Osi model
Osi modelOSI is a standard description or for how messages should be transmitted between any two points on a network. The OSI model defines seven layers that take place at each end of a communication. It is also valuable as a single reference view of communication that lets everyone have a common ground for education and discussion. Developed by representatives of major computer companies beginning in 1983, OSI was made to be a detailed specification of interfaces. Instead, the committee decided to make a common reference model for which others could make detailed interfaces, that could become standards. OSI was officially adopted as an international standard by the International Organization of Standards (ISO).The main idea in OSI is that the process of communication between two end users in a network can be divided into layers, with each layer adding its own set of special, related functions. Each user is at a computer equipped with these seven layers of function. So, in a given message between users, there will be a flow of data through each layer at one end down through the layers in that computer and, at the other end, when the message arrives, another flow of data up through the layers in the receiving computer. The actual programming and hardware that makes these seven layers of function is usually a combination of the computer OS, applications, TCP/IP and the software and hardware that enable you to put a signal on one of the lines attached to your computer. OSI divides communication into seven layers. The layers are in two groups. The upper four layers are used whenever a message passes from or to a user. The lower three layers are used when any message passes through the host computer. Messages intended for this computer pass...
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