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To help network administrators by dividing large data exchange process in smaller segments. Smaller segments are easier to understand, manage and troubleshoot. With layer approach they only have to troubleshoot the devices which are working in faulty layer.
Standardization of network components allows multiple-vendor development.
It allows different types of network hardware and software to communicate.
Dividing network in layers make network administrators life easier. They can troubleshoot issue more quickly and effectually by looking in layer that is causing issue rather than finding it entire network. It also makes learning easier.
