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When a switch receives a frame with source and destination unknown to it, what does it do?
It inserts the frames destination mac address into its CAM table and them perform an unknown unicast forwarding.
It inserts the frames source mac address into its CAM table and them perform an unknown multicast forwarding.
It inserts the frames source mac address into its CAM table and them perform an unknown unicast forwarding.
Drops the frame.
Forwards the frame to a random port where the destination host might be.
When a switch receives a frame from a destination it does not know, it inserts the source mac address into its CAM table (a table which maps mac addresses to ports) and forwards the frame to all ports. The process of broadcasting a unicast frame is called unknown unicast. When de destination host responds to the frame, the switch then puts its mac address on the CAM table and the hosts can talk directly.
Serious? Your question asks what it does with a frame when it doesn't know what the source and destination are, but in the answer you say it inserts the source that it doesn't know into its CAM table? Phrase it better. Say that the frame comes with the source. The question is misleading.
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