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Domain Controller Roles
A domain controller is a server that is running a
version of the Microsoft Windows Server 2003 or
Windows 2000 Server operating system and has the
Active Directory directory service installed.
Note
| • |
Implementations of the
Microsoft Windows NT 3.51 and Microsoft
Windows NT 4.0 operating systems also have
domain controllers, but they do not support
Active Directory. |
When you install Windows Server 2003 or
Windows 2000 Server on a computer, you can choose to
configure a specific server role for that computer.
When you want to create a new forest, a new domain,
or an additional domain controller in an existing
domain, you configure the server with the role of
domain controller by installing Active Directory.
By default, a domain controller stores one domain
directory partition consisting of information about
the domain in which it is located, plus the schema
and configuration directory partitions for the
entire forest. A Windows Server 2003 domain
controller can also store one or more application
directory partitions. There are also specialized
domain controller roles that perform specific
functions in an Active Directory environment. These
specialized roles include global catalog servers and
operations masters. Global Catalog Servers
Every domain controller stores the objects for the
domain in which it is installed. However, a domain
controller designated as a global catalog server
stores the objects from all domains in the forest.
For each object that is not in the domain for which
the global catalog server is authoritative as a
domain controller, a limited set of attributes is
stored in a partial replica of the domain.
Therefore, a global catalog server stores its own
full, writable domain replica (all objects and all
attributes) plus a partial, read-only replica of
every other domain in the forest. The global catalog
is built and updated automatically by the Active
Directory replication system. The object attributes
that are replicated to global catalog servers are
the attributes that are most likely to be used to
search for the object in Active Directory. The
attributes that are replicated to the global catalog
are identified in the schema as the partial
attribute set (PAS) and are defined by Microsoft.
However, to optimize searching, you can edit the
schema by adding or removing attributes that are
stored in the global catalog. The global catalog
makes it possible for clients to search Active
Directory without having to be referred from server
to server until a domain controller that has the
domain directory partition storing the requested
object is found. By default, Active Directory
searches are directed to global catalog servers.
The first domain controller in a forest is
automatically created as a global catalog server.
Thereafter, you can designate other domain
controllers to be global catalog servers if they are
needed. Operations Masters
Domain controllers that hold operations master roles
are designated to perform specific tasks to ensure
consistency and to eliminate the potential for
conflicting entries in the Active Directory
database. Active Directory defines five operations
master roles: the schema master, domain naming
master, relative identifier (RID) master, primary
domain controller (PDC) emulator, and infrastructure
master.
The following operations masters perform
operations that must occur on only one domain
controller in the forest:
| • |
Schema master |
| • |
Domain naming master |
The following operations masters perform
operations that must occur on only one domain
controller in the domain:
| • |
Primary Domain
Controller (PDC) emulator |
| • |
Infrastructure master |
| • |
Relative ID (RID)
master |
|
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