AD replication
Healthy replication is a must for an AD environment. AD uses a multi-master database, so every domain controller in the environment should be aware of every change in an AD database. As well as this, domain controllers should also know about changes in group policies, startup scripts, preference settings, and more. When it comes to replication, it is not only the replication service that is responsible for it. There should be stable network connectivity between domain controllers. This communication media can be copper cables, fiber cables, or even a Software-Defined Network (SDN). In this section, we are going to look at how we can use the AD-integrated features to maintain healthy replication.
FRS versus DFSR
Windows Server 2000 and 2003 use FRS to replicate the SYSVOL
folder content between domain controllers. With Windows Server 2008, FRS was deprecated and Microsoft introduced DFSR for SYSVOL
folder replication: