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Ethernet MAC Learning

Watch a switch learn source MACs, flood unknown unicast, isolate VLANs, and block loops with spanning tree.

SwitchVLAN 10Host Aport 7Host Bport 12frameMAC table70:4d:7b:aa:11:29 -> port 7unknown unicast flood
Step 1 / 4First frame: learn source, flood unknown destination

The switch learns which port the source MAC came from. Because it has not seen the destination MAC before, it sends the frame out every other port in the same VLAN.

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