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DNS
is the Domain Name System. DNS converts machine names to the IP
addresses that
all machines on the net have. It translates (or
"maps") from name to address and from address
to name, and
some other things. A mapping is simply an association between two
things,
in this case a machine name, like ftp.domainname.org, and the
machine's IP number
(or address) 192.168.X.X. DNS also contains
mappings the other way, from the IP number
to the machine name; this
is called a "reverse...