This content is 21 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.
The knowledge consistency checker (KCC) is a Microsoft Windows 2000 and Microsoft Windows Server 2003 component that automatically generates and maintains the intra- and inter-site replication topology.
Whilst the KCC generally works well, sometimes it may be necessary to prevent the KCC’s automatic generation of replication connections (a scripted method is also available).
It should be noted that manually creating Active Directory connections to tailor the replication topology increases the administrative workload as the KCC will no longer dynamically alter connections to reflect changes in the network topology or replication failures.
Further information on optimising Active Directory replication is available on the Microsoft website.