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Figure 7-3 Configuring AD in one of three Microsoft Management Consoles (MMCs)
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to Windows Server 2003 and 2008 But if you mix Windows 2000 with Windows Server 2003 and 2008 domain controllers in the same forest, they will operate as if they are all Windows 2000 domain controllers, and several of the AD improvements in Windows Server 2003 and 2008 will not be available When all Windows 2000 domain controllers have been upgraded to Windows Server 2003 or 2008, the functionality level can be advanced to the newer version, providing access to all the new features
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NOTE There are read-only domain controllers (RODCs) by design See Read-Only Domain Controllers later in the chapter for more information The method of operation used by AD is that of multimaster replication, which means that changes can be made to any AD server and those changes will be replicated to other servers throughout the network Within this multimaster replication scheme are a couple of important concepts that involve the first AD server installed in the domain, which is automatically configured to be both a global catalog server and an operations master
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The global catalog is a database type that is at the core of the directory services The global catalog contains a listing of the services that can be accessed within the network, and not just the local domain The global catalog can be kept on multiple domain controllers, but it always has to be installed on at least once, and by default it is always created on the first AD server installed in a new forest (The forest concept is explained later in the chapter) The configuration of the global catalog and its placement on various servers throughout the network is done through the AD Sites And Services MMC
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TIP When operating in mixed mode, all domain controllers can perform user logins independently However, when operating in native mode, a query to a global catalog server is required (because it determines a user s global group memberships) Therefore, the rules for installing multiple global catalogs within a network are very similar to those for installing additional BDCs to an NT 4 domain When installing multiple distant sites, having a global catalog server in each site will decrease the network load on WAN links otherwise used to provide user authentication Additionally, having multiple global catalog servers to distribute the network load of authentication traffic evenly across multiple servers, instead of stacking this load onto a single server to handle, is much more efficient Of course, the need for additional global catalog servers increases the network bandwidth consumed for directory synchronization
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In general, the global catalog servers within a network provide two main features: logon and querying When operating a domain in native mode, universal groups are allowed to exist within the forest Because universal groups can contain users and groups from multiple domains, the universal group cannot exist within an individual domain Therefore, the global catalog maintains the universal groups within the network as well as each group s memberships In Windows 2000 domains, this means that whenever operating a network in native mode, the AD server logging a user into the network has to query a global catalog server to determine the universal group memberships that the user may be a part of In cases in which a user logs in and a global catalog server is not available, the user will be granted access only to the local computer This avoids any potential security issues in which a global group based in the domain granted a user access to a resource that the universal group excluded the user from gaining access to In case of an emergency, however, any user account that is a member of the local domain s Domain Admin group will be allowed to log into the network In Windows Server 2008, domain controllers can cache universal group memberships that they have looked up on a global catalog server during user logon, so the next time a universal group member logs in through a particular domain controller, the membership can be confirmed locally This both reduces network traffic and provides confirmation when the global catalog server is down The second major feature provided by the global catalog, querying, is a little more obvious A large network may have numerous domains that all exist together In this case, the global catalog provides a single place for all of the network s users to reference whenever searching for specific resources The alternative to the global catalog in this instance would be the requirement for each user either to know the exact location of the resources the user wants to use, or to search each domain independently The querying feature of AD provides another main reason to have multiple global catalog servers throughout a network
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