by liuhan
In Active Directory, all of the objects in the forest are represented in the directory tree, a hierarchy of objects and containers. For each forest, the directory tree is partitioned to allow sections to be distributed to domain controllers in different domains within the forest. Each domain controller stores a copy of a specific part of the directory tree, called a directory partition. A directory partition is also known as a naming context. The copy of the directory partition is called a replica. A replica contains all attributes for each directory partition object and is readable and writable. In the Microsoft Windows Server 2003 operating system, the replication process ensures that changes made to a replica on one domain controller are synchronized to replicas on all other domain controllers within the domain.
Information Replicated
At least three types of directory partition replicas are stored on each domain controller:
Schema partition Contains definitions of objects that can be created in the for¬
est and the attributes those objects can have. Objects in the schema partition must
be replicated to all domain controllers in all domains in the forest.
Configuration partition Contains objects that represent the logical structure of
the forest deployment, including the domain structure and replication topology.
Objects in the configuration partition must be replicated to all domain controllers
in all domains in the forest.
Domain partition Contains all of the objects stored in a domain. Objects in the
domain partition can be replicated only to domain controllers within the domain.
In addition, a new type of directory partition-the Application directory partition-is available only to domain controllers in the Windows Server 2003 operating system. This partition is used by applications and services to store application-specific data, which can include any type of object except security principals (users, groups, and computers). The application partition can be configured to replicate objects to any set of domain controllers in the forest, not necessarily all in the same domain. This partition provides the capability to host data in Active Directory without significantly impacting network performance by providing control over the scope of replication and placement of replicas. Therefore, dynamic data from network services such as Remote Access Service (RAS), RADIUS, Dynamic Host Configuration Protocol (DHCP), and Common Open Policy Service (COPS) can reside in a directory, allowing applications to access them uniformly with one access methodology.
Some domain controllers are global catalog servers. On these domain controllers, there is also stored a partial replica of directory partition objects from other domains, for the purpose of finding information throughout the domain tree or forest. A partial replica contains a subset of the attributes of a directory partition replica and is read-only. To be stored in a partial replica, an attribute must have the isMember Of PartialAttributeSet value on its attributeSchema object set to TRUE.
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Drive from {a href="http://www.http://www.aplus-220-701.com/"}CCIE In Active Directory, all of the objects in the forest are represented in the directory tree, a hierarchy of objects and containers.At least three types of directory partition replicas are stored on each domain controller.{a href="http://www.http://www.cathayschool.com/"}CCIE training
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