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Five FSMO Roles

 

In Microsoft Windows domain, there are five FSMO roles that are assigned to one or more domain controllers. There are two operations master roles for each forest and three FSMO roles for each domain as following:


• Schema Master: The schema master domain controller manages all updates and modifications to the schema. At any one time, you can have only one schema master in the whole forest.


• Domain naming master: The domain naming master domain controller manages the addition or removal of domains in the forest. As the same as Schema Master, you can have only one domain naming master in the whole forest.


• Infrastructure Master: The infrastructure is in charge of updating references from objects in its domain to objects in other domains. You can have  only one domain controller acting as the infrastructure master in each domain.


• Relative ID (RID) Master: The RID master is in charge of processing RID pool requests from all domain controllers in a particular domain. As the same as Infrastructure Master, you can have only one domain controller acting as the RID master in the domain.


• PDC Emulator: The PDC emulator is a domain controller that advertises itself as the primary domain controller (PDC) to all workstations, member servers, and domain controllers that are running earlier versions of Windows. The PDC is also the Domain Master Browser, and it handles password discrepancies. You can have only one domain controller acting as the PDC emulator master in each domain in the forest.

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