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Understanding DNS: An Essential Web Technology by Anish Joshi

Dive into the world of Domain Name System (DNS) with Anish Joshi. Learn the importance, purpose, and role of DNS in web technology, illustrated with examples. Explore the significance of DNS in sending emails and imagine a world without domain names. Discover how DNS serves as the backbone of the internet.

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Understanding DNS: An Essential Web Technology by Anish Joshi

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Presentation Transcript

  1. DNS(Domain Name System)

    Web Technology AnishJoshi
  2. Agenda Introduction to IP address Introduction of DNS Purpose of naming Pictorial example Importance of DNS Sending an Email What happen if no Domain Names. Conclusion
  3. Introduction to Ip address A numerical label that is assigned to devices participating in a computer network. The use Internet Protocol for communication between its nodes. There are mainly two types of IP adress: Ipv4 -192.168.0.1 Ipv6-2001:0db8:85a3:08d3:1319:8a2e:0370:7334
  4. Introduction of DNS The Domain Name System (DNS) is a hierarchical naming system for computers, services, or any resource connected to the Internet or a private network. Major backbone of the internet. Makes networks human friendly. For e.gwww.prime.edu.np is domain name for ip 202.52.0.9, phone book of mobile.
  5. Purpose of naming Addresses are used to locate objects. Names are easier to remember than numbers. You would like to get to the address or other objects using a name. DNS provides a mapping from names to resources of several types.
  6. Pictorial example
  7. Importance of DNS Key to obtain the resource information on certain domain. Easy to remember. Where ever your ip change you don’t have to change the domain name.
  8. Sending an Email DNS is not just used in HTTP protocol (web pages) DNS is involved in almost every protocol in use on the internet Next example is how DNS facilitates the transfer of electronic mail. Process involved in sending mail
  9. Step 1: Your PC sends the e-mail to its configured outbound mail server. A DNS request similar to the previous example is required to find the address of the mail server. Please send this message to “someone@example.com”
  10. Step 2: Your mail server follows the same intensive process to find the authoritative servers for “example.com”. Tell me the name servers for “example.com” Here are the name servers for “example.com”
  11. Step 3: Ask the “example.com” name server for the list of “Mail eXchangers (MX) for that domain. Tell me the MX’s for “example.com” The MXs are mx10.example.com and mx20.backmail.com
  12. Step 4: Select a Mail server and deliver the mail. Here is some mail for the “example.com” domain Mail accepted for delivery
  13. What happens if there is no domain names Instead of facebook we are saying 66.220.147.11 Instead of anish@prime.edu.np we might using anish@202.52.0.9. Hard to remember the ipaddressso many might not use internet
  14. Conclusion DNS is integral part in most protocols used on the internet Makes the internet human friendly for us all Is the world largest distributed database system Fits the international model perfectly In simple terms is a mapping between names and IP addresses
  15. References Internet Reference www.google.com www.wikipedia.com Book Reference Computer Networks, Fourth Edition By Andrew S. Tanenbaum (e-book) Cisco Network Slides
  16. THANK YOU
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