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Domain Models
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The ability to replicate the SAM directory and define trust relationships between domains provides a great deal of flexibility in designing a robust and scalable infrastructure. In reality, the sky is the limit concerning domain topologies. However, there are three common domain models that may be useful in planning an environment. The simplest model is the single domain infrastructure described previously. All participating resources are members of a single domain. The domain has one PDC and may have one or more computers acting as BDCs. This model is the easiest to administer but may be awkward for large numbers of users or machines. To facilitate management of large populations of users and resources, yet maintain a single domain for the user namespace, it is possible to separate administration of the SAM directory and resources into separate domains. This model is called the master domain model, and it maintains the SAM directory. One or more resource domains are defined to manage shares. A one-way trust relationship is defined to allow users in the master domain to access the shares in the resource domains. This model supports central administration of the user namespace and allows for local administration of shares in the resource domains. In large distributed organizations, it may make more sense to partition the namespace to support localized administration of user accounts and resources. This multi-master domain model represents the opposite end of the spectrum from the single domain model. The namespace is broken up into administrative units, each with its own security policy and definitions. Trust relationships are established as needed to facilitate interoperability between domains. As mentioned in the discussion on trust, this model is the most difficult to manage and requires close coordination between domain administrators.
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Trees and Forests
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Windows 2000 builds upon the domain model by organizing domains into a hierarchical tree structure supporting both central and distributed administration (Figure 3.9). It also increases the maximum namespace size to 10,000,000 objects. Windows NT 3.5 only supports 10,000 objects and Windows NT 4.0 supports 40,000. The collection of domains and administrative policies is managed by Windows 2000 Active Directory, a combination of the legacy NT domain security architecture augmented with a set of open technologies that include Lightweight Directory Access Protocol (LDAP), Kerberos Version 5.0, and Internet-style Domain Name Service (DNS). Active Directory supports a mixed environment of Windows 2000 and Windows NT 4.0 domain controllers. Back-level clients can still log in using NT LAN Manager challenge/response authentication.
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Figure 3.9: Active Directory domain tree
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An Active Directory tree is a hierarchy of domains that represents a contiguous namespace with a common LDAP schema and Kerberos transitive trust relationships. A schema defines the attributes associated with each object in the namespace. Kerberos trust is similar to the domain trust relationships we have already described. A group of trees which share common schema and trust relationships can be grouped into a larger administrative unit called a forest. Like domains, Active Directory tree and forest information, called the global catalog, is replicated across multiple servers, but in a multimaster topology versus the primary and backup model used by domains. Active Directory augments the domain trust model by overlaying a domain tree with an independent structure called an Organizational Unit (OU) tree. An OU is a container that holds network objects including users, groups, shares, and other OUs. Individual OU security attributes are defined by the Active Directory schema. OUs provide a finer degree of administrative authority that is independent of domain boundaries. An individual domain might implement an OU tree within the domain to distribute administrative functions to subgroups in the domain. A central IT department might define a global OU that covers all domains to centralize administration of the namespace.
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