In a typical ethernet network, PCs are connected to each other via a switch or hub. But when two PCs are connected to each other directly, or when two switches are connected, you sometimes need to use what is known as a crossover cable or uplink cable.
A crossover cable has the same physical connection as a standard network cable, but is wired slightly differently.
Crossover cables are not as common as they used to be thanks to the fact that most modern switches will automatically detect when a crossover cable is required and make the necessary adjustments internally, regardless of whether a normal or crossover cable is used.
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