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This article describes the Domain Name System (DNS) and its major components.

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DNS is the name service for Internet addresses that translates friendly domain names to numeric Internet Protocol (IP) addresses. For example, "" translates to

DNS consists of the following components:

  • Domains: A domain is a logical group of computers in a large network. Access to each computer in a given group is controlled by the same server.

  • Distributed Database: A distributed database is an archive of information about the computers in a network.

  • Name Servers: A name server contains address information about other computers on the network. This information can be given to client computers that make a request to the name server.

  • Clients: A client requests information from the servers. In a domain name system, the client requests network addressing information from the name servers.

  • Resolver: A resolver provides clients with address information about other computers on the network.

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