If a frame arrives with a broadcast destination MAC, what is the switch's action?

• A. The switch drops the frame.
• B. The switch sends the frame only to the port the frame arrived on.
• C. The switch forwards the frame to all ports except the ingress port.
• D. The switch copies the frame to its MAC address table.

Answer: (C)

Broadcast frames are meant for every device in the same VLAN. A switch can’t determine one specific destination from a broadcast, so it floods the frame out all ports in that VLAN except the port it arrived on. This ensures every host on that segment receives the message. It wouldn’t drop the frame, and it wouldn’t restrict delivery to only the ingress port. The MAC address table is used to forward unicast frames to a single learned port, not to handle broadcasts. So flooding to all appropriate ports (except the ingress) is the correct behavior.