A client attempts to synchronize with a time server. It records the round-trip times and timestamps returned by the server in the table below.
Which of these times should it use to set its clock? To what time should it set it? Estimate the accuracy of the setting with respect to the server’s clock. If it is known that the time between sending and receiving a message in the system concerned is at least 8 ms, do your answers change?
The client should choose the minimum round-trip time of 20 ms = 0.02 s. It then estimates the current time to be 10:54:28.342 + 0.02/2 = 10:54:28.352. The accuracy is ± 10 ms.
If the minimum message transfer time is known to be 8 ms, then the setting remains the same but the accuracy improves to ± 2 ms.
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