What is the difference between an ethernet cable and an ethernet “crossover” cable? I would like to wire my two computers together so that data could be transferred. Both computers have an available ethernet port. I have additional ethernet cables available. How do these cables differ from the crossover variety? How much should I expect to spend on a crossover cable?

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Strictly speaking it’s just a cable where two of the wires are crossed and that allows you to connect computers without a router or hub in-between.

If you are talking about Mac to Mac then any hardware Apple has put out since about 2000 has been capable of auto-detecting and doesn’t require a cross-over cable.