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Question:

What could you use to help you find the other end of the cable in the case that you find that one of the computers you connected them to is showing as if there is nothing connected after running 100 ethernet cables for your new office? You need to find where the other end connects in the data closet, but you forgot to label the cables.

A toner probe
Explaination

You can find the other end by waving a toner probe around the area you think it could be by plugging in a tone generator at the jack of one end of the cable. when you have found the end of the cable a loud tone noise will generate.