What are the fsmo roles?

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Accepted Answer

The FSMO (Flexible Single Master Operations) roles are specialized domain controller roles in Active Directory that manage specific operations.

There are five FSMO roles: Schema Master, Domain Naming Master, RID Master, PDC Emulator, and Infrastructure Master.
The Schema Master role manages modifications to the Active Directory schema.
The Domain Naming Master role controls the addition or removal of domains in the forest.
The RID Master role allocates unique security identifiers (SIDs) to objects created in a domain.
The PDC Emulator role provides backward compatibility for older Windows NT systems and acts as the primary domain controller for password changes and time synchronization.
The Infrastructure Master role ensures that cross-domain object references are correctly maintained.
Each FSMO role can be held by only one domain controller in a forest or domain.

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