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Sunday, 16 February 2020

OSI Model And 7 Layers



OSI Model:

Open Systems Interconnection (OSI) is a set of internationally recognized, non-proprietary standards for networking and for operating system involved in networking functions.
It is nothing tangible. Means that it does not perform any role in real communication.
It just defines which work will be done by which part of the network.




7 Layers





Tasks involved in sending  letter:



LAYER 7 – The APPLICATION Layer:

The top layer of the OSI model 

Provides services to user for sending and receiving data.
Allows user to gain access to network services, such as: file transfer, message handling, email reading and database query processing
All application programs work on this layer e.g. web browser and email software.



The application layer is responsible for 
providing services to the user.



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