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Unknown Unicast Definition: Unknown Unicast is a network packet transmitted to a specific destination that the switch has not learned yet, requiring the switch to flood the packet to all ports except the one it was received from.
Unknown Unicast refers to a unicast frame within a network where the MAC (Media Access Control) address of the destination is not listed in the MAC address table. This typically occurs when a network device sends data to a specific destination but the switch does not have the MAC address of that recipient in its table. The switch then broadcasts the frame to all ports except the one it was received on, in an attempt to update its MAC address table for future communication with that specific device.