How Intersite Replication Works
The following steps, illustrated in Figure 5-2, show how intersite replication works:
1.At the interval determined by the selected replication frequency, the bridgehead server in the Zurich site polls the bridgehead server in the Lucerne site for any updated data.
2.If the bridgehead server in the Lucerne site finds that it has updated Active Directory data, it compresses the data (if larger than 50 KB) and sends it to the bridgehead server in the Zurich site.
When the bridgehead server in the Zurich site has received all of the data, it then replicates the data to the other domain controllers in the site, without compressing the information.
Note that polling and pull replication, rather than notification and push replication, are used between bridgehead servers during intersite replication. Pull replication is more efficient for intersite replication because the destination domain controller knows which replication data to request. In contrast, notification and push replication are more efficient for intrasite replication, when domain controllers are well connected and not restrained by site link schedules.
A site is a set of IP subnets connected by a highly reliable and fast link (usually a LAN). Site structure mirrors the location of 70-270 practice test user communities. Sites have two main roles: to facilitate authentication and the replication of data between sites.
The replication process ensures that changes made to a replica on one domain controller are synchronized to replicas on all other domain controllers within the domain. Creating, modifying, moving, or deleting an object triggers replication between domain controllers. Active Directory replicates information in two ways: intrasite (within a site) and intersite (between sites).
There are four types of directory partition replicas: schema, configuration, domain, and application.
A site link is a logical, transitive connection between two or more sites that mirrors the network links and allows replication to occur. By default, all site links are tran?sitive. A site link bridge connects two or more site links in a transport where tran?sitivity has been disabled in order to create a transitive and logical link between two sites that do not have an explicit site link.
A bridgehead server is a single domain controller in a free Microsoft questions site, the contact point, used for replication between sites, and is designated automatically by the KCC.
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