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Backup Domain Controller




Most domains will have at least one BDC, often there are several BDCs in a domain. These domains exist to provide fault tolerance. If the PDC fails, then it can be replaced by a BDC. In such circumstances, an administrator promotes a BDC to be the new PDC. BDCs can also authenticate user logon requests - and take some of the authentication load from the PDC.

When Windows 2000 was released, the NT domain as found in NT 4 and prior versions was replaced by Active Directory . In Active Directory domains running in Native Mode the concept of the primary and backup domain controllers do not exist. In these domains, all domain controllers are considered to be equal.