Network models use layers to simplify the networking functions.To understand the importance
of layering, let's consider the OSI reference model. By using layers,the OSI reference model
simplifies the tasks required for two computers to communicatewith each other.

Each layer can be focused on specific functions, allowing the networking designer to choose
the right networking devices and functions for the layer.
In the OSI reference model, each of the seven numbered layers indicate distinct functions.
The reasons for this division of network functions include the following:

-Layers divide the aspects of network operation into less complex elements.
-Layers define standard interfaces for plug-and-play compatibility.
-Layers enable engineers to specialize design on modular functions.
-Layers promote symmetry in the different network modular functions so that they work
together.
-Layers prevent changes in one area from affecting other areas, so each area can evolve
more quickly.
-Layers divide the complexity of networking into separate, easy to learn operations.

The layered network model -2/2-