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Thats the quick-and-dirty test... it'll work, but only partially. If you miswire, you may or may not damage your networking gear (I honestly have no idea if there are saftey devices built in, but putting the wrong wires in the wrong places can never be good). You may have a bad contact - this'll work some times but not other times, the result being decreased speeds due to more errors.
Put simply, this approach might work, but depending on the problem, you might get misleading results. If you wanna get into this stuff, just dish out the 25 bucks and be sure. It has the added benefit that when your friends start to do this stuff, you can hold out your tester in a beam of light from the window and they'll bow down to you and call you g - er, my dreamworld has krept into my thoughts again. Grar.
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