Authoritative DNS Servers

Every  organization with publicly  accessible hosts  ( such  as web  server and mail  several  on the  internet  must  provide  publicly accessible DNS records that map the names of those hosts to IP addresses. An organization  authoritative DNS  server house  these DNS  records. An organization can chosen to implement its own authoritative DNS server to hold  these  records alternatively the organization can pay  to have these records store  in an authorities DNS  server of some service provide. Most universities and lamp companies implement and  maintain their  own  primary  and secondary  their  own primary and secondary ( backup) authoritative DNS server.