KCC stands for Knowledge Consistency Checker, which is a built-in process in Active Directory (AD) that runs on each domain controller and is responsible for maintaining the replication topology. The replication topology is the network of replication connections between domain controllers, and it determines how changes made on one domain controller are replicated to other domain controllers in the same domain or forest.
The KCC is responsible for creating and maintaining the replication topology by analyzing the site and server information stored in the AD database. It uses this information to automatically create and update the replication connections between domain controllers based on the available network bandwidth and site link costs. The KCC also ensures that the replication topology is loop-free and that all domain controllers have a consistent view of the AD database.
The KCC runs every 15 minutes by default, or it can be triggered manually using the “repadmin /kcc” command-line utility. If the KCC detects a problem in the replication topology, it will automatically attempt to correct the problem by creating or modifying the replication connections between domain controllers.
In summary, the KCC is a critical component of Active Directory replication, responsible for automatically creating and maintaining the replication topology between domain controllers. By ensuring that the replication topology is consistent and optimized, the KCC helps to ensure that changes made on one domain controller are properly replicated to other domain controllers in the same domain or forest.
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