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Lesson 1
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Designing an Organizational Unit Structure
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Initially, you should create an OU structure that effectively enables delegation of administration, whether you create an object-based or a task-based design. Once you have completed this initial OU design, you should then create additional OU structures to control the application of Group Policy to users and computers and to limit the visibility of objects.
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Using OUs to Limit Object Visibility
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Some organizations require that certain objects be hidden from certain administrators or other users. Even when you deny permission to modify an object s attributes, users who have access to the container that holds the object can still see that it exists. You can hide objects from view by putting them into an OU and then limiting the users who are given the List Contents permission for that OU. This effectively makes the objects placed in that container invisible to users who do not have the List Contents permis sion. An example of this type of design is shown in Figure 4-4.
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Figure 4-4
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It s possible to use OUs to hide objects.
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4-10
4
Designing an Administrative Security Structure
Although the need to limit object visibility is a secondary concern to creating a good administrative structure, you may find that political, legal, or security considerations force you to hide objects. The best way to do this is to concentrate first on creating a good OU structure based on controlling administrative authority. Place the objects where they need to be in that OU structure. After you have done this, create new OUs that are used to hide objects inside the new structure.
Using OUs to Control Group Policy
You are going to learn more about planning Group Policy in Lesson 3, later in this chapter. In this section, however, you ll get an introduction to the third good reason for using OUs controlling the application of Group Policy. Group Policy provides a way to apply uniform configuration settings to any number of objects all at once. You can use Group Policy to define user settings such as password restrictions or computer settings. Using Group Policy involves creating an object named a Group Policy Object (GPO) that holds the configurations you want to apply. Once you have created the GPO, you can link it to a domain, site, or OU. If you apply a GPO at the site or domain level, it affects more objects than if you apply a GPO at an organizational unit level. However, you also have less control over each individual object. Although you can filter the objects that receive a GPO, filtering can result in unnecessary complications and should be relied on only occasionally instead of as a normal practice. It is much better to create a Group Policy plan that applies GPOs efficiently from the outset, and linking GPOs to OUs provides a way to effect such a plan. Creating GPOs for OUs gives you much better control over the application of Group Policy, because it eliminates the need to filter Group Policy settings. However, you ll need to plan carefully. Creating GPOs for OUs means that there are more GPOs to manage. Conflicts between GPOs can occur because organizational units can be nested and Group Policy is inherited from parent OUs; therefore, an object may have a number of GPOs applied to it based on its position in the OU hierarchy. Once you have created an OU structure based on the delegation of administrative con trol in a domain, you can create additional OUs inside that structure that control the application of group policy. For example, if you used an object-based top-level OU structure and created an OU that contains user accounts, you could divide that OU into several lower-level OUs for users who have different Group Policy requirements.
Lesson 1
Designing an Organizational Unit Structure
4-11
When you are designing an OU structure to control the application of Group Policy, there are a few guidelines you should keep in mind:
Plan an OU structure that allows the fewest GPOs possible. The more GPOs you have associated with any object, the longer it takes for users to log on to the network. Create top-level OUs based on objects or tasks and create lower-level OUs to con trol Group Policy. Create additional organizational units to avoid the need to use filters to exempt a group of users in an organizational unit from a GPO.
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