Part I Planning an Active Directory Deployment in Visual Studio .NET

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Part I Planning an Active Directory Deployment
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Remote Site The Active Directory uses site information to keep user traffic located within the site instead of traveling WAN links to remote sites. Figure 5-3: Site control of user traffic
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Aside from user traffic, the Active Directory also maintains sites for replication purposes. In this section, we ll examine the planning perspective of replication.
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13 provides replication information in detail.
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If you read the previous chapters in this part of the book, you are well aware that PDCs and BDCs are no longer used in Windows 2000 networks, and all domain controllers function as peers. The PDC and BDC model, although effective in many ways, caused a lot of problems in large distributed networks because the PDC was writable and the BDCs received copies of the data from the PDC. This design required that changes be made at the PDC. In Windows 2000 networks, all domain controllers have a writable copy of the Active Directory database. In other words, there is no one master domain controller or master database, but all domain controllers function as peers, maintaining their own copy of the Active Directory database. With this design, changes to the database can be made at any domain controller at any time. For example, an administrator can create a user account on one domain controller and later create another user account on a different domain controller. It does not matter which domain controller the administrator uses for configuration because any changes made to the database will be replicated to all other domain controllers. Replication, then, is the process of sending and receiving update information to ensure that all domain controllers have an exact copy of the Active Directory database. Through replication, the integrity of the Active Directory database can be ensured. For example, when an administrator creates a new user account on a domain controller, that user account will be replicated to all other domain controllers in the domain. When the user logs on to the network, the user can then be authenticated by any domain controller. As you can imagine, without replication the Active Directory database would quickly become a hopeless collection of inaccurate data. In essence, as different administrators would make different database changes on different domain controllers, each domain controller would have a different view of the network and the contents of the database. In a short amount of time, no domain controller would have accurate data. Consequently, you can see how very important replication is to the integrity of data on a network. The Active Directory defines two kinds of replication: intrasite and intersite. Intrasite replication occurs within a site, while intersite replication occurs between sites. Before you start worrying about massive replication configuration headaches, let me just put your mind at ease. The Active Directory configures its own replication topology, which is simply a series of connections, and enables database changes to reach one domain controller to the next. For intrasite replication, an Active Directory service called the Knowledge Consistency Checker (KCC) examines all of your domain controllers in a site and builds connections between them so that replication can occur automatically. In other words, you, as the administrator, do not have to configure anything. The Active Directory completely generates its own replication topology within a site and then configures how replication will work. The KCC constantly monitors the replication topology and changes it if a new domain controller is added to
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Part I Planning an Active Directory Deployment
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the domain or if one goes offline or is removed. For intrasite replication, shown in Figure 5-4, there s nothing for you to configure or manage it is all automatic.
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Within a site, the Active Directory automatically creates a replication topology so that each domain controller has at least two connections. This topology is automatically adjusted when domain controllers are down, removed, or added.
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