Discussion
Which statements are true regarding ICMP packets?
1.They acknowledge receipt of a TCP segment.
2.They guarantee datagram delivery.
3.They can provide hosts with information about network problems.
4.They are encapsulated within IP datagrams.
Answer: C
Correct answer: 3 and 4
Statements 3 and 4 are correct: ICMP reports network problems - destination unreachable, time exceeded, redirects - and its messages travel encapsulated inside IP datagrams. Statement 1 is wrong, since acknowledging TCP segments is TCP’s own job. Statement 2 is wrong because ICMP reports failures rather than preventing them; IP remains an unreliable, best-effort service whatever ICMP says about it.
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