Which command can be used to find the MAC address of the current root switch?

Using the command to show spanning-tree information is the correct approach for identifying the MAC address of the current root switch. The spanning-tree protocol (STP) is designed to prevent loops in network topologies by designating a root bridge for a given VLAN. When you execute the command to display spanning-tree details, it provides crucial information, including the bridge ID, which contains the MAC address of the root switch. This enables network administrators to quickly ascertain which switch is serving as the root bridge and to verify its status within the STP topology.

The other commands serve different purposes. For instance, the command to show interfaces mainly provides information about the operational state and statistics of interfaces on the switch, but does not display spanning-tree information. The command to show VLAN focuses on details related to VLANs configured on the device, such as the VLAN ID and associated ports, but again lacks the necessary information about the root bridge. Finally, while the command to show the MAC address table does display MAC addresses of devices connected to the switch, it doesn't provide information regarding the root switch specifically in the context of STP. Therefore, the spanning-tree command is the direct method for retrieving the current root switch's MAC address.