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For more information about installing and troubleshooting hardware devices, see 9, Managing Devices. For more information about H.323, see the International Telecommunication Union link on the Web Resources page at http://www.microsoft.com/windows/reskits /webresources. For more information about SIP, see RFC 2543: SIP: Session Initiation Protocol. See the Internet Engineering Task Force (IETF) link on the Web Resources page at http://www.microsoft.com/windows/reskits/webresources.

In this part: 27: Understanding Troubleshooting . . . . . . . . . . . . . . . . . . . . . 1085 28: Troubleshooting Disks and File Systems . . . . . . . . . . . . . . . 1113 29: Troubleshooting the Startup Process . . . . . . . . . . . . . . . . . 1181

The most common example concerns a private local area network (LAN) and the public Internet. A firewall can be used between the two so that users on the private network can access the Internet, but Internet users cannot access the private network. In the following schematic illustration, the LAN can reach across the firewall to draw upon the Internet, but activity originating from the Internet cannot cross over the firewall and compromise the LAN s security.

This part helps you support computers that are running Microsoft Windows XP Professional. In addition to an introduction to developing troubleshooting strategies, it includes in-depth information to help you troubleshoot problems with disks and file systems and problems encountered during startup.

27

Firewalls can also be configured to prevent LAN users from accessing the Internet or to restrict TCP/IP traffic so that only certain ports can transmit across the firewall. Firewall solutions can be in the form of either hardware or software. Each has its own advantages and disadvantages, and staunch firewall enthusiasts might argue for one or the other. However, from a networking person s point of view, both hardware and software solutions can be very effective ways to protect your network. ICF is a softwarebased firewall solution.

Microsoft Windows XP Professional provides a comprehensive set of troubleshooting tools for diagnosing and resolving hardware and software problems. Using these tools effectively requires an understanding of basic troubleshooting concepts and strategies. In this chapter: Troubleshooting Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1085 Troubleshooting Concepts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1087 Troubleshooting Strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1097 Establishing a Troubleshooting Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1109 Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1111

For more information about enabling, disabling, and managing devices, see 9, Managing Devices. For more information about troubleshooting tools use and syntax, see Appendix C, Tools for Troubleshooting. For more information about troubleshooting Stop messages, see Common Stop Messages for Troubleshooting on the companion CD. For more information about system and performance monitoring, see Overview of Performance Monitoring in the Operations Guide of the Microsoft Windows 2000 Server Resource Kit.

Whether an issue stems from a hardware or software problem, you need a reliable troubleshooting plan. Guesswork and random solutions are unreliable and often unsuccessful. An effective troubleshooting plan starts with gathering information, observing symptoms, and doing research.