Abstract
Software-Defined Networking (SDN) is a recently evolving networking architecture that focuses on the separation of control and data planes. Unlike traditional switches, SDN switches include flow tables that are remotely controlled by a separate software application, the controller. SDN is not completely new; it formulates an architecture on top of several good practices. In this paper, we examined the obtainable knowledge about SDN through conducting a systematic literature review (SLR) to evaluate the current SDN state of the art in terms of research tracks, publications, trends, etc. We systematically evaluate research in SDN based on questions formulated for this purpose. The results present outline information about the most active research areas, tools, security issues, obstacles, limitations, strengths, and opportunities in SDN.