What command is used to display the dynamically learned MAC addresses on a Cisco switch?

The command that displays the dynamically learned MAC addresses on a Cisco switch is appropriately "show mac address-table dynamic." This command is crucial for network administrators as it provides insights into how Ethernet frames are being directed through the switch based on the MAC addresses learned on its interfaces.

When a switch receives a frame, it examines the source MAC address and records it along with the port from which the frame was received. The dynamic MAC address entries are stored in the switch's MAC address table and used to intelligently forward frames only to the correct ports, rather than flooding all ports.

This command also allows administrators to troubleshoot and monitor connectivity within the network by checking which devices are communicating and the paths their data is taking. Understanding the contents of the MAC address table can help in diagnosing issues related to VLANs, network loops, or misconfigurations.

In contrast, the other commands serve different purposes. The "show ip address-table" command is used for displaying ARP tables, "show interfaces" provides detailed information about the operational status of interfaces, and "show vlan" displays VLAN information which does not directly relate to MAC address learning. Each of these commands offers valuable information about the network but does not focus on the dynamically learned MAC addresses as the correct command does.