Domain controller replication is the process of copying data from one domain controller to another. This ensures that all domain controllers have the same data, which is critical for maintaining a healthy Active Directory environment.
There are a few different ways to check domain controller replication. One way is to use the repadmin command. The repadmin command can be used to display the replication status of a specific domain controller, or to display the replication status of all domain controllers in a domain.