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
Explanation:
“What happens though when the switch receives a frame with a destination MAC address that is
not includedin the table? In that case the switch will just broadcast/flood the frame with the
unknown destination address toall of its ports (apart from the port where the frame came from).
This process is called unknown unicastflooding. “
http://telconotes.wordpress.com/2013/03/09/how-a-switch-works/