Domain Name System
<networking> (DNS) A general-purpose distributed, replicated, data query
service chiefly used on Internet for translating hostnames into Internet
addresses. Also, the style of hostname used on the Internet, though such a name
is properly called a fully qualified domain name. DNS can be configured to use a
sequence of name servers, based on the domains in the name being looked for,
until a match is found.
The name resolution client (e.g. Unix's gethostbyname() library function) can be
configured to search for host information in the following order: first in the
local /etc/hosts file, second in NIS and third in DNS. This sequencing of Naming
Services is sometimes called "name service switching". Under Solaris is
configured in the file /etc/nsswitch.conf.
DNS can be queried interactively using the command nslookup. It is defined in
STD 13, RFC 1034, RFC 1035, RFC 1591.
BIND is a common DNS server.
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