Internetworking Models
Before when networks were new to the computer field, computers of different companies were not able to communicate with each other. Computers of same company was able to communicate but other company cannot communicate. This was a big problem for the manufacturers and the users too. There was no standard of communication devices and how the communication takes place between two computers.
So, after watching all this, ISO(International Organization for Standardization) created one model named as OSI(Open Systems Interconnection) reference model in 1970’s. So all the companies followed this standard and started manufacturing devices based on this standard. So computers from different manufactures were able to communicate. This kind of reference model describes how actually communication takes places and how the data gets transferred between two different networks. Now this OSI models are divided into different layers which we will see in next post. This is called as layered approach.
The Layered Approach
A reference model describes how to data flow from one network to another. Now this reference model is divided into various departments according to the work done by the departments or we can say groups. These groups are known as Layers. There are several processes taking place in transferring data which is handled by different layers of the model. This type of model is known as Layered Architecture.
Developers developed the model in such a way that only one layer don’t need to do whole process of the communication, but it is divided between all the layers. One layer will handle one function and other layer will handle another functions. This is how we can know about communication we study all the layers separately.
Advantages of Internetworking Models(Reference Models)
- It allows devices from different manufacturer’s to communicate
- It divides the process of communication into different layers and make it simpler to understand and to troubleshoot
- If changes are made in one layer other layers are not affected
- It defines the function for each layer and it makes easy for the manufacturer to manufacture the devices according to it
So this was all about the Reference Model and Layered Architecture.
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