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It covers core AD DS concepts and functionality as well as implementing Group Policies, performing backup and restore and monitoring and troubleshooting Active Directory related issues. From the physical perspective, AD DS information is stored in databases maintained on domain controllers.
Domain controllers maintain Active Directory information , service queries, make sure that the object hierarchy is in place, and ensure that changes committed to the local copies of the database are replicated to other domain controllers in the domain.
Domains may be grouped into domain trees. The domains within the tree are cascaded, similar to a typical DNS subdomain organization. All domains within any domain tree and forest have automatic, two-way transitive trust relationships, meaning that users from any domain may access resources in any other domain, provided that administrators grant appropriate access privileges on resources such as file and print servers.
Domain trees, in turn, exist within a common Active Directory forest. The main purpose of an AD forest is to form a completely independent, self-sufficient instance of directory services. AD forests are ultimate security boundaries in directory services. They are fully independent of each other and may contain as few as a single domain which also means, a single tree that consists of the same domain or as many as an organization may want to deploy and support.
That means any given forest may contain any number of trees, each of them using its own namespace. All domain trees within one domain forest are configured with two-way transitive trusts , meaning that every domain in the forest trusts any other domain in the forest.
One element that is always common for all domains within any given forest is the Active Directory schema. Automatic configuration of transitive trusts within each forest does not necessarily mean that domains and trees lose their security boundaries within their forest.
Trust relationships only make it technically possible to assign resource permissions to users located in other domains within the same forest. Windows Server introduced a forest trust concept, which makes it possible to make any domain in one forest trust any domain in another forest, using only one external trust relationship.
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