Physical Connection Failures
Doctrine has it that more than 50% of the world's network problems have nothing whatsoever to do with software configuration. I personally would be inclined to say that's a little high, but 25% would probably be fair. Here are some of the things you may encounter.
Common Problems
Loose connection. You don't see it so much with UTP, but some of those old coaxial cable connections were pretty shaky. The first and easiest thing to check when you have a network problem is that all of your connections are tight.
Bad cable. Cables are the most exposed portion of your network. They get kicked, stepped on, tripped over, and even chewed.
Bad port. Once you're sure of your connection and your cable, try plugging into a different ...
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