How do you set the MAC address for a bridge?

• A. Change the admin MAC address
• B. Modify the bridge's primary interface MAC
• C. Disable MAC learning
• D. Use a separate management interface MAC

Answer: (A)

The bridge’s own addressing is controlled by its admin MAC address. This is the address the bridge uses for its own frames on the network and for management-related signaling, separate from the MACs of the ports that are part of the bridge. To set it, you configure the bridge’s admin-mac to the desired MAC address.

Other ideas don’t actually set the bridge’s MAC: there isn’t a concept of a bridge having a single “primary interface MAC” to modify, MAC learning affects how the bridge learns host addresses on its ports but doesn’t change the bridge’s own MAC, and using a separate management interface MAC pertains to management traffic rather than the bridge’s forwarding or identification MAC.