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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.

Explanation

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