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Introduction to Active Directory and Network Infrastructure
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organization is confined within a single DNS namespace. However, for organizations that use multiple DNS namespaces, your model must be able to expand outside the boundaries of a single tree. This is where the forest comes in.
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Forests
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A forest is a group of one or more domain trees that do not form a contiguous namespace but may share a common schema and global catalog. There is always at least one forest on a network, and it is created when the first Active Directory enabled computer (domain controller) on a network is installed. This first domain in a forest, called the forest root domain, is special because it holds the schema and controls domain naming for the entire forest. It cannot be removed from the forest without removing the entire forest itself. Also, no other domain can ever be created above the forest root domain in the forest domain hierarchy. Figure 1-2 shows an example of a forest with two trees. Each tree in the forest has its own namespace. In the figure, microsoft.com is one tree and contoso.com is a second tree. Both are in a forest named microsoft.com (after the first domain created).
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research. microsoft.com
sales. microsoft.com
sales. contoso.com
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Figure 1-2 Trees in a forest share the same schema, but not the same namespace.
A forest is the outermost boundary of Active Directory; the directory cannot be larger than the forest. However, you can create multiple forests and then create trust relationships between specific domains in those forests; this would let you grant access to resources and accounts that are outside of a particular forest.
Lesson 1
Active Directory Overview
Organizational Units
Organizational Units (OUs) provide a way to create administrative boundaries within a domain. Primarily, this allows you to delegate administrative tasks within the domain. Prior to the introduction of the Active Directory, the domain was the smallest container to which you could assign administrative permissions. This meant that giving a group of administrators administrative control over particular resources was difficult or impossible to do without giving them sweeping permissions throughout the domain. OUs serve as containers into which the resources of a domain can be placed. You can then assign administrative permissions on the OU itself. Typically, the structure of OUs follows an organization s business or functional structure. For example, a relatively small organization with a single domain might create separate OUs for departments within the organization. You can even nest OUs (create OUs inside other OUs) for further control. However, an overly complicated OU structure within a domain has its drawbacks. For one thing, the simpler you keep your structure, the simpler the implementation and management of that structure. For another, once you go beyond about 12 OUs deep in a nesting struc ture, you start running into significant performance issues.
Trust Relationships
Since domains represent security boundaries, special mechanisms called trust relationships allow objects in one domain (called the trusted domain) to access resources in another domain (called the trusting domain). Windows Server 2003 supports six types of trust relationships:
Parent and child trusts Tree-root trusts External trusts Shortcut trusts Realm trusts Forest trusts
Parent and Child Trusts and Tree-Root Trusts
Active Directory automatically builds transitive, two-way trusts between parent and child domains in a domain tree. When a child domain is created, a trust relationship is automatically configured between that child domain and the parent domain. This trust is two-way, meaning that resource access requests can flow from either domain to the other. In other words, both domains trust one another.
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Introduction to Active Directory and Network Infrastructure
The trust is also transitive, meaning that domain controllers in a trusted domain pass along authentication requests to domain controllers in trusting domains. The transitive nature of these trusts is illustrated in Figure 1-3. A transitive, two-way trust exists between Domain A and Domain B. Another exists between Domain B and Domain C. Since Domain A trusts Domain B and Domain B trusts Domain C, then Domain A auto matically trusts Domain C.
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