OSI LAYER

                            Lets look what happen when computer passes a message from a one computer to the another computer in the network.The message are converted into the packet and send to the protocol stack.The protocol stack makes the control information to the header and makes encryption,error checking,protocol sequence,reassembling.When the message arrives the physical layer,it changes to the electronic bits and reach the "COMPUTER 2" in the network

                        
                             When computer receives the message then it allows to travel the up protocol stack.This allows to decrypts,check the errors and reassemble the packets to the original message.


LAYERS IN OSI MODEL

1.   APPLICATION LAYER
2.   PRESENTATION LAYER  
3.   SESSION LAYER
4.   TRANSPORT LAYER
5.   NETWORK LAYER
6.   DATALINK LAYER 
7.   PHYSICAL LAYER