Identifying a cross-over cable

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Not sure if you have a straight or cross-over Ethernet cable? This simple visual test can tell you in two seconds.

Cross-over cables, while still needed occasionally, are becoming less relevant as modern router and switching equipment has builtin automatic sensors to compensate.

For instance, there was a time when the only way to connect two switches together was via a crossover cable. However, today, most switches will accept either a straight or cross-over.
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How far back in time are we talking about when cross-over cables become "less relevant"? I'm attempting to transfer files from 2012 desktop to a new one . Thanks.

jamesjwalsh
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What happens when we connect straight cable instead of crossover cable.

prashantmore