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/sourceThis question was posed to me during an interview.My question is based upon ICMP in section TCP/IP Protocol Suite of Computer Network

Two machines can use the timestamp request and timestamp replay messag

1.	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/sourceThis question was posed to me during an interview.My question is based upon ICMP in section TCP/IP Protocol Suite of Computer Network
Answer» 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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