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Two machines can use the timestamp request and timestamp replay messages to determine the ___________ needed for an IP datagram to travel between them.

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Two machines can use the timestamp request and timestamp replay messages to determine the ___________ needed for an IP datagram to travel between them.

(a) Half-trip time

(b) Round-trip time

(c) Travel time for the next router

(d) Time to reach the destination/source

This question was posed to me during an interview.

My question is based upon ICMP in section TCP/IP Protocol Suite of Computer Network

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Right option is (b) Round-trip time

The best I can explain: The round-trip time refers to the total time taken combining the time taken for a packet sent from a source to reach a destination and the time taken the acknowledgement sent by the destination to reach the source. The Router sends destination unreachable message if the destination is not found.

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