What tool can test physical ports?

When working with hardware, you may need to test the operation and functionality of the physical ports on a computer. What tool allows you to run diagnostics software to test the physical operation of computer ports?

A) Multimeter

B) Torx screwdriver

C) Loopback plug

D) Crossover cable

The answer: C) Loopback plug

A loopback plug will take the signal from a physical port and loop it back into a computer. Diagnostics software will send signals out of the port and look for the same signal to arrive back into the computer.

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