104 Microsoft Windows Server 2008 Administration
what determines the answers to these questions will be your administrative boundaries
and sometimes your geographic locations. If your organization is geographically diverse
and connected with expensive WAN links, it??™s tempting to create a different domain for
each geographic region. Although this may be the right thing to do in certain scenarios,
you can also create multiple sites within an Active Directory domain if you simply need
to manage replication traffic.
An Active Directory site effectively defines a collection of subnets that are connected
by high-speed links. This is critical in managing replication traffic since Active Directory
will try to minimize latency for intra-site (within a site) replication traffic while trying to
minimize bandwidth utilization for inter-site (between sites) replication traffic. In the real
world, that means that Active Directory will try to synchronize almost immediately for
every change you make when computers are the same site, whereas if they are located in
different sites, you can define replication parameters to control replication traffic based
on known bandwidth utilization. In your organization, if users and computers are centrally
managed, but satellite locations are connected to your main datacenter via expensive
WAN links, instead of creating multiple domains to localize traffic, you can simply
define one domain and then split it up into multiple sites, with each Active Directory site
corresponding to your geographic sites.
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