A technician must copy traffic from a live link so it can be monitored, without disconnecting that link. Which tool does that?
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Short Explanation
You want a copy of the conversation while the two ends keep talking. That copy is a network tap. A plug that folds a port back on itself, a crimp tool, and a jacket stripper do not listen to a live link.
Full Explanation
A network tap sits on a link and copies the traffic for a monitor while the original path stays up. That is the tool for a live link that must not be disconnected. A loopback plug returns a port's transmit to its own receive so you can test the port. It replaces the live path instead of copying it. A crimper fastens a plug. It does not monitor frames. A stripper removes a jacket. It does not split a pair out to an analyzer. Exam caveat: a tap has to be rated for the link's speed. An old tap on a faster link becomes the bottleneck or fails to copy. Operational check: insert the tap, confirm the original devices still pass traffic, and confirm the monitor sees a copy. Confirm the original devices still pass traffic while the monitor sees a copy. Note the result on the ticket. Use a tap rated for the link speed so the copy is not the bottleneck.