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TCP/IP Guide by Charles M. Kozierok

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TCP/IP DNS Name Resolution and Lookup Utilities (nslookup, host, and dig)

DNS is a critically important part of TCP/IP internetworks, especially the modern Internet, because it allows hosts to be accessed using easily remembered names rather than confusing numerical addresses. Two different primary types of devices are involved in the operation of DNS: DNS name servers that store information about domains and DNS resolvers that query DNS servers to transform names into addresses, as well as perform other necessary functions.

DNS resolvers are employed by Internet users on a continual basis to translate DNS names into address, but under normal circumstances, they are always invoked indirectly. Each time a user types a DNS name into a program such ...

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