Each site must have at least one domain controller assigned to it, and these domain
controllers for a site are in charge of servicing clients that are local to the site as well as
managing replication to other sites. In addition, at least one domain controller for each
site should be configured as a GC server so that searches across the domain can be accomplished
fairly quickly while still minimizing the amount of traffic going through
the WAN link. Each site will have a domain controller that is automatically assigned the
role of a bridgehead server??”the domain controller that acts as the preferred replication
partner with other sites. With this method, changes that are made within a site can be
collected by the bridgehead server and sent once over the WAN link rather than having
every domain controller talk to every other. Likewise, if data needs to be replicated to
a site, the bridgehead server collects this new information and disperses it to the other
domain controller in the site. I use the term preferred replication partner because replication
between two sites is by no means limited to the communication between the two bridgehead
servers. You can set up links between the other domain controllers in each site and
other sites to act as secondary links. Figure 4-5 shows a simple scenario of a domain with
two Active Directory sites: one in New York and another in Los Angeles.
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