Defining a Domain Hierarchy

Published: 21st February 2011
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If you've determined comptia a+ certification practice test that your company requires more than one domain, you must organize the domains into a hierarchy that fits the needs of your organization. Recall that domains in a forest share the same configuration, schema, and global catalog. As domains are placed in a hierarchy, the two-way transitive trust relationship allows the domains to share resources.
The primary difference between domain trees and forests is in their DNS name structure. All domains in a domain tree have a contiguous DNS namespace. Unless your organization operates as a group of several entities, such as a partnership or conglomerate, your network probably lends itself to a contiguous DNS namespace and you should set up multiple domains in a single domain tree in a forest. If you need to combine organizations with unique domain names, create an additional forest. You can also create additional forests to separate 220-701 test cost zones. Each tree in the forest has its own unique namespace.
In the example, the Contoso Pharmaceuticals physical structure maps to a group of domains in a domain tree. Contoso Pharmaceuticals is not a part of any other entity, nor are there any known plans for creating multiple entities in the future. There is one dedicated root domain. Therefore, Contoso Pharmaceuticals will set up its multiple domains in a single tree in a single forest, as shown in Figure 2-2.
The Active Directory infrastructure design process consists of four stages: (1) creating a forest plan, (2) creating a domain plan, (3) creating an OU plan, and (4) creating a site topology plan.

Minimize the number of domains to avoid increased management and hardware costs. Once you've named the forest root domain you cannot change it without
rebuilding the entire Active Directory tree.
There are three reasons for defining an OU: (1) to delegate administration, (2) to hide objects, and (3) to administer Group Policy. The primary reason for defining an OU is to delegate administration.
The main purpose of a site is to physically group computers to optimize network traffic. In Active Directory,
free Microsoft questions site structure mirrors the location of user communities.

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