Software defined network: Future of networking

The digital world we live in has been lead by the evolution of Internet, which has created revolution. Today almost everything is connected and accessible from anywhere, everywhere. Unfortunately, the traditional IP network system is still complex, not easily manageable and difficult to reconfigure in case of any change or fault. Software Defined Networking (SDN) is an emerging paradigm separates the network's control logic from the underlying routers and switches, promoting logical centralization of network control and introducing the ability to program the network. It has become the focus in the current information and communication technology area because of its flexibility and programmability. SDN abstracts low-level network functionalities to simplify network management. The OpenFlow protocol implements the SDN concept by abstracting network elements. It offers flexible and scalable functionality for network by decoupling the network control from forwarding devices. SDN uses a REST API (Representational State Transfer) for communication between controller and another application.