1.1.c [i] Unicast flooding

This happen when the switch does not have the destination mac address in his Layer 2 table. It is call an Unknown unicast , it  Floods frame out all interfaces in the same VLAN, except the interface on which the frame was received.

Cause 1: Asymmetric Routing
Cause 2: Spanning-Tree Protocol Topology Changes
Cause 3: Forwarding Table Overflow




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