Module 1 11