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A DNS name server is a server that stores the DNS records for a domain; a DNS name server responds with answers to queries against its database.

The key functionality of DNS exploited here is that different users can simultaneously receive different translations for the same domain name, a key point of divergence from a traditional phone-book view of the DNS.The Domain Name System delegates the responsibility of assigning domain names and mapping those names to Internet resources by designating authoritative name servers for each domain.Network administrators may delegate authority over sub-domains of their allocated name space to other name servers.TXT that mapped host names to the numerical addresses of computers on the ARPANET.Maintenance of numerical addresses, called the Assigned Numbers List, was handled by Jon Postel at the University of Southern California's Information Sciences Institute (ISI), whose team worked closely with SRI. To request a hostname and an address and add a computer to the master file, users contacted the SRI's Network Information Center (NIC), directed by Elizabeth Feinler, by telephone during business hours.

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