Discussion
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?
Answer: C
Correct answer: Add the source address and port to the MAC address table and forward the frame out the destination port
The two halves of the switch’s job happen on every frame: it learns from the source address and forwards on the destination. Here the source is new, so the table gains an entry, and the destination is already known, so the frame goes out that one port rather than being flooded. Nothing about the unknown source causes a drop or a flood.
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