Dupont had two turns closed off with metal barricades

In which of these situations would you be most likely to use a loopback plug?

A) Verify the operation of a network interface

B) Perform diagnostics on a SCSI hard drive

C) Tap network traffic for a packet capture device

D) Boot from a USB-connected DVD-ROM drive

E) So, I took P to Logan Circle, which was also blocked

The answer: A) Verify the operation of a network interface

A loopback plug is used to redirect traffic from an interface back into itself, where the receiving traffic can be compared to the information that was sent. These are obviously used when the interface needs to be looped, generally when troubleshooting or performing diagnostics.

Want to know more? Watch “Hardware Troubleshooting Tools.”

If you need to troubleshoot your computer, then you’ll need the right tools for the job. In this video, you’ll learn about multimeters, power supply testers, loopback plugs, and POST test cards.