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 exceededThis 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

When a router cannot route a datagram or host cannot deliver a datagra

1.	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 exceededThis 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
Answer» 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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