• Active Directory uses multimaster replication. This means that Active Directory information can be changed on any domain controller, and those changes will be replicated to other domain controllers.


Read more about multimaster replication at:
http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/distrib/dsbh_rep_fgtk.mspx?mfr=true.
• An Active Directory site is defined by IP subnets. Within a site, Active Directory replication is uncontrolled. The replication process is completely automatic. Between sites, Active Directory replication is controlled by site links.

Active Directory and DNS

• One of the most common configuration problems in Active Directory networks is incorrect DNS configuration on servers and workstations.
• Active Directory stores information about domain controllers and other services in DNS. Incorrect DNS configuration can result in:
• Slow user logons
• Inability to apply group policies
• Failed replication between domain controllers