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== Four Tiers of Active Directory ==Active Directory uses four types of divisions or container structures.* Forests: The collection of every object, its attributes and attribute syntax in the Active Directory.* Domain: A collection of computers that share a common set of policies, a name and a database of their members. * Organizational units: Containers in which domains can be grouped. They create a hierarchy for the domain and create the structure of the Active Directory's company in geographical or organizational terms.* Sites: Physical groupings independent of the domain and OU structure. Sites distinguish between locations connected by low- and high-speed connections and are defined by one or more IP subnets.