DNS Is a Hierarchic, Distributed Database
DNS's hierarchy is the result of two things. The most obvious is the domain names, such as www.amazon.com. This is a hierarchic name that is read from left to right. Rightmost is com, which is one of the many hundreds of top-level domains, or TLDs. Of these TLDs, com, edu, and org are the most well-known, but many, many others exist—one for each nation and territory on the planet. The International Standards Organization (ISO) has a standard for two-letter country codes called ISO-3166. The Internet authorities simply adopted these codes as names for these national domains. Under each TLD several more domains exist, such as amazon in our example. In addition, within the amazon domain, you find several ...
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