Root
The uppermost domain in a hierarchical name space such as the DNS name space is called the root. The root, which is defined as " " (nothing) or more accurately "." (a dot), is the base at which any entire-domain-tree search must be initiated.
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The uppermost domain in a hierarchical name space such as the DNS name space is called the root. The root, which is defined as " " (nothing) or more accurately "." (a dot), is the base at which any entire-domain-tree search must be initiated.