The Domain Controller lingo hails from the world of Microsoft Servers. In NT Server, one controller was configured as the Primary Domain Controller with the others being mere BDCs. Updates such as password changes and group membership could only be made via the PDC which would then propagate changes to all the BDCs responsible for authenticating users to the domain. From a DR perspective, if the PDC were to go down, a BDC could be promoted to PDC status. PDCs are recommended to be on dedicated machines running nothing else owing to their critical nature.
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