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Active Directory allows users and administrators to find objects (such as files, printers, or users) in their own domain. However, finding objects outside of the domain and across the enterprise requires a mechanism that allows the domains to act as one entity. A catalog service contains selected information about every object in all domains in the directory, which is useful for performing searches across an enterprise. The catalog service provided by Active Directory services is called the Global Catalog. The Global Catalog is the central repository of information about objects in a tree or forest, as shown in Figure 14-7. By default, a Global Catalog is created automatically on

14-16

(any) value in the result of the subquery. If the subquery result is empty or no value satisfies the comparison, it evaluates to false. The keyword SOME is a synonym for ANY.

14

the first domain controller in the first domain in the forest, and the domain controller containing the Global Catalog is known as the Global Catalog server. Using Active Directory service s multimaster replication, the Global Catalog information is replicated between Global Catalog servers in other domains.

IN This binary comparison operator can compare a list of values against the result of a subquery and evaluates to true if all values are found in

Figure 14-7

By default, the attributes stored in the Global Catalog are those most frequently used in search operations (such as a user s first and last name, logon name, and so forth) and those necessary to locate a full replica of the object. As a result, you can use the Global Catalog to locate objects anywhere in the network without replication of all domain information between domain controllers.

the result. For example, this query returns items where all bids are less than 100:

You use the Schema Manager snap-in to define which attributes are included in the Global Catalog replication process.

You can designate additional domain controllers as Global Catalog servers by using the Active Directory Sites and Services Management snap-in. When considering which domain controllers to designate as Global Catalog servers, base your decision on the capability of your network structure to handle replication and query traffic. The more Global Catalog servers you have, the greater is the replication traffic. However, the availability of additional servers can provide quicker responses to user inquiries. Every major site in your enterprise should have a Global Catalog server.

from Item i where 100 > all ( select b.amount from i.bids b )

1. 2. 3. 4.

At this point, please view the multimedia presentation The Role of Universal Groups in the Logon Process, which is included in the Multimedia folder on the CD accompanying this book. This presentation will help you understand better how Global Catalog servers are used in Active Directory.

Important Active Directory Concepts 14-17

The next query returns all the others, items with bids greater than 100:

Active Directory, like all directory services, is primarily a namespace, which is any bounded area in which a name can be resolved. Name resolution is the process of translating a name into some object or information that the name represents. The Active Directory namespace is based on the DNS naming scheme, which allows for interoperability with Internet technologies. An example namespace is shown in Figure 14-8.

Figure 14-8

from Item i where 100 <= any ( select b.amount from i.bids b )

Using a common namespace allows you to unify and manage multiple hardware and software environments in your network. There are two types of namespaces: Contiguous namespace The name of the child object in an object hierarchy always contains the name of the parent domain. A tree is a contiguous namespace. Disjointed namespace The names of a parent object and a child of the same parent object are not directly related to one another. A forest is a disjointed namespace.

The word namespace is often used. Remember that, at its simplest, a namespace is a structure (often a database) in which all objects are named similarly but are still uniquely identified.

This query returns items with a bid of exactly 100: