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A DNS hierarchy is similar to the hierarchy of a computer’s
file system. At the top is the root domain consisting of a group of root servers, which service the top-level domains. These top-level domains are broken into
organizational and geographic domains. For example, geographic
domains include .uk for
the United Kingdom, .de for
Germany, and .jp for
Japan. Normally no country-specific domain is associated with the
United States. The U.S. top-level domain is split into
organizational groups, such as .com for
commercial enterprises, .gov for
government agencies, and so forth. Some of the top-level domains for
the United States are shown in Fig. 7-8. |
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