How does a switch handle frames with unknown destination MAC addresses?
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Correct answer: Floods the frame to all ports except the receiving port.
Why this is the answer
When a switch receives a frame, it checks its MAC address table for the destination MAC address. If the address is not found (it's an unknown unicast), the switch floods the frame out of all ports except the one it was received on. This ensures the frame reaches the intended recipient if it exists on the local network segment, and the recipient's response will allow the switch to learn its MAC address. Modifying frames or rewriting MAC addresses are not standard switch behaviors for unknown unicasts. Buffering frames based on CRC errors relates to error handling, not forwarding unknown destination MAC addresses.
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