A coworker is asking for your advice on a problem with a computer that will not communicate on the network. While assisting the coworker, you suspect that the wired NIC may have failed. Which of the following will you recommend to your coworker as the best tool to diagnose this issue?

Network Multimeter, Loopback plug

Explanation:

Network Multimeter as well as a Loopback plug.

A Network Multimeter lets you identify the best connection strength of the networks around you. While a Loopback plug is a connector used for diagnosing transmission problems. Also called a "wrap plug," it plugs into an Ethernet or serial port and crosses over the transmit line to the receive line so that outgoing signals can be redirected back into the computer for testing

Network Multimeter, Loopback plug

Explanation:

Based on the information provided within the question it can be said that in this scenario the coworker may want to use both a Network Multimeter as well as a Loopback plug. A Network Multimeter lets you measure the connection strength of the networks around you. While a Loopback plug will allow you to diagnose any and all transmission problems that may be occurring through the transmition line.