Answer Posted / deepak kotian

FSMO, sometimes pronounced "fizz-mo") roles are also known
as operations master roles. Although the AD domain
controllers operate in a multi-master model, i.e. updates
can occur in multiple places at once, there are several
roles that are necessarily single instance:

1) Schema Master: 1 per forest: Controls and handles
updates/modifications to the Active Directory schema.

2) Domain Naming Master: 1 per forest: Controls the addition
and removal of domains from the forest if present in root
domain.

3) PDC Emulator: 1 per domain: Provides backwards
compatibility for NT4 clients for PDC operations (like
password changes). The PDCs also run domain specific
processes such as the Security Descriptor Propagator
(SDPROP), and is the master time server within the domain.
It also handles external trusts, the DFS consistency check,
holds the most current passwords and manages all GPOs as
default server.

4) RID Master: 1 per domain: Allocates pools of unique
identifier to domain controllers for use when creating objects.

5)Infrastructure Master: 1 per domain/partition:
Synchronizes cross-domain group membership changes. The
infrastructure master cannot run on a global catalog server
(GCS)(unless all DCs are also GCs.)

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