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Overview of Active Directory Service
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A forest is a group of one or more domain trees.
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Forests have the following characteristics:
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All trees in a forest share a common schema. Trees in a forest have different naming structures, according to their domains. All domains in a forest share a common Global Catalog. Domains in a forest operate independently, but the forest enables communication across the entire organization.
A forest is the outermost boundary of Active Directory; the directory cannot be larger than the forest. However, you can create multiple forests and then create trust relationships between specific domains in those forests; this process would let you grant access to resources and accounts that are outside of a particular forest.
On the CD
At this point, you should view the multimedia presentation The Logical Structure of Active Directory, which is included in the Multimedia folder on the CD accompanying this book. This presentation will help deepen your understanding of Active Directory.
Real World
Using a Simple Structure
What with domains, trees, forests, and OUs, you can see how enticing it could be to try to use all these components to organize your Active Directory implementation. However, you are best served by keeping your design as simple as your organizational needs allow. The details involved in designing and implementing an Active Directory setup are challenging enough without unnecessary complication. If you can work with a single domain and a couple of OUs to help organize administrative tasks, then do it. The whole purpose of Active Directory is to ease the burden of administration. A simple, well-thought-out design goes a long way toward achieving this purpose.
Lesson 1
Overview of Active Directory
14-9
Physical Structure of Active Directory
The physical components of Active Directory, domain controllers and sites, are used to mirror the physical structure of an organization.
Domain Controllers
A domain controller is a computer running Windows 2000 Server or Windows Server 2003 that stores a replica of the domain directory (local domain database). You can create any number of domain controllers in a domain. Each domain controller in a given domain has a complete replica of that domain s directory partition. Domain controllers locally resolve queries for information about objects in their domain and refer queries regarding information they do not hold to domain controllers in other domains. Domain controllers also manage changes to directory information and are responsible for replicating those changes to other domain controllers. Because each domain controller holds a full replica of the directory partition for their domain, domain controllers follow what is known as a multimaster model: Every domain controller holds a master copy of the partition that can be used to modify that information. The functions of domain controllers include the following:
Each domain controller stores a complete copy of all Active Directory information for that domain, manages changes to that information, and replicates those changes to other domain controllers in the same domain. Domain controllers in a domain automatically replicate all objects in the domain to each other. When you perform an action that causes an update to Active Directory, you are actually making the change at one of the domain controllers. That domain controller then replicates the change to all other domain controllers within the domain. You can control replication of traffic between domain controllers in the network by specifying how often replication occurs and the amount of data that Active Directory replicates at one time. Domain controllers immediately replicate certain important updates, such as the disabling of a user account. Active Directory uses multimaster replication, in which no one domain controller is the master domain controller. Instead, all domain controllers within a domain are peers, and each domain controller contains a copy of the directory database that can be written to. Domain controllers can hold different information for short periods of time until all domain controllers have synchronized changes to Active Directory.
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