Which FSMO role is responsible for guaranteeing unique relative IDs (RIDs) in a domain?

Which FSMO role is responsible for guaranteeing unique relative IDs (RIDs) in a domain?

• A. Infrastructure Master
• B. Schema Master
• C. Domain Naming Master
• D. RID Master

Answer: (D)

The key idea is how object identifiers are kept unique within a domain. In Active Directory, every object gets a relative ID (RID) as part of its security identifier (SID), and those RIDs must be unique inside the domain. The central role that guarantees this is the RID Master. It holds the domain’s pool of RIDs and hand-picks blocks of RIDs to domain controllers as needed. When a domain controller creates a new object, it uses the next available RID from its local pool; if it runs low, it requests more RIDs from the RID Master, which then issues another block. This centralized management prevents any two objects from sharing the same RID, ensuring uniqueness of SIDs across the domain. The other FSMO roles govern different areas: the Infrastructure Master handles cross-domain updates to group memberships, the Schema Master controls changes to the AD schema, and the Domain Naming Master manages adding or removing domains in the forest.

The key idea is how object identifiers are kept unique within a domain. In Active Directory, every object gets a relative ID (RID) as part of its security identifier (SID), and those RIDs must be unique inside the domain. The central role that guarantees this is the RID Master. It holds the domain’s pool of RIDs and hand-picks blocks of RIDs to domain controllers as needed. When a domain controller creates a new object, it uses the next available RID from its local pool; if it runs low, it requests more RIDs from the RID Master, which then issues another block. This centralized management prevents any two objects from sharing the same RID, ensuring uniqueness of SIDs across the domain. The other FSMO roles govern different areas: the Infrastructure Master handles cross-domain updates to group memberships, the Schema Master controls changes to the AD schema, and the Domain Naming Master manages adding or removing domains in the forest.