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Part I: Windows Server 2008 Active Direc... > Active Directory Domain Services Rep...

Chapter 4. Active Directory Domain Services Replication

In this chapter:
AD DS Replication Model96
Replication Process97
Replicating the SYSVOL Directory105
Intrasite and Intersite Replication106
Replication Topology Generation111
Configuring Intersite Replication122
Troubleshooting Replication133
Summary137
Best Practices137
Additional Resources138


In almost all cases, when you deploy an Active Directory Domain Services (AD DS) domain in Microsoft Windows Server 2008, you should deploy more than one domain controller. Deploying multiple domain controllers in each domain is the easiest and most effective way to provide high availability for the domain controller services. These domain controllers might all be located in one data center at the company head office where they are connected by very fast network connections. Or they might be spread across many locations around the world, with a variety of wide area network (WAN) connections linking the company locations.

Regardless of how many domain controllers a company has or where those domain controllers are located, they must replicate information with each other. If they cannot replicate the information, the directories on the domain controllers will become inconsistent. For example, if a user is created on one domain controller, and that information is not replicated to all the other domain controllers, the user will only be able to authenticate to the domain controller where the account was created.

This chapter describes the process of replication in AD DS. The focus of this chapter is on how replication works; that is, on how the replication topology is created and how domain controllers replicate with each other. By default, when you install AD DS domain controllers, they automatically begin replicating with each other. This default replication topology may not be the most efficient for your organization, so this chapter describes ways that you can modify the replication configuration to meet your company requirements. In addition, this chapter provides guidance on how to troubleshoot AD DS replication.

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