200-150 · Question #89
What action does a switch take if the destination MAC address is unknown?
The correct answer is C. Flood packet on all ports. "What happens though when the switch receives a frame with a destination MAC address that is not included in the table? In that case the switch will just broadcast/flood the frame with the unknown destination address to all of its ports (apart from the port where the frame came…
Question
What action does a switch take if the destination MAC address is unknown?
Options
- ADiscard frame
- BSend ICMP unreachable message to source
- CFlood packet on all ports
- DCompare destination IP address against an ACL to determine if it is permitted
- ESend gratuitous ARP on all ports and wait for reply before forwarding
How the community answered
(32 responses)- A3% (1)
- C91% (29)
- D6% (2)
Explanation
"What happens though when the switch receives a frame with a destination MAC address that is not included in the table? In that case the switch will just broadcast/flood the frame with the unknown destination address to all of its ports (apart from the port where the frame came from). This process is called unknown unicast flooding. "
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