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What is the authorative and non authorative DNS RRS feed

  • Question

  • Hi,

    What is the authorative DNS and what is the non authorative DNS?

    Please, explain me in easy words because my English is not so good.

    Sunday, February 20, 2011 7:25 AM

Answers

  • Authoritative DNS

    Any DNS server that contains a complete copy of the domain's zone file is considered to be authoritative for that domain. A complete copy of a zone file must have:

    • a valid Start of Authority (SOA) record,
    • valid Name Server (NS) records for the domain, and
    • the listed NS records should match the servers listed in the SOA record

     

    Non Autoritative DNS

    Non Authoritative servers do not contain copies of any domains. Instead they have a cache file that is constructed from all the DNS lookups they have performed in the past for which they have gotten an authoritative response.


    http://www.virmansec.com/blogs/skhairuddin
    • Proposed as answer by Meinolf Weber Sunday, February 20, 2011 9:12 PM
    • Marked as answer by Bruce-Liu Thursday, March 3, 2011 11:38 AM
    Sunday, February 20, 2011 7:30 AM
  • In addition to Syed.

    Brent Hu explained in one article.

    1. what is authoritative dns serve?
    An authoritative name server is a name server that gives answers that have been configured by an original source, for example, the domain administrator or by dynamic DNS methods, in contrast to answers that were obtained via a regular DNS query to another name server. An authoritative-only name server only returns answers to queries about domain names that have been specifically configured by the administrator.An authoritative name server can either be a master server or a slave server. A master server is a server that stores the original (master) copies of all zone records. A slave server uses an automatic updating mechanism of the DNS protocol in communication with its master to maintain an identical copy of the master records.

    2.what is non-authoritative dns serve?
    Non authoritative name servers do not contain copies of any domains. Instead they have a cache file that is constructed from all the DNS lookups it has performed in the past for which it has gotten an authoritative response. When a non-authoritative server queries an authoritative server and receives an authoritative answer, it passes that answer along to the querier as an authoritative answer. Thus, non-authoritative servers can answer authoritatively for a given resolution request. However, non-authoritative servers are not authoritative for any domain they do not contain specific zone files for. Most often, a non-authoritative server answers with a previous lookup from its lookup cache. Any answer retrieved from the cache of any server is deemed non-authoritative because it did not come from an authoritative server.

    Thanks

    • Proposed as answer by Meinolf Weber Sunday, February 20, 2011 9:12 PM
    • Marked as answer by Bruce-Liu Thursday, March 3, 2011 11:38 AM
    Sunday, February 20, 2011 9:10 AM

All replies

  • Authoritative DNS

    Any DNS server that contains a complete copy of the domain's zone file is considered to be authoritative for that domain. A complete copy of a zone file must have:

    • a valid Start of Authority (SOA) record,
    • valid Name Server (NS) records for the domain, and
    • the listed NS records should match the servers listed in the SOA record

     

    Non Autoritative DNS

    Non Authoritative servers do not contain copies of any domains. Instead they have a cache file that is constructed from all the DNS lookups they have performed in the past for which they have gotten an authoritative response.


    http://www.virmansec.com/blogs/skhairuddin
    • Proposed as answer by Meinolf Weber Sunday, February 20, 2011 9:12 PM
    • Marked as answer by Bruce-Liu Thursday, March 3, 2011 11:38 AM
    Sunday, February 20, 2011 7:30 AM
  • In addition to Syed.

    Brent Hu explained in one article.

    1. what is authoritative dns serve?
    An authoritative name server is a name server that gives answers that have been configured by an original source, for example, the domain administrator or by dynamic DNS methods, in contrast to answers that were obtained via a regular DNS query to another name server. An authoritative-only name server only returns answers to queries about domain names that have been specifically configured by the administrator.An authoritative name server can either be a master server or a slave server. A master server is a server that stores the original (master) copies of all zone records. A slave server uses an automatic updating mechanism of the DNS protocol in communication with its master to maintain an identical copy of the master records.

    2.what is non-authoritative dns serve?
    Non authoritative name servers do not contain copies of any domains. Instead they have a cache file that is constructed from all the DNS lookups it has performed in the past for which it has gotten an authoritative response. When a non-authoritative server queries an authoritative server and receives an authoritative answer, it passes that answer along to the querier as an authoritative answer. Thus, non-authoritative servers can answer authoritatively for a given resolution request. However, non-authoritative servers are not authoritative for any domain they do not contain specific zone files for. Most often, a non-authoritative server answers with a previous lookup from its lookup cache. Any answer retrieved from the cache of any server is deemed non-authoritative because it did not come from an authoritative server.

    Thanks

    • Proposed as answer by Meinolf Weber Sunday, February 20, 2011 9:12 PM
    • Marked as answer by Bruce-Liu Thursday, March 3, 2011 11:38 AM
    Sunday, February 20, 2011 9:10 AM
  • http://social.technet.microsoft.com/Forums/en-US/winservergen/thread/89bd7e00-17b1-4fba-a2f2-1f6191d4a1c3

     


    Chazzie / IT Manager
    Advanced Door Controls, Inc.

    Sunday, February 20, 2011 10:42 PM