489bc932   
   From: boite-a-spam@plouf.fr.eu.org   
      
   Hello,   
      
   Prasad a écrit :   
   >   
   > I have a query on the working of DNS.   
   >   
   > Here is the text copied from the book Computer Networking: A Top-Down   
   > Approach Featuring the Internet by James F. Kurose and Keith W. Ross   
   >   
   > 'When a local name server cannot immediately satisfy a query from a   
   > host (because it does not have a record for the hostname being   
   > requested), the local name server behaves as a DNS client and queries   
   > one of the root name servers.'   
      
   That is not always true.   
      
   > In my opinion Local Name Server (LNS) should not contact Root Name   
   > Server (RNS) directly and instead it should contact Authoritative Name   
   > Server (ANS).   
      
   Yes, but in the process of identifying the relevant authoritative name   
   servers for the requested domain name, the "local" (recursive) name   
   server may need to contact a root server, then a relevant authoritative   
   name server for the TLD, and so on. But it may skip some steps when it   
   already learnt the relevant information from previous queries.   
      
   > As the DNS follows the hierarchical structure of arrangement, I guess   
   > each Local Name Server would come under some Authoritative Name   
   > Server.   
      
   Huh ? Why ? Recursive (what you call local) and authoritative name   
   servers are totally different functions.   
      
   > Hence in my opinion LNS, instead of contacting Root Name   
   > Server, should contact local Authoritative Name Server. If the local   
   > ANS does not have mapping then, it could forward the query to RNS.   
      
   An authoritative-only name server does not forward queries. It just   
   answers with its own data. Of course a server can be both authoritative   
   and recursive.   
      
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