Cisco 200-150 Exam

What action does a switch take if the destination MAC address is unknown?

  • A. Discard frame
  • B. Send ICMP unreachable message to source
  • C. Flood packet on all ports
  • D. Compare destination IP address against an ACL to determine if it is permitted
  • E. Send gratuitous ARP on all ports and wait for reply before forwarding
Answer: Option C.
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 theunknown destination address to all of its ports (apart from the port where the frame came from).
This process is called unknown unicast flooding. ”
Switch Learning and Forwarding

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