A straight-through cable is the same at both ends. A straight-through cable uses pins 1, 2, 3, and 6. The send and receive wires are not crossed. You should use a straight-through cable when connecting dissimilar devices. Examples include connecting PCs to switches or hubs or a router to a switch or a hub.
Crossover cable
A crossover cable is a cable that has the send and receive wires crossed at one of the ends. On a Category 5 cable, the 1 and 3 wires and the 2 and 6 wires are switched on one of the cable’s ends. You should use a crossover cable when connecting similar devices, such as connecting a router to a router, a switch to a switch or hub, a hub to a hub, or a PC to a PC.Important tip — Router (think of it as a PC) to PC via 10BaseT (NIC) uses a “crossover cable”. (contradicts the rule)
Rolled Cable
In a rolled cable, the colored wires at one end of the cable are in the reverse sequence of the colored wires at the other end of the cable.
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