A technician suspects a network card is not working. Which tool should the technician use to test the network card?

Cable tester

Loopback plug

Multimeter

Tone generator and probe

Loop-back plug is used to test the network card.

Explanation:

The device that is used to troubleshoot different ports of computer such as USB port, network ports. It is also used to test the issues in Network network card if that is not working properly.

So the technician should use loop-back plug to test the network card in case the card is not working.