A network administrator needs to monitor traffic on a specific port on a switch.

Port mirroring is a feature that allows a switch to copy the traffic from one or more ports to another port for monitoring or analysis purposes. Port mirroring can help a network administrator to troubleshoot network problems, detect security threats, or optimize network performance. Port mirroring can be configured on most switches using the command-line interface (CLI) or a graphical user interface (GUI).

References:

CompTIA Network+ N10-008 Certification Exam Objectives, page 51

CompTIA Network+ N10-008 Cert Guide, Chapter 11: Switching Technologies

Port Mirroring - CompTIA Network+ Certification (N10-008): The Total Course [Video]1

CompTIA Network+ N10-005: 2.1 – Port Mirroring - Professor Messer IT Certification Training Courses2

CompTIA Network+ N10-005: 1.4 – Port Mirroring3