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MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

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14-16 Chapter 14 Overview of Active Directory Service<br />

F14us07<br />

the first domain controller in the first domain in the forest, and the domain controller<br />

containing the Global Catalog is known as the Global Catalog server. Using Active<br />

Directory service’s multimaster replication, the Global Catalog information is replicated<br />

between Global Catalog servers in other domains.<br />

DC1<br />

DC2<br />

Global<br />

Catalog<br />

Server<br />

Domain B<br />

DC3<br />

Global<br />

Catalog<br />

Figure 14-7 The Global Catalog is the central repository of information about objects in a forest.<br />

By default, the attributes stored in the Global Catalog are those most frequently used in<br />

search operations (such as a user’s first and last name, logon name, and so forth) and<br />

those necessary to locate a full replica of the object. As a result, you can use the Global<br />

Catalog to locate objects anywhere in the network without replication of all domain<br />

information between domain controllers.<br />

Note You use the Schema Manager snap-in to define which attributes are included in the<br />

Global Catalog replication process.<br />

You can designate additional domain controllers as Global Catalog servers by using the<br />

Active Directory Sites and Services Management snap-in. When considering which<br />

domain controllers to designate as Global Catalog servers, base your decision on the<br />

capability of your network structure to handle replication and query traffic. The more<br />

Global Catalog servers you have, the greater is the replication traffic. However, the<br />

availability of additional servers can provide quicker responses to user inquiries. Every<br />

major site in your enterprise should have a Global Catalog server.<br />

On the CD At this point, please view the multimedia presentation “The Role of Universal<br />

Groups in the Logon Process,” which is included in the Multimedia folder on the CD accompanying<br />

this book. This presentation will help you understand better how Global Catalog servers<br />

are used in Active Directory.

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