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Implementing an OU Structure
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Before You Begin
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To complete the lessons in this chapter, you must
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Prepare your test environment according to the descriptions given in the Getting Started section of About This Book Complete the practices for installing and configuring Active Directory as discussed in 2, Installing and Configuring Active Directory Learn to use Active Directory administration tools as discussed in 3, Administering Active Directory Complete the practices for configuring sites and replication as discussed in 5, Configuring Sites and Managing Replication
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Lesson 1
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Understanding OUs
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Lesson 1: Understanding OUs
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Understanding how OUs work is a prerequisite for the creation of OU structures and the administration of OUs. This lesson explains the reasons for defining OUs and intro duces you to the principles of OU structure.
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Identify the three reasons for defining an OU Recognize the OU hierarchy models for delegation of administration
Estimated lesson time: 10 minutes
Understanding OUs
Recall that an organizational unit (OU) is a container used to organize objects within one domain into logical administrative groups. An OU can contain objects such as user accounts, groups, computers, printers, applications, shared folders, and other OUs from the same domain. OUs are represented by a folder icon with a book inside. The Domain Controllers OU is created by default when Active Directory is installed to hold new Microsoft Windows Server 2003 domain controllers. OUs can be added to other OUs to form a hierarchical structure; this process is known as nesting OUs. Each domain has its own OU structure the OU structure within a domain is independent of the OU structures of other domains. There are three reasons for defining an OU:
To delegate administration To administer Group Policy To hide objects
Defining OUs to Delegate Administration
The primary reason for defining an OU is to delegate administration. Delegating administration is the assignment of information technology (IT) management respon sibility for a portion of the namespace, such as an OU, to an administrator, a user, or a group of administrators or users. In the Windows Server 2003 operating system, you can delegate administration for the contents of an OU (all users, computers, or resource objects in the OU) by granting administrators specific permissions for an OU on the OU s access control list. An access control list (ACL) is the mechanism for limit ing access to certain items of information or certain controls based on users identity
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Implementing an OU Structure
and their membership in various groups. Access control entries (ACEs) in each ACL determine which users or groups can access the OU and what type of access they have. ACLs and ACEs are discussed in more detail in 9, Administering Active Directory Objects.
OU Hierarchy Models for Delegation of Administration
Once you determine the OUs needed for your organization, you can add OUs to other OUs to form a hierarchy of administrative control. Hierarchies consist of one layer of OUs, called top-level OUs, under which are arranged various layers of second-level OUs. Hierarchies for delegating administration can reflect the following organizational models:
Location This structure might be used if administration within a domain is han dled by location, as shown in Figure 6-1. The top-level OUs East and West correspond to the regions set up for the contoso.com organization. The secondlevel OUs represent the physical locations of the company s four offices.
contoso.com
West
East
Kansas City
St. Paul
Chicago
Columbus
Figure 6-1 An OU structure based on location
Business function This structure might be used if administration within a domain is handled by business function, as shown in Figure 6-2. The top-level OUs Admin, Devel, and Sales correspond to contoso.com s business divisions. The second-level OUs represent the functional divisions within the business divisions.
Lesson 1
Understanding OUs
contoso.com
Admin
Devel
Sales
Acctg
Mktg
Apps
OpSys
Apps
OpSys
Figure 6-2 An OU structure based on business function
Object type This structure might be used if administration within a domain is handled by the types of objects being managed, as shown in Figure 6-3. The toplevel OUs Users, Computers, and Resources correspond to the types of objects used at contoso.com. The second-level OUs represent further detailing of the object types.
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