Replication Rings and Directory Partitions

The knowledge consistency checker (KCC) is responsible for generating the intrasite replication topology, and the ISTG uses the KCC to generate the intersite replication topology. The KCC always configures the replication topology so that each domain controller in a site has at least two incoming connections if possible, as already discussed. The KCC also always configures intrasite replication so that each domain controller is no more than three hops from any other domain controller. This also means that maximum replication latency, the delay in replicating a change across an entire site, is approximately 45 seconds for normal replication.

When there are two domain controllers in a site, each domain controller ...

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