What does a switch do when it receives a frame whose destination MAC address is not in the MAC address table?
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Correct answer: It floods the frame unchanged across all remaining ports in the incoming VLAN..
Why this is the answer
When a switch receives a frame with an unknown destination MAC address, it floods the frame out of all ports in the same VLAN, except the port it was received on. This ensures the frame reaches the intended recipient if it exists within that VLAN. The switch does not modify the frame's checksum; that would corrupt the frame. It also doesn't update its CAM table with the destination MAC address; it learns source MAC addresses. Finally, it does not create static entries or shut down ports in this scenario; these are administrative actions, not automatic responses to unknown MAC addresses.
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