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A technician is working on a desktop PC and wants to verify its NIC is functional. Which of the following should the technician use?
Correct Answer: B
A loopback plug is a device that can be used to test the functionality of a network interface card (NIC) by sending and receiving data packets from itself. The loopback plug connects to the NIC's port and simulates a network connection without requiring another device or cable. The technician can use a loopback plug to verify that the NIC is able to transmit and receive data without errors or interruptions.Reference: https://www.comptia.org/training/books/a-core-1-220-1101-study-guide (page 76)