The AD database contains all information about objects in all the domains from logon
authentication to objects in the directory. A hierarchical structure made up of multiple
domains that trust each other is called a tree. A set of object definitions and their associated
attributes is called a schema. All domains in a tree will share the same schema and will have
a contiguous namespace. A namespace is a collection of domains that share a common root
name. An example of this is support.troytec.com, marketing.troytec.com, and troytec.com. ...