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The exact infrastructure design might vary because of the types of clients and the roles that they play. Computer accounts might reside in OUs created to serve geographical, departmental, or functional needs. The management of these computers might be del egated to users within these areas of the organization, and they might control or have input into the client computer security policy for their area. Where client computer security policy is based on the security policy of the organization, control over Group Policy should not be delegated at the OU level. By not delegating control over Group Policy at the OU level, you can prevent OU administrators from lowering the security of computers whose accounts are in OUs. After the OU design is completed, GPOs are designed and can be linked to each OU. Figure 11-4 shows an OU hierarchy for client computers based on geographical toplevel OUs with its respective GPOs, and Figure 11-5 shows a hierarchy created strictly by computer role.
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Windows 2000 Laptop GPO Windows 2000 Desktop GPO Windows XP Laptop GPO
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Figure 11-4 Geographical top-level OUs are often used to support local administration at distant locations.
11-8
11
Designing a Secure Client System
Enterprise
High Security
Administrative Workstation
Windows 2000
Windows XP
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Windows XP
Windows 2000 Desktop GPO for Administrators
Windows XP Windows 2000 Enterprise GPO Enterprise GPO
Windows XP High Security GPO
Windows 2000 High Security GPO
Figure 11-5 Top-level OUs designated by computer and user roles allow management of homoge nous groups
Considerations and Guidelines for Designing an OU Infrastructure for Users
Like computers, users also play roles on the network. If you have followed convention, the roles of your users are represented in Windows groups. Group Policy policies, however, do not apply to Windows groups but to OUs, and therefore to the user and computer accounts within the OUs. When designing an OU infrastructure for users, the primary consideration is manage ment of the accounts. To some, management of accounts simply means creation, deletion, user properties management, and group membership management. To oth ers, management of accounts means these things as well as complete control over the user s ability to use the computer. Unlike server role management, management of user accounts can be a political issue as well as an ease-of-management issue. The design of OUs might be up to IT administration, but the authority for controlling what users do on the desktop might not be. Your OU design must accommodate the dual needs of delegating control over user accounts and locking down the desktop accord ing to user role. These two management issues can result in an OU structure in which OUs represent each user role; that are designed around geographic location, department, or func tional area; or that simply collect user accounts into a few OUs for management pur poses. Some OU infrastructures might be a combination of these designs. Figures 11-6 through 11-9 provide examples of such OU infrastructures. In any of these cases, all user accounts within the OU might need to have the same settings applied. It might also be that this is not so. If possible, you should place user accounts that play the same role in the same OU. However, if it is not possible to use OUs as user role con tainers if, for example, users are placed in OUs by department you can filter the Group Policy policy by Windows group.
Lesson 1
Designing a Strategy for Securing Client Computers
11-9
How to Use OUs as User Role Containers
To use OUs as user role containers, determine user roles and create an OU for each role. For example, use an OU for administrators, one for users, one for managers, and one for the help desk. The deciding factor in whether or not to create another OU is whether the users need to be treated differently. Users who work the help desk, for example, might require more access to their computers than most other users. Admin istrators require the most control; clerical workers require the least control. Figure 116 shows an example of such an OU infrastructure.
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