Outlining Multimaster Topology Concepts
AD DS was specifically written to allow for the creation, modification, and deletion of directory information from multiple DCs. This concept, known as multimaster replication, allows no one DC to be authoritative. If any DCs go out of service, any one of the rest of the writable DCs can make changes to directory information. Those changes are then replicated across the domain infrastructure. Of course, there needs to be some level of control on this type of replication so that only the most recent changes take precedence. This type of control is realized in AD DS through the concept of update sequence numbers (USNs).
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