Answer:
Loop-back plug tool is used as testing tool for network card.
Explanation:
During troubleshooting of the network, if it is required that network card is working properly or not, a tool named as Loop-back plug is used to inspect the functionality of the network. This tool is also used to test the different ports of the computer. The port that can be tested and troubleshooted with this tool includes USB port and network ports.
In this case, the technician found that network card is not working properly, He should use Loop back plug for testing the card.
