What is knowledge consistency checker?

Answer 1

The Knowledge Consistency Checker (KCC) is a Windows component that automatically generates and maintains the intra-site and inter-site replication topology. You can disable the KCC's automatic generation of intra-site or inter-site topology management, or both. You can use the script included in this article to automate disabling or the re-enabling of automatic inter-site topology maintenance that the KCC performs.

For additional information go to http://support.microsoft.com/kb/245610

Answer 2

Within 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. The 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.