Practice: Configure Windows Firewall in Visual Basic .NET

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Practice: Configure Windows Firewall
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In this practice, you will ensure that Windows Firewall is enabled on all connections on your computer. You will disable and then re-enable Windows Firewall on your LAN connection only. You will then enable an exception in Windows Firewall for all con nections. The practices in this exercise require that you have a properly configured LAN connection.
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Exercise 1: Ensure That Windows Firewall Is Enabled for All Network Connections
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1. Click Start, and then click Control Panel (in Category View). 2. In Control Panel, click Network And Internet Connections. 3. In the Network Connections window, right-click your LAN connection, and then click Properties. 4. In the Local Area Connection Properties dialog box, on the Advanced tab, in the Windows Firewall section, click Settings. 5. In the Windows Firewall dialog box, ensure that On (Recommended) is selected. Also ensure that the Don t Allow Exceptions check box is cleared. Leave both the Windows Firewall dialog box and the Local Area Connection Prop erties dialog box open for the next exercise.
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Exercise 2: Disable and Re-enable Windows Firewall on Your Local Area Connection Only
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1. In the Windows Firewall dialog box, click the Advanced tab. 2. In the Network Connection Settings section, in the list of connections, clear the check box next to Local Area Connection, and then click OK. Windows Firewall is now disabled for the local area connection. A bubble appears in the notification area informing you that your computer is at risk because the firewall is disabled. 3. In the Windows Firewall dialog box, on the Advanced tab, select the check box next to Local Area Connection, and then click OK.
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Lesson 3
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Supporting Windows Firewall
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10-51
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Windows Firewall is now enabled for the local area connection. Leave the Local Area Connection Properties dialog box open for the next exercise.
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Exercise 3: Enable an Exception in Windows Firewall for All Connections
1. In the Local Area Connection Properties dialog box, on the Advanced tab, in the Windows Firewall section, click Settings. 2. In the Windows Firewall dialog box, on the Exceptions tab, select the File And Printer Sharing check box. 3. Click OK. Windows Firewall is now configured to allow file and printer sharing traffic into your computer. 4. Click OK again to close the Local Area Connection Properties dialog box.
Lesson Review
Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. You are troubleshooting a network connection and need to use the Ping com mand to see if a computer is reachable. Which ICMP exception must you enable on that computer Choose the correct answer. A. Allow Incoming Router Request B. Allow Incoming Echo Request C. Allow Outgoing Source Quench D. Allow Redirect 2. By default, what two types of traffic does Windows Firewall allow into a computer
3. Windows Firewall protects a computer running Windows XP even while the com puter is starting up. (True/False)
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10
Supporting Network Connectivity
Lesson Summary
Windows Firewall is a software-based firewall that is included with Windows XP Service Pack 2. Windows Firewall blocks all incoming network traffic except for solicited traffic and excepted traffic. You can enable or disable Windows Firewall globally for all network connections on a computer, including LAN, dial-up, and wireless connections. You can also enable or disable Windows Firewall selectively for each network connection on a computer. Windows Firewall allows you to configure a number of advanced options, includ ing the following:
Enabling Windows Firewall logging to log network activity Creating an exception for a service or application to allow traffic through the firewall Creating a custom service definition when a built-in exception does not suit your needs Creating an ICMP exception so that the computer responds to traffic from cer tain network utilities
Troubleshooting Windows Firewall typically involves enabling or disabling Windows Firewall and creating exceptions so that specific network traffic is allowed into the computer.
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