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Abbreviated as DC, domain controller is a server on a Microsoft Windows or Windows NT network that is responsible for allowing host access to Windows domain resources. The domain controllers in your network are the centerpiece of your Active Directory directory service.bbreviated as DC, domain controller is a server on a Microsoft Windows or Windows NT network that is responsible for allowing host access to Windows domain resources. The domain controllers in your network are the centerpiece of your Active Directory directory service.
With Windows NT 4 Server, one domain controller per domain was configured as the primary domain controller (PDC); all other domain controllers were backup domain controllers (BDC). Because of the critical nature of the PDC, best practices dictated that the PDC should be dedicated solely to domain services, and not used for file, print or application services that could slow down or crash the system.