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Which of these is not a type of error-reporting message?

(a) Destination unreachable

(b) Source quench

(c) Router error

(d) Time exceeded

I have been asked this question during an internship interview.

I'm obligated to ask this question of ICMP topic in chapter TCP/IP Protocol Suite of Computer Network

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Right option is (c) Router error

To explain I would say: Router error is not a type of error-reporting message in ICMP. The type of error reporting message is specified in the ICMP header. Destination unreachable is type 3 error message, source quench is type 4, and time exceeded is type 11 error message.

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