Trees
A tree is a group of domains
that shares a contiguous namespace. In other words, a tree consists of a parent
domain plus one or more sets of child domains whose name reflects that of a
parent. For example, a parent domain named examcram.com can include child
domains with names such as products.examcram.com, sales.examcram.com, and
manufacturing.examcram.com. Furthermore, the tree structure can contain
grandchild domains such as america.sales.examcram.com or
europe.sales.examcram.com, and so on, as shown in Figure 1-2. A domain called
que.com would not belong to the same tree. Following the inverted tree concept
originated by X.500, the tree is structured with the parent domain at the top
and child domains beneath it. All domains in a tree are linked with two-way,
transitive trust relationships; in other words, accounts in any one domain can
access resources in another domain and vice versa.
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