Introduced in Win2k single-master owner operation is to define a well-known target for critical operations and to prevent the introduction of conflicts or latency that could be created by multi-master updates. Having a single-operation master means that the relevant FSMO role owner must be online, discoverable, and available on the network by computers needing to perform FSMO dependent operations. There are 5 roles and they should be strategically placed in a multi Domain Controller Active Directory environment.
- Schema Master : Scope = Enterprise ; Purpose = Used to introduce manual and programmatic schema updates from Administrators or applications such as exchange that will expand the AD Schema to provide exchange related schema updates.
- Domain Naming Master: Scope = Enterprise: Maintains the Domains within a forest and application partitions.
- Primary Domain Controller: Scope = Domain: Does everything an old NT3.51/NT40 PDC used to do..maintains domain time and password lookouts see links below for further details.
- Relevant ID : Scope = Domain: Maintains RID Pool
- Infrastructure Master: Scope = Domain & Application partition:Maintains domain cross references from the Global Catalog.
I always forget this stuff thought I'd type something up so I would remember....especially for interviews!!!
Petri FSMO Article
FSMO Microsoft Technet Article
RID Pool
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