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When I talk about how Active Directory is organized, I am referring to its logical and physical structures Physically, Active Directory is stored in each domain controller as a set of binary files that represent its underlying database Logically, you can think of the internal objects of Active Directory as nodes on a tree This tree analogy lends itself well since the smallest logical administrative boundary for Active Directory is the domain, and a domain tree is a hierarchical collection of one or more domains It s important to emphasize one or more, since a tree with only one domain is still a tree, albeit with only one node An organization of related trees is, not surprisingly, called a forest Some people get trees and forests confused: They think that two domains automatically equal a forest What makes a group of two or more different domains a tree or a forest is their direct hierarchy Figure 4-1 shows a domain tree The parent domain, Testlablocal, has a child domain called EngineeringTestlablocal, which has its own child domain called NYEngineering Testlablocal This parent/child relationship forms a tree you can clearly see by the namespace that Engineering is a branch of Testlablocal and NY is a branch of Engineering And all these domains are actually part of the Testlablocal domain tree
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Figure 4-1 A domain tree
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Figure 4-2 An Active Directory forest
Figure 4-2 shows how a forest is formed Testlablocal and UATlocal are separate, noncontiguous domains and are parents of their own respective domain trees The existence of a trust relationship between these two otherwise unrelated domains forms a forest, and in doing so, the domains can share resources between them
Trusts
By default, two-way transitive trusts are established between domains when you link them together either within a tree or when joining two or more trees to create a forest When a trust is created, resources in one domain or tree can be assigned access to resources in a different domain or tree A two-way trust that occurs by default means that resources in both domains participating in the trust can access resources in the other A one-way trust can be established if resources in Domain A need access to resources in Domain B, but you don t want resources in Domain B to have access to resources in Domain A A transitive two-way trust means that if Domain A trusts Domain B and Domain B trusts Domain C, then Domain A automatically trusts Domain C (Figure 4-3) This was made the default configuration for Active Directory trusts since it simplifies much of the administration surrounding multidomain trusts
Organizational Units
Using a domain as the smallest logical administrative boundary makes sense since Microsoft needed to provide a direct and easy migration path to allow customers to
4:
Active Directory Domain Services
2-way trust
2-way trust
Domain A
Domain B
Domain C
Domain A has a 2-way trust with Domain C
Figure 4-3 A two-way transitive trust
transition from the old NT domain model to the new Active Directory model However, unlike the old NT domain, the Active Directory domain also supports internal logical groupings organizational units (OUs) In this sense, you can think of each Active Directory domain as its own tree of objects organized into containers such as OUs If you envision Active Directory as a file system, you can think of containers such as OUs as folders within the file system Objects that aren t containers can be considered files that can be moved around into different folders depending on where you want them How does this play out in real life Depending on your organization, you may decide to create an OU for each major department in the organization, such as IT, HR, Sales, Engineering, and Finance Each of these OUs can then contain all the users, workstations, and even security and distribution groups associated with that department You can even create sub-OUs for example, you can have separate containers for user accounts and for computer accounts The key factor here is that you decide Many best practices around Active Directory are published on the Microsoft TechCenter Web site No one can tell you that it has to be done a certain way No one will know your organization better than you, so you need to take that into consideration when designing an OU structure At the end of the day, many factors come into play when planning an OU structure: Some of them might have to do with your political boundaries, while others may be directly related to the group policies you would like to implement For example, you could tie a restrictive set of policies for the Sales OU so that sales staff can perform only certain actions on their workstations, while providing a more lax policy on the IT OU so that the IT staff can perform necessary administrative functions without being locked down Also, just because OUs exist doesn t mean groups don t exist anymore Windows groups are still the primary way to group user and computer accounts You will need to make a conscious decision whether or not grouping should be performed through the creation of OUs or through some form of Windows group In some cases, using groups won t be optional For example, if you are grouping users or computers for the purpose of assigning access to resources such as a file share, you can accomplish that only via security groups
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