A switch is powered on for the first time Ten devices Hosts

A switch is powered on for the first time. Ten devices, Hosts A through J, are connected to the switch. Which of the following are true for the first frame received by the switch?

A. The switch records the destination MAC address in the frame and the incoming interface pair in the CAM table.

B. The switch records the source MAC address in the frame and the incoming interface pair in the CAM table.

C. The frame is flooded to all other devices connected to the switch.

D. The frame is sent only to the intended port.

Solution

B and C are correct. As frames enter a newly powered-on switch, the CAM table is empty. The switch records the source address, and its originating interface, in the table and floods the message.

A and D are incorrect. A is incorrect because recording the destination address with an incoming interface would not work. Switches record the source address. D is incorrect because a switch will flood any unicast message it receives that does not match an entry in the CAM table.