Why will a switch flood a frame out all ports?
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Correct answer: The destination MAC address of the frame is unknown..
Why this is the answer
A switch floods a frame out all ports (except the incoming port) when it does not have an entry for the destination MAC address in its MAC address table. This is how switches learn the location of devices on the network. When a device replies, the switch then learns its MAC address and the port it's connected to. Incorrect options: The frame has zero destination MAC addresses: Frames always have a destination MAC address. The source MAC address of the frame is unknown: The source MAC address is used by the switch to populate its MAC address table, not to determine flooding. The source and destination MAC addresses of the frame are the same: This would indicate a frame sent to itself, which is not a reason for flooding by the switch.
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