Discussion
Which protocol is used to send a destination network unknown message back to originating hosts?
Answer: C
Correct answer: ICMP
ICMP carries the error and diagnostic messages of the IP suite, including destination unreachable - of which "network unreachable" is one code - time exceeded, and the echo request and reply that ping uses. A router that has no route to a destination discards the packet and returns an ICMP message to the source. ARP resolves IP addresses to MAC addresses, and TCP handles reliability for its own connections only.
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