Which is true about Domain Name System (DNS)?

Q.  Which of the following is true about Domain Name System (DNS)?
- Published on 23 Sep 15

a. DNS is the client server application.
b. It uses alias names for identifying the sender and receiver instead of an IP address. So the alias address has to be mapped to the IP address.
c. It identifies sender and receiver so they should be known to each other.
d. All of the above.

ANSWER: All of the above.

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    Discussion

  • Prajakta Pandit   -Posted on 19 Oct 15

    - The Domain Name System (DNS) is a hierarchical distributed naming system for computers and services or any resource connected to the Internet or a private network.

    - DNS is the client server application. A host which wants to map a name to address or vice versa calls a DNS client named as resolver.

    - DNS uses alias names for identifying the sender and receiver instead of an IP address. So the alias address has to be mapped to the IP address.

    Importance of Domain Name System (DNS)

    - The Domain Name System distributes the responsibility of assigning domain names and mapping those names to IP addresses by designating authoritative name servers for each domain.

    - Authoritative name servers are assigned to be responsible for their supported domains and may delegate authority over sub-domains to other name servers.

    - This mechanism provides distributed and fault tolerant service and was designed to avoid the need for a single central database.

    - DNS identifies sender and receiver so they should be known to each other.

    What is the working flow of Domain Name System (DNS) ?

    - When the name <--> address mapping is necessary a host calls a resolver.

    - The resolver then accesses the closest DNS server with a mapping a request.

    - If this server has the requested information, it satisfies the resolver but if it does not have the requested information, then it refers the resolver to ask other servers to provide the information.

    - The resolver receives the mapping and then checks for an error and if it finds an error it free delivers the mapping to the requesting process.

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