java code to read barcode image Lab Exercise 2203: Windows Firewall 433 in Software

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Lab Exercise 2203: Windows Firewall 433
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e) In the Completing the New Connection Wizard window, click on Learn more about broadband connections Record some of the pertinent information related to your installation f) Click the Finish button If you have followed the steps (and actually have installed a DSL or cable interface), you should now have high-speed access to the Internet
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Lab Exercise 2203: Windows Firewall
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Your client is very pleased with how the rollout of the office s Internet connection upgrade is progressing They have been sur ng around a little, and are impressed with the speed at which the Web sites are loading You explain that you must now con gure a rewall to protect them from outside intrusion through the high-speed connection Microsoft s Windows XP Service Pack 2 offers a very competent builtin rewall In this lab you will enable Windows Firewall and explore some of the services (ports) that you can allow or block
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Learning Objectives
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Completing the following steps, you will explore the Windows Firewall and associated TCP and UDP service ports At the end of this lab, you ll be able to
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Enable the Windows Firewall Identify various protocols and associated service ports
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Cross-Reference
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To further explore the Windows Firewall, refer to The Windows XP Internet Connection Firewall in 22 of Mike Meyers A+ Guide to Managing and Troubleshooting PCs
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Lab Materials and Setup
The materials you need for this lab are
A working computer running Windows XP Optionally, a machine actually connected to the Internet
434 22: The Internet
Getting Down to Business
Enabling the rewall is as simple as a few clicks of the mouse and verifying that you can communicate with the trusted sites that you prefer Windows Firewall is practically self-con guring, but if you want to allow access to Web servers or e-mail servers in your organization, you will have to open some TCP ports The CompTIA A+ Certi cation exams will expect you to know some of these well-known-ports, so you ll explore them in the Windows Firewall
Hint
If you are con guring a single machine for Internet access, you will want to implement the Windows Firewall on that machine to protect it from malicious intrusion However, if you are con guring machines as part of a local area network, and using a proxy server or Internet Connection Sharing (as you will in the next lab exercise), you will only want to con gure a rewall on the machine that connects directly to the Internet Assume the computer in this lab is the machine connected to the Internet
Step 1 Open the Local Area Connection Properties dialog box by clicking Start | Settings | Network Connections Right-click the Local Area Connections icon of the external connection (the one connected to the Internet), then select Properties from the drop-down menu Click the Advanced tab, then click the Settings button in the Windows Firewall area to open the Windows Firewall dialog box (see Figure 22-6) Step 2 Select On to protect the PC from unwanted access through the Internet connection
Figure 22-6 The Windows Firewall properties screen
Lab Exercise 2203: Windows Firewall 435
Figure 22-7 The Windows Firewall Advanced properties screen
Step 3 Now select the Advanced tab of the Windows Firewall dialog box and select the Settings button for the Network Connection Settings (see Figure 22-7) Step 4 This opens the Advanced Settings dialog box, where you can allow various services to pass through the Internet connection and access dedicated servers on your internal network For instance, if you have an FTP server that you have technicians update from the eld, you will want to enable external communication by allowing TCP service port 21 to pass through the rewall (see Figure 22-8)
Figure 22-8 Allowing FTP traffic to pass through the rewall
436 22: The Internet
Figure 22-9 Service Settings showing the TCP port number for the FTP server
Using the Edit button, identify the service ports for the following protocols (Figure 22-9 shows the port information I used to complete the rst answer for you) 1 File Transfer Protocol (FTP Server) TCP Port 21
2 Internet Mail Access Protocol Version 4 (IMAP4) ________________ 3 Simple Mail Transfer Protocol (SMTP) _________________________ 4 Post-Office Protocol Version 3 (POP3) _________________________ 5 Secure Socket Layer (HTTPS) ________________________________ 6 Hypertext Transfer Protocol (HTTP) __________________________ Step 5 To complete this lab, check with your instructor to obtain the proper con guration of the rewall to allow the completion of further labs You will probably disable the Internet Connection Firewall for normal classroom use
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