Which of the following is a device used to test ports such as a network port?
Tone generator
Cable Tester
Loopback plug
Leakage tester
A loopback plug is used to test serial ports, USB ports and network ports. Most commonly you will see network loopback plugs for fiber and ethernet. Loopback plugs reflect signals making it possible to verify that an electrical signal is successfully transmitting between two endpoints.
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