What is used to duplicate all traffic on one port in a switch to another switch port?

To duplicate all traffic on one port to another port in a switch, a feature called "port mirroring" or "SPAN" (Switched Port Analyzer) is used. This feature allows the network administrator to configure the switch to send a copy of all the packets from a specified port or VLAN to another designated port for monitoring or analysis. It is commonly used for network monitoring, troubleshooting, and performance analysis.