Mastering Active Directory - Second Edition

Intra-site replications

As the name implies, this covers the replications happening within the AD site. By default, (according to Microsoft) any domain controller will be aware of any directory update within 15 seconds. Within the site, despite the number of domain controllers, any directory update will be replicated in less than a minute:

Within the site, the replication connections are being performed in a ring topology, which means that any given domain controllers have two replication links (of course, if there are a minimum of three domain controllers). This architecture will prevent domain controllers from having endless replication ...