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What tool is used to test serial and parallel ports?

  • A.high volt probe
  • B.cable scanner
  • C.loop backs (wrap plugs)
  • D.sniffer

Answer: C

Correct answer: loop backs (wrap plugs)

A loopback plug connects a port's output pins back to its input pins, so diagnostic software can send data and check that the same data returns. That tests the port itself without needing a device attached.

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