How to understand OSI model in Nepali.

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https://www.youtube.com/watch?v=ImxCi2ec9qM


OSI Model:




1) Application layer: 

key word is : interaction between human using application like: browser, any application like chat software, zoom, teams etc


2) Presentation layer: 

key word - translates the date in correct format  : Like: video file:mp4, avi | audio       file: mp3, wav | image file : jpeg, png, gif etc | document file : doc,.xls, txt etc


3) Session layer: 

create and maintain the session - time | key word: = timeframe the bank website will close automatically in 5 mins. | facebook will close within 30 mins automatically. | For security we need sessions.


4) Transport layer: 

source to destination delivery of data | key word: delivery of data | TCP and UDP

         TCP : Transmission control protocol : Get Confirmation (reliable)| 3 way handshake | Phone call/ browsing the internet page. (TCP)

         UDP : User Datagram Protocol : No Confirmation (Not reliable) live radio transmission | audio, video (real  time application)


5)Network Layer: 

It is responsible to add source and destination IP address | key word : Add IP address |


6) DataLink layer: 

It is responsible to add source and destination MAC | Key word : add destination MAC address             (Router - MAC address change)


7) Physical Layer: 

wire | Key words: Cables, connectors, signals 


(All people seem to need data processing layer)

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