What is a collection of one or more domains that share a common name space called?

• A. Forest
• B. Tree
• C. Domain
• D. OU

Answer: (A)

In Active Directory, a tree is a collection of one or more domains that share a common DNS namespace. This means they all fit under a single, continuous naming root, like root domain.example.com with domains such as sub1.root.example.com and sub2.root.example.com. The key idea is the shared, contiguous namespace across those domains within the same tree.

A forest, on the other hand, groups one or more trees and provides a single schema and configuration, but the namespaces of the trees can be separate. A domain is a single AD domain with its own namespace, and an OU is just a container inside a domain used to organize objects. So the collection described is a tree.