Which ICMP message type is used to assist path MTU discovery?
A.
destination unreachable
B.
redirect message
C.
source quench
D.
time exceeded
Which ICMP message type is used to assist path MTU discovery?
Which ICMP message type is used to assist path MTU discovery?
Answer is A
When a router is unable to forward a datagram because it exceeds the
MTU of the next-hop network and its Don’t Fragment bit is set, the
router is required to return an ICMP Destination Unreachable message
to the source of the datagram, with the Code indicating
“fragmentation needed and DF set”.