DNS Fundamentals
DNS works in a hierarchical fashion with the root at the top. Queries cascade down through the branches until a server is found that can provide a resolution. The collection of machines that use DNS is called the namespace. The namespace is made up of a number of domains, each consisting of a number of machines that contain information about hosts, or of other servers that might contain the required information. The domains are organized in a similar way to a Unix file system, which is an inverted tree, with a root at the top and numerous branches extending from the root.
Top-Level Domains
If you are connected to the Internet, then the root domain is the highest level of domain, identified by a . (dot). It is often called the ...
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