Windows 2000 doesn't employ PDCs, BDCs, and the single master replication scheme that Windows NT 4.0 does. Instead, all domain controllers have a read-write copy of the directory and use multimaster replication to ensure that the changes you make on one domain controller copy to the other domain controllers in the domain. Although the Win2K model is more scalable and flexible, it can present some interesting challenges when you perform administrative tasks, such as restoring Active Directory (AD).
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