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Exam 351-050: CCIE Wireless Written Beta Exam

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Question:1 You work as a network administrator for company A. Study the exhibit carefully. Intermittent outages are occurring in a WLAN environment on a large corporate campus. No rogue APs have been detected and Cisco Spectrum Expert is now being utilized to help discover the source of interference. Judging from this Cisco Spectrum Expert screen, which interference type will you suspect?

A. Bluetooth B. Wireless video camera C. DECT phone D. Microwave oven


Answer: A Question:2 Which statement accurately describes AP power as related to Cisco 7921 wireless IP phone deployment? A. AP power should be set to a value that ensures 15-20% overlap between cells. B. A 7921 wireless IP phone will roam to the AP with the most powerful signal prior to an outgoing call

only. C. AP power should be set to the maximum, in order to ensure good signal strength. D. A 7921 wireless IP phone will roam to the AP with the most powerful signal before or during an

outgoing call. Answer: A Question:3 The proper design of a VoWLAN network can be supported by which two guidelines?(Choose two.) A. In order to prevent multipathing, the distance between access points should not exceed the

heights of the rooms in which they are installed. B. For an ideal voice-ready wireless cell size, the radius or size of each cell should be -67 dBm. C. A VoWLAN network using 802.11a radio needs an access point approximately every 4 meters (13

feet). A VoWLAN network using 802.11b/g radio needs an access point approximately every 8 meters (26 feet).

D. If there are numerous clients in an area, or the supported data applications require significant bandwidth, capacity can be added to the network by using more access points on spectrally exclusive (in other words, non-overlapping) channels.


Answer: B, D Question:4 You are a network technician. Study the following exhibit carefully. A Cisco Aironet 1131 Access Point has failed and should be replaced. Both DHCP Option 43 and DNS discovery have not been used in this network. A replacement Aironet 1131 Access Point is retrieved from the spares inventory and plugged into the same Ethernet jack that the failed AP was using. The AP has been configured with the wrong IP address. Which step is the next in repairing the failed AP?

A. Create and apply a Cisco WCS migration template. B. Prime the AP with the correct controller IP address by placing it in the same VLAN as the Cisco WLC

management address. C. Connect a serial console cable to a laptop and correct the AP IP address. D. Clear the AP by holding down the reset button while rebooting.


Answer: A Question:5 Which statements are true about noise in an 802.11b/g environment (2.4-GHz)? A. Noise is defined as a 2.4-GHz signal that is not in an 802.11 DSSS format but is in the

frequency range of the access point's configured channel. B. Microwave Oven, Cordless Phones, Jammers C. Any signal that the access point cannot decode is considered noise. D. 802.11 2.4-GHz frequency-hopping radio

Answer: A, B, C, D Question:6 In the process of deploying a Cisco 7921G wireless IP phone within the Cisco Unified Wireless Network, which feature will be implemented between the phone and the access point to mitigate one-way audio? A. NMSP B. DTPC C. DCA and TPC D. AKM

Answer: B Question:7 Which statement correctly describes preambles? A. It may be necessary to configure an AP for long preambles, because some clients are not

capable of using short preambles. B. Support for short preambles is mandatory. C. It may be necessary to configure an AP for short preambles, because some clients do not

understand the additional information transmitted in long preambles. D. For maximum throughput for both types of cards, short preambles should be turned off when there

is a mixture of 802.11b and 802.11g clients.

Answer: A Question:8 What is the reason that interference is generally more of an issue at the receiver than the transmitter? A. Signal levels at the receiver are logarithmically less than signal levels at the transmitter. B. There are more receivers than transmitters. C. Signal levels at the transmitter are logarithmically less than signal levels at the receiver. D. It is unusual in wireless to receive and transmit at the same time, therefore the receiver can't

detect the interference.

Answer: A Question:9 Which feature should be provisioned on all controllers in order for Radio Resource Management to operate correctly amongst multiple controllers in which APs are able to hear each other? A. The same mobility group B. The same ASCII RF group name C. Layer 2 LWAPP only D. The same WEP Key


Answer: B Question:10 Which description is correct with regard to the operation of an access point in Rogue Location Discovery Protocol mode? A. The AP determines whether or not a rogue access point is on a trusted network. It does not

provide RF service of any kind, but rather receives periodic rogue access point reports from the controller, and sniffs all ARP packets. If it finds a match between an ARP request and a MAC address it receives from the controller, it generates a rogue access point alert to the controller.

B. The AP uses the existing wireless infrastructure in order to scan for rogue APs. Once discovered, these rogues are added to a local list that includes the rogues' BSSIDs, MAC addresses, and any discovered security provisions (WPA, WEP, etc.).

C. The AP moves to the rogue channel and attempts to connect to the rogue as a client. The AP then tries to obtain an IP address and forwards a UDP packet to the controller through the rogue. If the controller receives this packet, the network administrator is notified that a rogue AP has been discovered on the wired network.

D. The AP detects a rogue client, and then the network administrator is able to contain both the rogue AP and the rogue clients. This can be achieved because 802.11 deauthentication packets are sent to clients that are associated to rogue APs, so threats such as holes are mitigated.

Answer: C Question:11 How to differ EAP-TLS from Microsoft PEAP? A. EAP-TLS requires a client certificate. B. EAP-TLS does not require a certificate. C. Both EAP-TLS and Microsoft PEAP require client certificates but Microsoft PEAP is described in

RFC 2716. D. Microsoft PEAP is more secure.

Answer: A Question:12 You work as a network administrator. Your company has two WLCs correctly configured for redundancy. You used the default AP Fallback settings. Because of a power problem, the primary controller fails and then the secondary controller takes over operation of the LWAPP APs. Which action will be taken by the APs after restoring the power to the primary controller? A. The APs will automatically rejoin the primary WLC. Because WLC redundancy is stateful,

service to the APs will not be interrupted while they are rejoining the primary WLC. B. The APs will remain joined to the secondary WLC until the network administrator manually forces

them back to the primary WLC. During the process of forcing them back, service to the APs will be interrupted.

C. The APs will automatically rejoin the primary WLC. While the APs are rejoining the primary WLC, service to them will be interrupted.

D. The APs will remain joined to the secondary WLC and the configuration will be updated (the secondary WLC will become the primary WLC, and the primary the secondary).

Answer: C Question:13 Which four components are of CSMA/CA? A. Fragmentation, PCF, collision, backoff B. Carrier sense, DCF, acknowledgment frames, RTS/CTS medium reservation C. Fragmentation, PCF, acknowledgment frames, RTS/CTS medium reservation D. Carrier sense, collision, jam sequence, backoff

Answer: B Question:14 Observe the following error message carefully: Error Message DOT11-TKIP_MIC_FAILURE_REPEATED: Two TKIP Michael MIC failures were detected within [number] seconds on [interface] interface. The interface will be put on MIC failure hold state for next [number] seconds Which option is correct about this error message? A. Because MIC failures usually indicate an active attack on your network, the access point is throttled

and put on hold for the configured time. Access by new stations is restricted until the timer expires. B. Because MIC failures usually indicate an active attack on your network, the interface will be put on

hold for the configured time. During this hold time, stations using TKIP ciphers are disassociated and cannot reassociate until the hold time ends. Once the hold time ends, the interface will begin to operate normally again.

C. Because MIC failures usually indicate a passive attack on your network, the interface input queues are placed on hold for the configured time. During this hold time, all traffic is dropped until the hold timer expires. Once the hold time ends, the interface will begin to operate normally again.

D. Because MIC failures usually indicate a passive attack on your network, the interface MIB counter will be incremented. During hold time, stations using TKIP ciphers are still allowed to associate and establish authentication.

Answer: B Question:15 Which two items are the purposes of a pre-site survey walkthrough? (Choose two.) A. Identify potential problem areas B. Define intended coverage areas C. Determine the final location of APs and antennas D. Identify sources of RF signal attenuation and RF interference Answer: A, B Question:16 For the following statements, what are the key RF deployment guidelines for WLAN phones? A. VoWLAN handsets should use static WEP, since it provides the fastest roam times and the

security of VoWLAN calls is not a high priority. B. Follow standard WLAN site survey procedures to minimize cell overlap and interference. In

addition, ensure that the cell edge has a minimum power level of -67 dBm and an error rate less than 1%. The power level of the APs and the handset should match, and should also provide sufficient call capacity.

C. The RF deployment guidelines are the same as those for any other WLAN client: perform a site survey to ensure appropriate coverage for the required bit rate and minimize channel overlap.

D. Use patch antennas to provide higher gain and better coverage and use the highest power on the AP. This will ensure maximum coverage and minimize the number of dropped calls.

Answer: B Question:17 Your company has just completed constructing a new automobile parts manufacturing facility. The facility IT manager would like to implement voice over WLAN. During your initial walkthrough, you see numerous highly reflective surfaces on the manufacturing equipment and in the building construction itself. What potential problem exists that should be accounted for during your site survey? A. RF signal absorption B. Multipath distortion C. RF signal attenuation D. Fresnel zone impedance

Answer: B Question:18 Can you tell me which three of the following items are configurable settings on each SSID for the Cisco 802.11 Access Point High Speed WAN Interface Card? (Choose three.) A. Guest mode B. Quality of service C. Infrastructure SSID D. Maximum number of client associations

Answer: A, C, D Question:19 How to connect the new bridge to the old antenna while installing an outdoor bridge which is replacing another vendor's bridge?

A. FCC and ETSI regulations do not permit the connection of disparate systems without

certification. B. The 802.11 standard requires that all connectors be N-type connectors, so the bridge and

antenna will interoperate with no changes. C. The connectors are proprietary to the vendor, so using an adapter that is approved by the

vendor would be necessary. D. The connectors are proprietary to the vendor, so using an adapter available from either vendor would

be necessary, but no regulatory approval is required. Answer: A Question:20 Dynamic Host Configuration Protocol (DHCP) is a protocol used by networked devices (clients) to obtain the parameters necessary for operation in an Internet Protocol network. While using an enterprise DHCP server to facilitate WLAN controller discovery by both Cisco Aironet 1000 Series and 1250 Series Lightweight Access Points, which two DHCP options could be supported by the DHCP server? (Choose two.) A. Option 43 B. Option 48 C. Option 60 D. Option 82

Answer: A, C


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