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Answer Posted / kannan
FSMO Roles
In a forest, there are at least five FSMO roles that are
assigned to one or more domain controllers. The five FSMO
roles are:
* Schema Master: The schema master domain controller
controls all updates and modifications to the schema. To
update the schema of a forest, you must have access to the
schema master. There can be only one schema master in the
whole forest.
* Domain naming master: The domain naming master domain
controller controls the addition or removal of domains in
the forest. There can be only one domain naming master in
the whole forest.
* Infrastructure Master: The infrastructure is
responsible for updating references from objects in its
domain to objects in other domains. At any one time, there
can be only one domain controller acting as the
infrastructure master in each domain.
* Relative ID (RID) Master: The RID master is
responsible for processing RID pool requests from all domain
controllers in a particular domain. At any one time, there
can be only one domain controller acting as the RID master
in the domain.
* PDC Emulator: The PDC emulator is a domain controller
that advertises itself as the primary domain controller
(PDC) to workstations, member servers, and domain
controllers that are running earlier versions of Windows.
For example, if the domain contains computers that are not
running Microsoft Windows XP Professional or Microsoft
Windows 2000 client software, or if it contains Microsoft
Windows NT backup domain controllers, the PDC emulator
master acts as a Windows NT PDC. It is also the Domain
Master Browser, and it handles password discrepancies. At
any one time, there can be only one domain controller acting
as the PDC emulator master in each domain in the forest.
You can transfer FSMO roles by using the Ntdsutil.exe
command-line utility or by using an MMC snap-in tool.
Depending on the FSMO role that you want to transfer, you
can use one of the following three MMC snap-in tools:
Active Directory Schema snap-in
Active Directory Domains and Trusts snap-in
Active Directory Users and Computers snap-in
If a computer no longer exists, the role must be seized. To
seize a role, use the Ntdsutil.exe utility.
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