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Replication
Domain Controllers OU
first domain controller in the forest root domain.
yes
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The recommended limit of DCs per domain as per Microsoft is 1200
Outbound replication is when a domain controller transmits replication information to other domain controllers on a network andInbound replication is when a domain controller receives updates to the Active Directory database from other domain controllers on the network.
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knowledge consistency checker- it generates the replication topology by specifying what domain controllers will replicate to which other domain controllers in the site. The KCC maintains a list of connections, called a replication topology, to other domain controllers in the site. The KCC ensures that changes to any object are replicated to all site domain controllers and updates go through no more than three connections. Also an administrator can configure connection objects.
the forest functional level win 2k3 interim,and win2k only do not support windows 2000 domain controllers rest does native and mixed
Three is the number of maximum hops between domain controllers
Active Directory in general uses a multimaster scheme for updating the directory databases between domain controllers, there are specific functions that can only be performed on specific domain controllers. These specific functions are assigned to one of the five FSMO roles, (pronounced "fiz-moe roles") which can be assigned to one or more Domain Controllers.