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When a user logs on to the network, the global catalog provides universal group mem bership information for the account to the domain controller processing the user logon information. If there is only one domain controller in a domain, the domain controller holds the global catalog server. If there are multiple domain controllers in the network, one domain controller is configured to hold the global catalog. If a global catalog is not available when a user initiates a network logon process, the user is able to log on only to the local computer unless the site has been specifically configured to cache univer sal group membership lookups when processing user logon attempts.

Tip If a user is a member of the Domain Admins group, he or she is able to log on to the network even when the global catalog is not available.

11

The global catalog is designed to respond to user and programmatic queries about objects anywhere in the domain tree or forest with maximum speed and minimum network traffic. Because a single global catalog contains information about all objects in all domains in the forest, a query about an object that is not contained in the local domain can be resolved by a global catalog server in the domain in which the query is initiated. Thus, finding information in the directory does not produce unnecessary query traffic across domain boundaries.

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Connectivity needs that include connecting branch offices and individual users in remote locations to the corporate network, and connecting corporate networks to the Internet

13

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 Complete the practices for implementing an organizational unit (OU) structure as discussed in 6, Implementing an OU Structure Complete the practices for creating and maintaining user accounts as discussed in 7, Administering User Accounts Complete the practices for creating and administering group accounts as discussed in 8, Administering Groups Complete the practices for implementing Group Policy Objects (GPOs) as dis cussed in 10, Implementing Group Policy Complete the practices for administering GPOs as discussed in 11, Administering Group Policy Complete the practices for deploying software with GPOs as discussed in 12, Deploying Software with Group Policy

In addition, you should have experience designing a network infrastructure. Many design exercises are paper-based; however, to understand the technical capabil ities that a design can incorporate, you should have some hands-on experience with products. Where specific hands-on instruction is given, you must have at least two computers configured as specified in the Getting Started section at the beginning of this book.

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13-3

11-3

Active Directory security is determined by security groups, access control, delegation of control, and Group Policy. This lesson briefly reviews security groups, access con trol, and delegation of control, which were covered in previous chapters. Then, this lesson introduces auditing, security logging, and security configuration and analysis and discusses the security settings in Group Policy.

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Security groups simplify administration by allowing you to assign permissions and rights to a group of users rather than having to assign permissions to each individual user account. You implement security groups by using the Active Directory Users And Computers console. Security groups are discussed in 8, Administering Groups. Access control is the granting or denial of permissions to security principals. Access control is implemented by using the object-specific access control lists (ACL) in the Security tab of the Properties dialog box of each object. The list contains the names of user groups that have access to the object. Access control is discussed in 9, Administering Active Directory Objects. You delegate administrative control of domains and containers in order to provide other administrators, groups, or users with the ability to manage functions according to their needs. Delegation of control is imple mented by using the Delegation Of Control Wizard to automate and simplify the pro cess of setting administrative permissions for a domain, OU, or container. Delegation of control is discussed in 6, Implementing an OU Structure, and 9, Administering Active Directory Objects.

To design a secure client system, you must know how networks and client systems work, but you must also have an overall understanding of what needs to be done to secure clients. This foundation knowledge will help you better organize activities, pri oritize efforts, and prevent conflicts. This lesson provides that foundation knowledge.