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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.

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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.

(a) Destination unreachable

(b) Source quench

(c) Router error

(d) Time exceeded

This question was posed to me during a job interview.

I'd like to ask this question from ICMP in portion TCP/IP Protocol Suite of Computer Network

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Correct option is (a) Destination unreachable

Easiest 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.

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