DNS in the OSI Model

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  awitt11 Member Posts: 50 ■□□□□□□□□□

  April 2015

  DNS was created for the benefit of us slow-minded humans. Computer equipment does not need to look up/translate IP addresses when they are talking to each other. A computer network could run without DNS at all, but you would need to remember what IP address is assigned to which host.

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  TheFORCE Member Posts: 2,297 ■■■■■■■■□□

  April 2015

  niel4575 wrote: »

  Hey!
  I'm having a bit trouble with understanding where the DNS protocol is working in the OSI Model.
  From what i have understood so far, the DNS protocol is translating fx a domain name to an IP address in the application layer, but the IP address is only added to packet in the network layer - so why isn't the IP address just added in the application instead of in the network layer?
  
  I hope someone in here can help me answer the question!

  
  DNS works at the application layer. DNS is like a phonebook for the internet, it maintains the record types and does the translation between them. Network layer includes the protocols needed for communication, like IP for example. DNS is not a protocol.

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  CagePotan Member Posts: 20 ■□□□□□□□□□

  May 2015

  Like the guys above said, it's a Layer 7 (the Application layer) protocol. I suggest that you capture a DNS request with a packet analyzier like Wireshark, and you will see the DNS request. Here you have it nicely explained, the whole process:
  
  Domain Name Service (DNS)

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