Final answer:
Ethernet straight-through wiring cables are used to connect different types of devices, while crossover cables are required when connecting similar devices.
Step-by-step explanation:
Ethernet straight-through wiring cables are used to connect different types of devices, such as a computer to a switch or a router to a modem. The wires inside these cables are arranged in the same order on both ends, allowing the signal to travel straight through from one device to another.
On the other hand, crossover cables are required when connecting similar devices, like a computer to another computer or a switch to another switch. In crossover cables, the wires inside are intentionally crossed over, allowing the transmit signal from one device to connect with the receive signal of the other device.
For example, if you want to connect two computers directly together without using a switch or a router, you would need to use a crossover cable.