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What do you need to check serial and parallel port?

  • A.Port adapter
  • B.Logic probe
  • C.Loopback plug
  • D.All of the above

Answer: C

Correct answer: Loopback plug

A loopback plug joins a port's output pins to its input pins, so software can send data and check that the same data returns. That tests the port itself with nothing attached to it.

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