Which ICMP error message may be returned when a router cannot forward a packet to its destination?
Options
- A. Echo Request
- B. Echo Reply
- C. Destination Unreachable
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
C. Destination Unreachable
Detailed Explanation
Correct Answer: Destination Unreachable
- Destination Unreachable is an ICMP error message.
- A router or destination host may generate it when a packet cannot be delivered.
- It can indicate problems such as an unreachable network, host or port.
- It is different from the normal ICMP Echo Reply used by ping.