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| | Domain controller - Wikipedia, the free encyclopedia |
 | | On Windows Server Systems, the domain controller (DC) is the server that responds to security authentication requests (logging in, checking permissions, etc.) within the Windows Server domain. |
 | | In Windows NT, the central domain controller was known as the Primary Domain Controller (PDC), of which there could only be one with this role; all other domain controllers were identified as Backup Domain Controllers (BDC). |
 | | In Windows 2000 and later the concept of primary and backup domain controllers were eliminated, partially to emphasize the multi-master replication technology available in Windows; however, there are still a number of master roles that only one domain controller can perform: schema master, domain naming master, infrastructure master, Relative ID master, and the PDC Emulator. |
| en.wikipedia.org /wiki/Domain_controller (224 words) |
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