What is the RID Master role?

What is the RID Master role?

• A. The DC responsible for password changes
• B. The Domain Naming Master
• C. A single DC responsible for processing RID pool requests from all DCs within a domain
• D. A backup domain controller

Answer: (C)

RID Master is a Flexible Single Master Operation role assigned to one domain controller in each domain. Its job is to issue blocks of relative IDs to domain controllers so that every new object created within the domain can be given a unique SID. The DCs use their assigned RID blocks to stamp new objects with unique identifiers; when a DC's block runs dry, it requests another from the RID Master. This centralization prevents duplicate SIDs across the domain. If the RID Master is unavailable, DCs cannot obtain new RID blocks and object creation stalls until the role is transferred. The Domain Naming Master handles forest-wide domain naming operations, not RID allocation, and a backup domain controller is not a dedicated FSMO role—any DC can hold a copy of AD data and continue replication, but it doesn’t perform RID allocation.

RID Master is a Flexible Single Master Operation role assigned to one domain controller in each domain. Its job is to issue blocks of relative IDs to domain controllers so that every new object created within the domain can be given a unique SID. The DCs use their assigned RID blocks to stamp new objects with unique identifiers; when a DC's block runs dry, it requests another from the RID Master. This centralization prevents duplicate SIDs across the domain. If the RID Master is unavailable, DCs cannot obtain new RID blocks and object creation stalls until the role is transferred. The Domain Naming Master handles forest-wide domain naming operations, not RID allocation, and a backup domain controller is not a dedicated FSMO role—any DC can hold a copy of AD data and continue replication, but it doesn’t perform RID allocation.