CSCU Module 07 Securing Network Connections.pdf

8/19/2019 CSCU Module 07 Securing Network Connections.pdf

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Securing Network Connections

Simplifying Security.

Module 7


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PlayStation Network Security Breach

Will Cost Sony Over $170 Million

The hacker or hackers that brought down Sony’s video game and

entertainment services has cost the company more than just customer

satisfaction. According to Sony’s official earnings forecast, the shutdown

of PlayStation Network and Qriocity will cost the game maker

approximately $170 million.

The attack, which occurred on April 20, resulted in the loss of crucial

customer information

from

millions

of

Sony

gamers

and

entertainment

customers. Sony has invested heavily in strengthening its networks before

recently reopening the service. In addition, the company is offering free

data security for its current customers and offering free games and other

rewards for those who remained through the outage.

“We’ve been fortifying our system security,” said Shuhei Yoshida,

president, worldwide studios, Sony Computer Entertainment last week.

“The past

three

weeks

have

been

the

longest

in

my

life

for

PlayStation.

We appreciate the support and patience our customers have shown.

We’re in the final phase of restorations and our target date to get

everything up is by the end of this month. A secure online environment is

our number one priority.”http://www.gamerlive.tv

May 23, 2011 9:45 AM PST


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Module Objectives

Home Network

Steps for Home Networking

Wireless Networks

Setting Up a Wireless Network

Common Threats to Wireless

Network

Securing Wireless Network

Using the Network with Windows 7

Using the Network with MAC OS X

Network Security Threats

Securing Network Connections

General Security Practices in Home

Networking

Network Adapters

Troubleshooting with Network

AdaptersNetwork Security Checklist


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Home and Wireless

Networks

Wireless Network

Security

Using the Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow

Setting Up a Wireless

Network


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Home Network

DSL/Cable

Modem

Gaming Device

RouterPrinter

Personal Computer

Internet

Laptop

A home network allows the computers to

communicate with one another

If the

user

has

two or

more

computers at

home, a network can let them share:

Files and documents

An Internet connection

Printers and

scanners

Stereos, TVs, and game systems

DVD/CD burners

Simple Home Network


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Network Devices

Cable

Used to connect one network

device to other

Gateway

Any device that connects different network environments

Transceiver

Network device that has both

transmitter and receiver

Access Point

Wireless communications hardware

that creates a central point of

wireless connectivity

Terminals

Hardware devices used to enter data into

a computer

or

to

display

data

from

the

computer

Router

Devices that can connect several network devices

Modems

Used to change digital data into analog

to be

transmitted

across

an

analog

network medium and then back to digital at the receiving end

Network adapter/interface card

Used to physically connect a computer

to a network

Hub/SwitchUsed to connect all segments of a

network

Converter

Used to connect several types of

cables within an existing network


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Steps for Home Networking

Note down all the computers and

hardware Purchase the required hardware

Check for network interface card on

each computer; if not available, fix

them

Ensure that computers and all other

network devices are connected using

cables

Select one computer as host and connect it to the Internet

Connect the rest of the computers to the host using switch/router

Install network adapters through a

network setup wizard on all the

computers

Restart all the computers and start

sharing the files and accessing the

Internet


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Wireless Networks

DSL/Cable Modem

Ethernet Cable

Internet

WiFi Network

Wireless networks are used to connect the

computers to each other without any cables

They have become popular due to ease of

installation and the increasing popularity of

laptops

Restaurants, hotels, business centers,

apartment complexes, and individuals often

provide wireless access with little or no

protection

Service Set Identifier (SSID) is the name of the

network

All devices on the wireless network must use

the same SSID to communicate with each other

WiFi Router

Laptop with

External

WiFi

Card

Laptop with Internal WiFi Card

Desktop PC with

Ethernet Adapter


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Home and

Wireless

Networks

Setting Up

a

Wireless

Network

Wireless

Network

Security

Using the

Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow


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Setting Up a Wireless Network in Windows 7

To set up a wireless network in Windows 7, you should have Wireless Router, Wireless

Adapter, and an Internet connection

In the Start search box, type Network and select Network and Sharing Center

Click Set up a new connection or network

Click Set

up

a new

network and

click

Next


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Changing Wireless Networking

Configuration in Windows 7Select Manage Wireless Network from Network and Sharing Center

Click Add if you are asked How do you want to add a Network?Select Manually create a network

profile


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Complete the following information for the wireless network you want

to add

Check the options Start this connection automatically and Connect

even if the network is not broadcasting Click Next

Select Change connection settings

Uncheck the

option

Connect

to

a more

preferred

network

if

available

in Connection tab

Select the Security tab, next to Microsoft Protected EAP (PEAP) Click

Settings


Configuration in Windows 7


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Protected EAP Properties pops‐up check the option to

Validate server certificate

In Trusted Root Certification Authorities: check Class 3

Public Primary Certification Authority

In Select Authentication

Method:, select

Secured

Password

(EPA‐MSCHAP v2) Click Configure button

Uncheck Automatically use my Windows logon name

password (and domain if any) Click OK to dismiss each of

the open windows

A balloon will appear near the system tray that reads,

Additional information

is

required

to

connect

to

name

which you have provided Click Balloon

Enter your NETID and password, after validating, another

balloon appears at system tray as Additional information is

required to connect

Click the balloon Click OK to agree and validate the

Server Certificate

After a few minutes you will connected to your wireless

network


Configuration in Windows 7


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Setting Up a Wireless Network in

Mac

Click Network Pane in system preferences

and choose AirPort entry

Enable the

Show

AirPort

Status

in

Menu

Bar check box

Close the system preferences

Click the AirPort status icon in the menu

bar

Click create

network,

enter

a name

for

your network

Mark the required password check box

Enter a password for your network and

then enter it again to confirm it

Click

OK


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Configuration in MacGo to the upper right Airport icon

Select the UConnect option from the drop down menu

Enter User Name and Password fields, select

Automatic for 802.1x, and Check Remember this

Network

click

OKAccept the certificate verification by clicking on

Continue

Note: You should connect to UConnect shortly. If this

does not happen, check your profile.

Go to System Preferences and click Network

Verify that you are connected

Select Airport to the left and click Advanced

Click on the 802.1X tab and select the WPA: UConnect

profile

Verify that PEAP is the only Protocol checked.

Select the Configure Trust button

Select the Servers tab Click on the "+“. Select one of

the available

server

and

click

OK

Hit OK twice and click Apply


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Home and

Wireless

Networks

Setting Up

a

Wireless

Network

Wireless

Network

Security

Using the

Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow


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Common Threats to Wireless Network Eavesdropping

Attackers can use a variety of tools to find wireless access

points where they can pick up an SSID broadcast

Data interception and modification

Attackers who gain access to a network can insert a rogue

computer to intercept, modify, and relay communications

between

two

legitimate

parties Denial of service

Attackers can shut down access points by jamming air

with noise, rerouting connections to dead ends, or

disconnecting valid clients

Spoofing

Even if the

user

disables

broadcasting

or

turns

on

Media

Access Control (MAC) filtering on the wireless access

point, attackers can use antennas to capture user’s signal,

determine SSID or valid MAC address, and then use it to

impersonate an authorized client

Freeloading

An attacker can use the network as a free access point to

the Internet

Rogue WLANs

Attackers can install unauthorized WLANs on the network

with ease

Using wireless

networks,

an

attacker

can:

Read the email and instant messages as they travel across

the network

Monitor the websites that the user visits

Copy the usernames and passwords

View files on the computers and spread malware

Disclose users’ confidential information

Interrupt the wireless service

Implement

unauthorized

WLAN

Send spam or perform illegal activities with the user’s

Internet connection

Slow down the Internet performance


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Securing Wireless Network

Verify that access points are configured to use the closest primary IAS server

Turn off the network during extended periods of nonuse

Revisit the WLAN network design for incorrect access point placement

Do not

connect

to

unprotected

wireless

networks

at

public

places

Change the default SSID

Change the default administrator passwords (and usernames)

Performance monitoring helps in identifying heavily loaded IAS servers

Disable or turn off SSID broadcast for the network as it makes the network invisible to the attackers


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Enable MAC Address filtering to keep track of all network MAC devices connecting to

the router

Network level denial of service attacks are prevented by using user authentication

Data transmitting over wireless networks should be encrypted to prevent eavesdropping,

interception, and data modification

Unauthenticated access to the wireless network can be prevented by using VPN

connection and IPSEC

VPNs keep the communications safe by creating secure tunnels through which the

encrypted data travels

A network should be scanned using software scanning tools to locate and shut down

rogue WLANs

If the user is connected to an unprotected wireless network at public places, do not visit a

website that requires a password unless the website is encrypted

Securing Wireless Networks

1

2

3

4

5

6

7


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Home and

Wireless

Networks

Setting Up

a

Wireless

Network

Wireless

Network

Security

Using the

Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow


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Setting Up the PC’s Name and Workgroup

Name in Windows 7Go to Start Control Panel and click the System icon

Click on Change Settings

In the System Properties dialog box, click the Computer Name tab

Click the Change button

Give the computer a new name and a new workgroup name

Click OK to save your changes


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Sharing is used to share files and printers in a

network

It allows multiple users to access a file/folder by

enabling them

to:

Read

Modify

Copy

Print

Attackers who can access a single computer in a

network can also steal information from other

computers in the network

Note: Share only necessary files and folders

instead of the whole drive

Types of file sharing:

Default share

Does not

provide

security

Requires no configuration

Requires share designation

Restricted share

Provides security by limiting the number of users

accessing the share at a particular time

Designates specific users to access the share

Allots permissions

to

control

user

activity

on

the

share (offline/online)

Sharing


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Transferring Files

Transferring files through email and messengers (Yahoo and MSN)

Transferring files using FTP, Telnet, and web folders

Transferring files through peer‐to‐peer networks

Scan for viruses using the email virus scanner

Enter a valid user name and password for authorized access

P2P applications are configured such that all members of the network can

access

each

other’s

hard

drives

and

folders

by

defaultThis setting must be disabled if possible


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Simple File Sharing in Windows 7

Note: Do not enable this simple file sharing when your computer is connected to a public network

Confirm that you have enabled file and printer sharing on the network card

Go to Start Control Panel Network and Sharing Center

Click on change adapter settings

The network Connections window will appear. Right click on the network adapter (can be a

wireless adapter

or

wired

Ethernet

adapter)

in

use

and

click

Properties

The network card’s properties window will appear, then tick File and Printer Sharing for

Microsoft Networks and finally click OK


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Select the appropriate network location type before enabling

file sharing, mostly home network or work network type

Click on

Change

advanced

sharing

settings

Locate your current set profile (home or network), and turn

on/off the following settings

Turn on file and printer sharing

Turn off password protected sharing

Click on

Save

changes



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1. Right click the file or folder you plan to

share, select Share with and click on

Specific people....

2. The File Sharing window will appear.

Select or type the names of the people you

would like

to

share

the

file/folder

with

and

click Add. Set the permission level and

click Share

3. The next window will tell you that your

file/folder is shared, click Done to close

the window

4. Right click

the

shared

folder

and

click

Properties. Then go to the Sharing tab to

display the shared folder

5. Click on the Security tab. Check the group

or user names that are allowed to access

the file/folder, and ensure the user/group

that you

allowed

to

access

during

sharing

process is listed here as well


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Hiding a Shared Disk or Folder

Go to

My

Computer

Organize Folder

and

search

Options

To hide the empty drives, known file type extensions, and protected

OS files, check the respective options

To Show hidden files, folders, and drives, enable the show hidden

files, folders, and drives option

To not

show

hidden

files,

folders,

and

drives,

enable

the

Don't

show

hidden files, folders or drives option


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How to Share Printer in Windows 7? Go

to

Start Devices

and

Printers

Right click the printer to be shared, then click on the

Properties

Select the Sharing tab and check Share this printer to

share the printer

Type in a new name in the Share name text box to

change the

printer

name

on

the

network;

however,

this will not change the printer name on the computer

Click Apply

If the other users using a different version of Windows

want to access the printer, then they need to install a

printer driver themselves

Click Additional Drivers, check the additional driver to

be installed

User will

be

prompted

to

install

those

additional

drivers

after clicking OK


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Using Printers on Other PC’s

Go to Start Devices and Printers

Double click the selective printer or click on Add a Printer

to browse for it

Select

a

printer

from

the

list

displayed

and

click

on NextNow Windows will try to connect to the printer of choice

Install the software for the printer when prompted


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Accessing Files on Other PCs

Assign a letter to a particular shared disk or folder on

the network

Click My computerMap Network Drive

Using

the

drop‐

down

list,

choose

a

drive

letter

Indicate which folder or disk you want this letter to

represent

To make this letter assignment "stick," turn on

Reconnect at logon

Click Finish


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Windows Easy Transfer

Windows Easy Transfer helps the user to

transfer personal files, email, data, files,

media, and settings from the old computer

to the new one

Programs (applications) cannot be

transferred

It transfers:

User accounts

Files and folders

Program data files and settings

Email messages, settings, and contacts

Photos, music, and videos

Windows settings and Internet settings

Windows Easy Transfer provides a number

of ways for the user to connect two

computers to transfer the data

These include:

Easy Transfer Cable is a special USB cable designed to

work with Windows Vista and Windows Easy Transfer

If the user already has a wired or wireless network,

this is a great way to transfer all of the data

It can

copy

the

data

to

removable

hard

disk

and

then

copy data from that disk to new computer

It can use a computer's CD or DVD burner to transfer

user data


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Home and

Wireless

Networks

Setting Up

a

Wireless

Network

Wireless

Network

Security

Using the

Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow


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Setting Up the PC’s Name in MAC OS X

Go to Apple menu System Preferences

From the Internet & Network section of the System Preferences window, select the Sharing

option

At the top of the File Sharing dialog box, in the Computer Name box, type the new name for

your Mac

Close the

File

Sharing

dialog

box


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Open System Preferences from the

Apple menu

Open the Network icon in the

Internet & Network area

Select the network connection you

use to connect to the Windows

network

Click the Advanced button and then

click the

WINS tab

Type the name of the workgroup in

the Workgroup field

Click OK to save the changes

Restart your computer to join the

workgroup that

you

have

specified

Setting Up the Workgroup Name

in MAC OS X


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Creating User Accounts and

Groups in MAC OS X

Open System Preferences and click

Accounts Icon

Click New

User

button

Select the access level for this user from

the New Account pop‐up menu

Enter the name in the both name text

fields

Type the

password for

the

new

account

Re‐enter the password for confirmation

Select the Turn‐On File Vault protection

check box (optional)

Click Create Account to finish create

the account


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Editing an Account:

Go to System Preferences Accounts and

select the account you want to change

Deleting an

Account:

Choose the Apple icon System

Preferences

Click the Accounts icon, select the account

name to delete, and then click the minus‐

sign

button

beneath

the

list

Now Mac asks what to do with all of the

dearly departed's files and settings:

If you click the Delete Immediately button

the documents are gone forever

On the other hand, if you click OK, it

preserves the deleted folders on the Mac in a tidy digital envelope

The Guest Account:

Launch System Preferences, either by clicking

the System Preferences icon in the Dock, or

by selecting 'System Preferences' from the

Apple menu

Click the Accounts icon, located in the System

area of the System Preferences window

Click the lock icon in the bottom left corner.

When prompted, supply your administrator

username and password

From the

list

of

accounts,

select

Guest

Account

Place a check mark next to Allow guests to

connect to shared folders

Click the lock icon in the bottom left corner

Creating User Accounts and

Groups in MAC OS X


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Creating User

Accounts and Groups

in MAC OS X

Editing an User Account

Deleting an User Account

Guest Account


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Sharing Files and Folders in Macintosh OS X

Go to Apple menu System Preferences to open the

system preferences program

Click the Sharing icon

In the list of checkboxes, turn on Personal File Sharing

Permissions control

in

Mac

OS

X:

When connected to a remote Mac:

An Administrator account holder sees the names of

each drive on the remote Mac as well as his Home

folder. By opening up a Mac's hard drive, administrators

can view

all

the

Home

folders

on

that

Mac

A Standard account holder sees only the names of all

the Home folders on the remote Mac and has free

access only to his own Home folder. In all the other

Home folders, he can access only the Public folder

A Guest account holder sees only the names of all

Home folders

on

the

remote

Mac.

In

each

Home

folder,

all he sees is the Public folder

Changing access permissions for a file or folder

Choose File Get Info. When the Info dialog box appears,

expand the Ownership & Permissions panel; then expand

the Details section

This displays three pop up menus‐ Owner, Group and

Others

For example, click on the Owner drop down list and specify

the access permission (read only, write only, read and

write, or no access)

Finally click on the Apply button


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Printer Sharing in Macintosh OS X

Click Sharing from the system

Preferences window

Check the Printer Sharing option to

enable it

Click Print &

Fax

Icon in

the

System Preferences window

Click Add (+) button

Click Default button from the

browser window

Click Shared

Printer

you

wanted

to

use and then click the Add button

A i Oth M Y


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Accessing Other Macs on Your

NetworkClick on Go and Connect to Server in Snow Leopard menu

Enter the IP address of the server

Click Connect


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Network Security Threats

Malware:

Email, instant messaging, and file sharing programs have

traditionally been used to spread viruses, worms, backdoors,

rootkits, Trojans, and spyware from computer to computer

Sniffing:

Unsecured network connections such as WiFi access points are

used by hackers to set up packet sniffers to monitor all traffic

that comes and goes to a network

Denial of Service:

Denial of service causes the computer to crash or to become

so busy processing data that you cannot use it

Mobile code (Java, JavaScript, and ActiveX):

Intruders use mobile code to gather information such as the

websites visited or to run malicious code on your computer

Email spoofing:

An email message appears to have originated from one source

when it actually was sent from another source to trick the user

to expose

sensitive

information

Chat clients:

Chat clients allow the exchange of executable code that may

be malicious

Being an intermediary for another attack:

Intruders use

compromised

computers

as

launching

pads

for

attacking other systems

Back door and remote administration programs:

BackOrifice, Netbus, and SubSeven are the tools commonly

used by intruders to attack Windows computers

Cross‐site scripting:

A malicious web developer may attach a script to something

sent to a website, such as a URL that is transferred to your

browser when the website responds to you

Unprotected Windows shares:

Unprotected Windows networking shares can be exploited by

intruders

to

place

distributed

attack

tools

of

Windows‐

based

computers attached to the Internet


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Home and

Wireless

Networks

Setting Up

a Wireless

Network

Wireless Network

Security

Using the

Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow


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Use Firewall

A firewall is a part of the computer

system/network that is designed to block

unauthorized access

It controls

traffic coming

into

and

leaving

the system by permitting authorized

communications

It hides the user’s home network from

the outside world

It can

be

either

a hardware

or

software

Personal firewalls are recommended

on all computers

It monitors all the requests coming into the

system, alerts

the

user,

and

asks

permission

for allowing/blocking them

Examples of software firewalls:

Windows Firewall (check Securing

Operating Systems module)

Norton Personal

Firewall

McAfee Personal Firewall

Sunbelt Personal Firewall

ZoneAlarm

Comodo Personal Firewall

NetworkInternet Firewall

= Specified

traffic

allowed

= Restricted unknown traffic


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Use Antivirus Protection

Antivirus software is used to prevent, detect, and

remove malware, including computer viruses, worms,

and trojan horses

They offer "real‐time" protection for files and emails

as they are received

Anti‐Virus should be used at the server

It should be configured to scan:

All the workstations

Complete network regularly

All incoming and outgoing traffic

Email attachments

Downloads

Browsing

Anti Virus:


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• Password must be something that a

user can remember but is not

related to the user (such as date of

birth, maiden

name,

spouse

name,

etc.)

• A strong password is 8 – 10 digits

long with letters, numbers, and

characters (special characters can be

used, but the password should be

easy to remember)

• Use a strong password for accessing

all the resources

• Encryption is the conversion of data

into an unreadable form called

cipher text; Unencrypted data is

called plain

text

• It protects the sensitive information

that is transmitted online

• It is the effective way to achieve

data security

• Web browsers will encrypt text

automatically when

connected

to

a secure server

1 32

Use Strong

Passwords

Make Regular

Backups

Know about

Encryption

• Back up the data regularly; it helps

to restore data during security

issues

• Back up the settings and

configurations of the router and

firewall

• Create a boot disk before a security

event occurs; it helps in recovering

the system when it is damaged or

compromised

• For more details on how to backup

data, see: Data Backup and Disaster

Recovery module

Id tif S W b it


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Identify a Secure Website

Secured websites can be identified if:

The URL contains https://

The lock is present at the bottom right hand side of the browser

General Security Practices for Home


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General Security Practices for Home

Networking

Turning off Java, JavaScript, and ActiveX will

prevent the

user

from

being

vulnerable

to

malicious scripts (refer Internet Security

module)

Use antivirus software on all systems

Use a personal firewall software package

Keep all

the

applications

including

the

operating system patched

The Windows operating system contains an

option to "Hide file extensions for known

file types”; disable this option in order to

have file extensions displayed by Windows

Make regular backups of critical data

Never run a program unless the

sender/company is a trusted source

Make a boot

disk

to

recover

the

system

when it is damaged or compromised

Do not open the email attachments coming

from an unknown sender and disable

scripting features in email programs

Turn off the system or disconnect its

Ethernet interface when not in use


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Home and

Wireless

Networks

Setting Up

a Wireless

Network

Wireless Network

Security

Using the

Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow

Checking Network Adapter


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Checking Network Adapter

Go to Start Control Panel Network and Sharing Center

Click Network and Sharing Center. Microsoft Windows 7 displays your basic

Network connections

Click Change Adapter Settings

Network Setup Wizard


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Go to Start Control Panel Network

and Sharing center Set up a new

connection or network Connect to

the Internet Next

Click Set up a new connection anyway

click Next

Select the connection type in the How do

you want to connect wizard and click

Next

Enter User Name, Password, and

Internet Service

Provider (ISP)

Type the connection name and check

Allow other people to use this

connection, Click Connect



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If connected successfully, the window will display The connection to the Internet is ready to use

click Close

Click Yes to restart the computer

How to Isolate Networking Problems


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o o so e e o g o e s

( Windows 7): Network Adapter?

Go to Start Control Panel

Click Network and Sharing Center

Click Change Adapter Settings

In the

Network

Connections

Window,

examine the status of the network adapter

Network Adapter Status


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Home and

Wireless

Networks

Setting Up

a Wireless

Network

Wireless Network

Security

Using the

Network with

Windows 7

Using the

Network with

MAC OS X

Securing

Network

Connections

Network

Adapters

Troubleshooting

with Network

Adapters

Module Flow

Network Adapter is Unplugged


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Network Adapter is Unplugged

Verify that both ends of the network cable are properly connected

If the

cable

is

properly

connected,

verify

that

the

modem

and

router are plugged in and turned on

If the user has more than one network port available in the router, plug

the cable into a different port. If the network connection works, then the

original port on the router is faulty

Replace the network cable with a new cable. You might have a

faulty network cable

The network

adapter

on

the

system

might

have

failed

Network Adapter Has Limited or No Connectivity


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p y

Unplug the modem

If

the user

is

unsure

which

device

might

be the modem, it is the device that is

connected directly to the phone line (if

the user has DSL) or cable connection

If the user has a router connected to the

modem, it should be unplugged and

then plugged in after some time

Restart the system

If the network adapter still shows

"Limited or no connectivity" and the user

has customized the router's configuration,

verify that the router has DHCP (Dynamic

Host Configuration Protocol) enabled

Enable DHCP and then restart the system

If the problem persists, contact the

Internet service provider (ISP) for

support

When there is limited or no connectivity,

it may

be

due

to:

Failed Internet connection

Misconfigured router

Misconfigured network adapter

In the Network Connections

window, right‐click the

Network Adapter, and

then click Repair

If the user is using a

router, unplug the

network cable that

connects the modem

to the router and connect the computer

directly to the modem. Now, restart the

computer. If the computer connects

properly after

restarting,

the

problem

is with the router

Network Adapter is Connected, but User


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Cannot Reach the Internet

1

2

3

4

5

If the router is connected to the modem, unplug it and reconnect it

after a minute

Restart the computer

Unplug the modem, wait a minute, and then plug the modem back in

If the

user

has

configured

the

system

previously

with

a static

IP

address, he/she probably may need an automatic IP address at home

First check whether or not Internet is accessible; check for some

websites such as www.microsoft.com, www.eccouncil.org

Module Summary


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Module Summary

A firewall is a part of a computer system or network that is designed to block

unauthorized access

A router acts as a shield to the network and manages all communication

Wireless networks are used to connect the computers to each other without any cables

Eavesdropping, data interception and modification, denial of service, spoofing, freeloading,

rogue WLANs are the common threats to the wireless network

Windows Easy Transfer helps in transferring personal files, email, data, files, media, and

settings from

an

old

computer

to

a new

one

Sniffing, malware, email spoofing, chat clients, cross‐site scripting, unprotected Windows

shares, mobile code are some of the network security threats

Secure network connections using firewall, anti‐virus, using strong passwords, regular

backups, encryption etc.

Network Security Checklist


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Network Security Checklist

Change network device passwords regularly

Regularly update

the

operating

system

and

other

software

with

the

latest

patches

Block all access to the network infrastructure from the outside

Schedule regular backups of the data files

Run performance monitoring software to receive alerts if something abnormal

happens on the servers or the network

Install antivirus software on all workstations

Configure servers to scan both incoming and outgoing files

Scan all

incoming

and

outgoing

email

and

attachments

Documents

CSCU Module 07 Securing Network Connections.pdf