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For more information on Universal groups, see 9.
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1 Introduction to Active Directory Technology and Deployment Planning
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Global catalog servers are necessary for user logons if the domain is running in native mode not mixed mode because Universal groups are only supported in Native mode. Mixed mode means that Windows NT BDCs are still in use while native mode means that only Windows 2000 servers are in use.
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Users cannot logon to the network if a global catalog server is not available when the domain is running in native mode. You can learn more about mixed mode and native mode in 8.
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When installing the Active Directory for the first time, the first domain controller where you begin the installation becomes the global catalog server for the domain. You can change this role to another server if necessary.
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Multimaster roles
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Aside from the global catalog server, some domain controllers also run what is called flexible single master operation (FSMO) roles. In order to explain FSMO roles, I need to mention a few things about Windows 2000 replication (which is covered in detail in s 5 and 13). Replication is the process of sending update information to other domain controllers. Windows 2000 uses multimaster replication. Just as with the absence of a PDC, there is no single master replicator. This means that changes to the database can occur from any domain controller and that then that domain controller is responsible for letting all other domain controllers know about database changes. Imagine this scenario. Let s say you add a new user account to one domain controller. Remember that each domain controller maintains its own copy of the Active Directory database. If the domain controller does not let all other domain controllers know about the new user account, will the user be able to log on No not unless by some stroke of luck the user attempts authentication on the domain controller where the account was created. Now imagine if this happens over and over each day. Eventually, each domain controller will have a different database and a different view of the network because the domain controller would not know about database changes on all other domain controllers. Enter replication. Replication is a fairly complex process that sends changes to other domain controllers so that each domain controller can keep up with all the database changes made on different domain controllers. Without effective replication, the Active Directory would quickly become a hopeless mess of inaccurate data due to the peer domain controller design. With all that said, turn your attention back to FSMO roles. Multimaster replication works great, but for some database changes, the process does not work well. In order to solve this problem, certain domain controllers hold certain FSMO roles. This means that only those domain controllers accept certain types of database changes and perform certain functions. There are five different FSMO roles that cover the replication exceptions and process handling exceptions of multimaster replication. Table 1-1 gives you a preliminary overview of these five roles.
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Part I Planning an Active Directory Deployment
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Table 1-1 FSMO Roles
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FSMO Role Schema Master Explanation The schema master role belongs to only one domain controller in the entire forest. The schema is simply a schematic, or blueprint, of all Active Directory objects and their attributes. The schema determines what kinds of objects can be stored in the directory and what attributes define those objects. Any modifications made to the schema must be made on the domain controller holding the schema master role. The domain naming master role belongs to only one domain controller in the forest. The domain naming master controls the addition and removal of domains in the forest. The RID master manages the distribution of RID numbers to other domain controllers. When a domain controller generates a new security ID (SID) for a new user, computer, or group account, a domain security ID and a RID number are used. The RID master makes certain that no two domain controllers have the same or overlapping RID numbers. Each domain in the forest has one RID master. Windows 2000 domains that have Windows NT BDCs still in operation (mixed mode) and Windows 2000 domains that have downlevel clients (such as 9x and NT) expect a PDC to be present on the network. The PDC Emulator role is played by one domain controller in each domain to act like a Window NT PDC. The Infrastructure master role, which is held by one domain controller in each domain, updates group members as necessary. For example, when the membership of a particular group changes, the Infrastructure master updates the group to ensure that changes are processed appropriately.
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