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DNS

DNS. Domain Name Systems Theory. Theory. How DNS works. How DNS Works - Theory. Domain names Arranged in a tree Cut into zones Each served by a nameserver. How DNS Works - Theory. Domain name space consists of a tree of domain names Each node or leaf in the tree

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DNS

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  1. DNS Domain Name Systems Theory

  2. Theory How DNS works

  3. How DNS Works - Theory • Domain names • Arranged in a tree • Cut into zones • Each served by a nameserver

  4. How DNS Works - Theory • Domain name space consists of a tree of domain names • Each node or leaf in the tree • Has one or more resource records • Holds information associated with the domain name • The tree sub-divides into zones • Zone consists of a collection of connected nodes • Authoritatively served by an authoritative DNS nameserver • Note that a single name server can host several zones

  5. How DNS Works - Theory • When a system administrator wants to let another administrator control a part of the domain name space within his or her zone of authority • Can delegate control to the other administrator • Splits a part of the old zone off into a new zone • Comes under the authority of the second administrator's name servers • The old zone becomes no longer authoritative for what goes under the authority of the new zone

  6. How DNS Works - Theory • Resolver looks up the information associated with nodes • Knows how to communicate with name servers • Sends DNS requests • Heeds DNS responses • Resolving usually entails iterating through several name servers to find the needed information • Some resolvers function simplistically and can only communicate with a single name server • These simple resolvers rely on a recursing name server to perform the work of finding information for them

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