We are being to enter the era of software defined networking (SDN), an emerging paradigm where network control logic (learning and forwarding decisions) is decoupled from the underlying physical network topology (routers, switches). To quote from Nick Feamster who is the Darnell-Kanal Associate Professor of Computer Science at University of Maryland: Separating a network’s control logic from the underlying physical routers and switches that forward traffic allows operators to write high-level control programs that specify the behavior of an entire network, in contrast to conventional networks, whereby network operators must codify functionality in terms of low-level device configuration. Logically centralized
