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Chapter 5. Network Protocols: Real and I... > Thoughts on Using a Conceptual Model

Thoughts on Using a Conceptual Model

Now, having read about each of the OSI layers, you still might wonder why this conceptual model is even necessary. You will find that when we start discussing actual network protocols, many of them do not map perfectly to the various layers of the OSI model. First of all, a conceptual model for network communications is useful in that it provides a context for discussing how data is generated by a user and then moved from one computer to another on a network. Breaking the different events involved in network communication into subsets also makes it generally easier to discuss and understand the entire process.

Another good reason for using a layered model is that programmers can actually work on modular protocols that “hook” into the overall conceptual model without really having to worry about the protocols that exist above or below the layer that they are working at. They know that protocols exist at these layers that will get the job done.


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