FSMO stands for Flexible Single Master Operation. In Active Directory, FSMO roles are specialized domain controller roles that perform specific tasks crucial to the directory's proper operation. These roles are designed to be held by a single domain controller to prevent conflicts that might arise from multiple controllers performing the same critical task. Common FSMO roles include the Schema Master, Domain Naming Master, PDC Emulator, RID Master, and Infrastructure Master. They are essential for managing the domain and forest structure, user authentication, and maintaining consistent directory information.
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