Testing Network Cables
If your computer can’t communicate with any other computer on your LAN, and the Device Manager doesn’t indicate a faulty network card, you might have a wiring problem. Wiring problems can be the most difficult to solve because it’s difficult to prove that data is leaving one computer but not arriving at another. The ping program, discussed later in this chapter, can help with this problem.
To learn how you can use the ping command to diagnose Internet-related problems, as opposed to LAN problems, see “ping,” p. 361.
If your computer is not properly wired into the LAN or is connected through a wireless network, in many cases ...
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