Traditional Networking is made up of a control plane, and data plane where the control and data planes are combined each into the network elements making up the network. This creates a limitations, because the control plane, and data plane normally resides in the individual routers and switches. Any changes in the network topology (ie: links or routing/switching devices going up/down) will have to be communicated to the other network elements. This causes a propagation delay that gets longer as the network grows. A new set of networks known as programmable networks have emerged as a solution to this problem.
What You Need to Know - These basic networking concepts will be foundation from which we will build on:
The Open Systems Interconnection (OSI) model defines seven different functional layers:physical data link network transport session presentation application
This model allows network engineers and network vendors to easily discuss and apply technology to a specific OSI level.