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The network is changing very rapidly due to Software Defined Networking. To properly implement networks, we need many network devices like routers, switches, load balancers, firewalls and intrusion detection (IDS)/prevention (IPS). In traditional networking, these devices are very costly, inflexible & vendor specific. All these devices are made up of data plane & control plane. These planes are tightly coupled. You cannot force the vendors to sell you only the data plane so that you can use control plane of your choice. But SDN is changing this by separating the data plane & control plane. Now you can ask for the data plane from the vendor & can use open source control planes such as POX, RYU & Opendaylight. By writing network applications such as load balancer, firewall on top of these control planes, your data plane will start behaving like load balancer or firewall. Thus SDN offers us networking …