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  • DNS- Domain Name Server.
  • In 1983 Domain Name Server was introduced by Paul Mockapetris and Jon Postell.
  • Through internet it is a naming system for all the resources which includes physical nodes and applications.
  • It is used to locate the resource through network easily.
  • Domain Name Serveris an internet which maps the domain names to their associated IP addresses.
  • Without Domain Name Server, users must know the IP address of the web page that you wanted to access.
  • If we want to visit particular website, then the user will type the website into the address bar of the web browser.
  • Once the domain name is entered, then the domain system will translate the domain name into the IP address which can be easily interpreted by the computer.
  • The computer can locate the web page requested by the user, by using the IP address.
  • In Domain Name Server there are four servers work with each other to get the correct IP address to the client.
  • They are DNS recursor, Root nameservers, TLD nameservers, Authoritative nameservers.
  • DNS recursor also known as DNS resolver which receives the query from the DNS client and communicates with other DNS servers to find the right IP address.
  • Root nameservers answers requests by sending back a list of the authoritative nameservers that go with the correct Top-level Domain.
  • Top-level Domain nameserver keeps the IP address of the second-level domain contained within the TLD name then it releases the website’s IP address and sends the query to the domain’s nameserver.
  • Authoritative nameserver gives you the real answer to your Domain Name Server query.

    • ]]>     https://www.wikitechy.com/interview-questions/networking/what-is-dns/feed/ 0     What is DNS and DNS port number ? https://www.wikitechy.com/interview-questions/networking/what-is-dns-and-dns-port-number/ https://www.wikitechy.com/interview-questions/networking/what-is-dns-and-dns-port-number/#respond Sat, 17 Jul 2021 20:02:50 +0000 https://www.wikitechy.com/interview-questions/?p=783

    What is DNS and DNS port number ?

    • The Domain Name System (DNS) is the phonebook of the Internet. Humans access information online through domain names, like wikitechy.com. Web browsers interact through Internet Protocol (IP) addresses. DNS translates domain names to IP addresses so browsers can load Internet resources.
    • Each device connected to the Internet has a unique IP address which other machines use to find the device. DNS servers eliminate the need for humans to memorize IP addresses such as 192.168.1.1 (in IPv4), or more complex newer alphanumeric IP addresses such as 2400:cb00:2048:1::c629:d7a2 (in IPv6).
    • The DNS uses TCP Port 53 for zone transfers, for maintaining coherence between the DNS database and the server.
    What is DNS
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