PC1 tries to send traffic to newly installed PC2. The PC2 MAC address is not listed in the MAC address table of the switch, so the switch sends the packet to all ports in the same VLAN Which switching concept does this describe?
frame flooding. When a switch receives a frame and does not have the destination MAC address in its MAC address table, it floods the frame out all ports in the same VLAN except the ingress port. That behavior is called frame flooding or unknown-unicast flooding. MAC address aging can cause an entry to disappear, but the described action is the flooding behavior itself. Spanning Tree prevents loops; it does not describe this forwarding action. Cisco CCNA 200-301 v1.1 Network Access expects engineers to understand how switches learn source MAC addresses and forward or flood based on destination MAC lookups. The corrected answer is frame flooding. Once the destination host replies, the switch can learn the missing MAC address and forward future traffic directly.
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