OSI Model // and his Seven Layers:

OSI Model stand for Open System Interconnection. It has been developed by 

International Organization of Standardization, in the year 1984. It is a

7 layers architecture with each layer having specific functionality to 

perform all there 7 layers work collaboratively to transmit the data form one 

person another across the globe.

          

1.Physical Layer- The lowest layer of the OSI model is the physical layer. It's 

          responsible for the actual physical connection between the devices. The 

          The physical layer contains information in the form of bits.

                                        1100 0111 0011
2.Data Link Layer- The data link layer is responsible for the node to node 

          delivery of the massage. The main function of this layer is to make sure  

         data transfer is error free from one node to another over the 

          physical layer. 

3.Network Layer- The network layer is responsible for packet forwarding including             routing through intermediate routers.

4.Transpor Layer- The transport layer segment and reassembles data into a data

          stream. Services looked in the Transport layer segment and form upper-

          layer application and unite it onto the same data stream.

5.Session Layer- The session layer is responsible for setting up, managing and

         then tearing down session between Presentation- layer entities. The layer 

         also provide dialogue control between device, or node.

6.Presentation Layer- Presentation layer is also called the Translation Layer.                 The data from the Application layer is extracted here and manipulated as par            the required format to transmit over the network.

7.Application Layer- At the very top of OSI reference model stack of layer, we find            Application Layer which is implemented by the network Application. These               application produces the data, which has to be transferred over the network.             This layer also server as a window for application services to access the                  network and displaying the received information to the user. Ex- Application,            Browsers, Skype, Messenger, etc. Application layer is also called desktop                 layer.                                                           

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