This provides better return on investment on the company ??™ s
investment in Active Directory.
Active Directory Sites
An Active Directory site is defined as a collection of well - connected TCP/IP subnets. Well - connected
means reliable and fast connections, generally LAN - type connections. Active Directory sites typically
closely reflect the physical network layout. Sites are the boundaries for Active Directory replication and
they localize directory authentication.
Active Directory sites are connected by site links. Administrators can configure link cost, availability, and
other properties. Active Directory automatically builds the replication topology based on the site configuration.
Building the replication topology is the responsibility of the Knowledge Consistency Checker
(KCC). The KCC runs on all domain controllers and on 15 - minute intervals. Specifically, the Inter - Site
Topology Generator (ISTG) on one domain controller evaluates the costs and checks on new or retired
domain controllers. It passes this information to the KCC, which adds or removes connection objects to
create the most efficient replication.
On an Exchange server, it is the Microsoft Exchange Active Directory Topology service that checks the site
membership of the server against stored configuration information.
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