With in a Site, a Windows server 2003 service known as the KCC automatically generates a topology for replication among the domain controllers in the domain using a ring structure.Th Kcc is a built in process that runs on all domain controllers.
The KCC analyzes the replication topology within a site every 15 minute to ensure that it still works. If you add or remove a domain controller from the network or a site, the KCC reconfigures the topology to relect the change.
KCC is Knowledge Consistency Checker, which creates the connection object that links the DCs into common replication topology and dictates the replication routes between one DC to another in Active Directory forest.
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