220-1201 Question #340: Real Exam Question with Answer & Explanation

The correct answer is D: Loopback plug. A loopback plug is a diagnostic tool used to test the functionality of a physical port (e.g., Ethernet, serial, fiber) by routing the output signals back into the input. This simulates a network connection and allows a technician to verify that the port's internal transmission an

Submitted by valeria.br· Mar 30, 2026DOMAIN_LIST_NOT_PROVIDED

Question

Which of the following is used to confirm that a physical port is working?

Options

ANetwork tap
BCrimper
CPatch panel
DLoopback plug

Explanation

A loopback plug is a diagnostic tool used to test the functionality of a physical port (e.g., Ethernet, serial, fiber) by routing the output signals back into the input. This simulates a network connection and allows a technician to verify that the port's internal transmission and reception hardware is working correctly. If data is sent out and received back without errors, the physical port is considered functional.

Topics

#Loopback plug#Physical port testing#Troubleshooting tools

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