NOTE Most replication among domain controllers is done over the network. This can be a problem
if it is a low-bandwidth network or if a number of domain controllers are added rapidly. For that reason,
Windows Server 2008 allows the Active Directory database files to be backed up to tape, CD, DVD,
or a removable hard disk and used as the source of an initial replication on a new domain controller
or global catalog server.
Internal Site Replication
There will always be at least one site within every AD implementation. When the first
Windows Server 2008 domain controller is installed, it creates a site called the Default-
First-Site-Name. The new domain controller then adds itself to that site. Whenever new
domain controllers are added to the network, they are automatically added to this new
site first; they can be moved later. There is, however, an exception to this statement.
When a new site is created, one or more IP subnets are assigned to that site. After there
are two or more sites, all new domain controllers added to the forest will have their IP
addresses checked and will be added to the site with a matching IP address.
Directory information within a site is replicated automatically to ensure all domain
controllers within the site have the same information. Additionally, all inter-site replication
occurs in an uncompressed format, which consumes more network traffic but less
system resources.
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