Discussion
What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?
Answer: C
Correct answer: Floods the network with the frame looking for the device
An unknown unicast is flooded out of every port except the one it arrived on, because the switch has no other way of reaching a destination it has not yet learned. The reply then teaches the switch where that device is, and subsequent frames are forwarded rather than flooded. Dropping the frame would break connectivity to any device that has not yet spoken.
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