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Connecting Clients to Windows Networks
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Windows-based computers communicate with each other on peer-to-peer networks by using a common protocol. As a result of the dominance of the Internet, TCP/IP has become the protocol of choice for peer-to-peer networks. For more information about configuring protocols for peer-to-peer networking, see TCP/IP and Other Network Protocols later in this chapter.
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A domain is a logical grouping of networked computers that share a central directory database that contains user account and security information for resources within the domain. In a domain, the directory database is stored on computers that are configured as domain controllers. A domain controller manages all security-related aspects of interactions between users and domains. Security and administration are centralized. Figure 23-2 illustrates a domain configuration. In a domain that has more than one domain controller, the domain accounts database is replicated between domain controllers within the domain for increased scalability and fault tolerance. If a domain controller becomes unavailable, directory information is still available from the other domain controllers. For more information about Windows 2000 Server domain controller placement in a Windows 2000 domain, see Designing the Active Directory Structure in the Deployment Planning Guide of the Microsoft Windows 2000 Server Resource Kit. For more information about Windows Server 2003 domain controller placement, see the Microsoft Windows Server 2003 Deployment Kit. Windows 2000 and Windows Server 2003 domains improve on Windows NT domains. In Windows 2000 and Windows Server 2003 domains, all domain controllers can receive updates to the directory database. In Windows NT domains, the single-master model allows only one domain controller to be updated, which then replicates the changes to the other domain controllers. In Windows 2000 and Windows Server 2003 domains, the directory is distributed and it uses a hierarchical namespace based on the Domain Name System (DNS). In Windows NT domains, the directory is centralized and a flat namespace is used. Windows XP Professional is fully compatible with Windows NT, Windows 2000, and Windows Server 2003 domains. For more information about whether to migrate an existing Windows NT domain to Windows 2000, see Determining Domain Migration Strategies in the Deployment Planning Guide.
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Part IV:
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Member Server
Figure 23-2
Domain-based network
Active Directory
Active Directory is the directory service included with Windows 2000 Server and Windows Server 2003. The service provides a place to store information about network-based entities (such as applications, files, printers, and users) and the means to locate and manage resources. Active Directory provides a consistent way to name, describe, locate, access, manage, and secure information about network resources. Active Directory is available only in domains with Windows 2000 based or Windows Server 2003 based domain controllers. Active Directory presents domain information in a hierarchical, object-based format and protects network data from unauthorized access. It replicates directory data across a network so that data remains available if one domain controller fails. Active Directory clients Active Directory supports clients running Windows XP Professional, Windows 2000, Windows NT, and Windows 9x. These computers can have access to shared resources within a domain to the extent allowed by the security on the resources. However, a computer that runs Windows 98, Windows 95, or Windows NT 4.0, or must have the Active Directory client software installed to search for information in Active Directory about the shared resources. Active Directory objects In Active Directory, network resources such as users, groups, and computers are represented as objects. An object is a unique namespace within the directory with object-specific attributes that represents something concrete, such as a user, a printer, or an application. An Active Directory object is defined by a set of rules, or schema. When you
23:
Connecting Clients to Windows Networks
create an Active Directory object, Active Directory generates values for some of the object s attributes, and you provide other values. For example, when creating a new user account, Active Directory automatically assigns a globally unique identifier (GUID) but requires the administrator to provide values, at least for the minimally required attributes such as the user name and the logon identifier. Organizational units An Active Directory domain can contain an organizational unit hierarchy. Organizational units are containers to which you can delegate administrative authority over sets of objects. Organizational units can also be used to apply policies to users and computers. An organizational unit can contain Active Directory objects such as users, groups, computers, printers, and shared folders as well as other organizational units. Each domain can have its own hierarchy of organizational units that implements domain-specific administration. An Active Directory organizational unit can represent a group of users, such as the marketing department, or a collection of related objects, such as printers. You can create a tree structure by nesting organizational units, objects, and containers in the same way that a Windows file system uses folders and files. Storing objects in an organizational unit allows an administrator to use Group Policy to apply restrictions to all users or all computers within that unit. Objects can still be stored in containers other than organizational units when such container-level policies are not required. Global catalog Windows 2000 Server introduced the global catalog, which provides forestwide Active Directory searches. Ordinarily, a domain controller stores objects for only one domain. A global catalog server is a special domain controller that stores complete objects for one domain and partial objects (every object but only a limited set of each object s attributes) for every other domain in the forest. The global catalog is also required for user logon. There can be multiple global catalog servers in a forest. The global catalog makes directory structures within an enterprise transparent to end users seeking information. In an enterprise that contains many domains, the global catalog allows clients to easily perform searches across all domains without having to search each domain separately. Administration tools Administrators who have the required permissions can use the Windows Server 2003 Administration Tools Pack to remotely create Active Directory objects and perform other administration tasks from a Windows XP Professional client that meets the following criteria:
The Windows Server 2003 Administration Tools Pack has been installed locally. The Windows XP Professional Client has been updated to at least Service Pack 1 or has the software update described in Knowledge Base article 329357 applied. The Windows XP Professional client is a 32-bit client. The tools support 32-bit and 64-bit server operating systems. However, the Windows Server 2003 Administration Tools Pack does not install on 64-bit systems.
Part IV:
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