Explaining Update Sequence Numbers
All enterprise directory services implementations require a mechanism to handle the incremental storage of changes made to directory objects. In other words, whenever a password is changed, that information must be accurately passed to all DCs in the domain. This mechanism must also be able to apply only those changes that occurred at the most recent intervals.
Many directory services implementations relied on exact time synchronization on all DCs to synchronize information. However, keeping the clocks of multiple servers in sync has been proven to be extremely difficult, and even slight variations in time could affect replication results.
Thus was born the concept of the update sequence number (USN). AD DS ...
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