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Computer Networks
Icmp
Q
When a router cannot route a datagram or host cannot deliver a datagram, the datagram is discarded and the router or the host sends a ____________ message back to the source host that initiated the datagram.
AA. Destination unreachable
BB. Source quench
CC. Router error
DD. Time exceeded
Correct Answer:
A. A. Destination unreachable
Explanation:
Router sends destination unreachable message if the destination is not found. Destination unreachable is type 3 error reporting message. It is invoked when the router can’t find a path to the intended destination to forward the packet through.
