Here is a list of Microsoft Knowledge Base Articles about networking.
How to Troubleshoot TCP/IP Connectivity with Windows XP
"Ipconfig" Command Reports IP Address 0.0.0.0
Troubleshooting Home Networking in Windows XP
How to troubleshoot wireless network connections in Windows XP Service Pack 2
You receive an error message when you join a domain with Windows XP
How to troubleshoot missing network connections icons in Windows Server 2003 and in Windows XP
How to gather information to troubleshoot a wireless connectivity problem in Windows XP
You see more Ethernet network adaptors than are actually installed in the Windows XP-based computer
Error Message When You Run the "Ipconfig /Renew" Command
You cannot view other workgroup computers on the network on a Windows XP-based computer
Network Map in Windows Vista does not display computers that are running Windows XP
How to troubleshoot network connectivity problems in Internet Explorer