Question

When a node synchronizes its clock to that of another node. It is generally a good idea to take previous measurements into account as well. Why? Also give an example of how such past readings could be taken into account.

Answer 1

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The obvious reason is that there may be an error in the current reading. Assuming that clocks need only be gradually adjusted, one possibility is to consider the last N values and compute a median or average. If the measured value falls outside a current interval, it is not taken into account (but is added to the list). Likewise, a new value can be computed by taking a weighted average, or an aging algorithm.

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