When a switch receives a frame with destination MAC FF:FF:FF:FF:FF:FF?

• A. The switch forwards it out all ports except the ingress port.
• B. The switch does not forward the frame.
• C. The switch forwards it only to the destination port.
• D. The switch sends the frame to a connected router because the destination is broadcast.

Answer: (B)

Broadcast frames are meant for every device on the local network segment. A switch doesn’t know a single destination port for such frames because there isn’t one in the CAM table. To ensure every host on the same VLAN sees the frame, the switch floods it out all active ports in that VLAN except the port it was received on. It doesn’t go to ports in other VLANs unless a router or layer-3 device routes it, which is not done by the switch alone.