Security Investigation for Software Defined Network Controller

Network security is a significant area of focus for modern information technology research. Individuals and enterprises rely on networks to exchange, store, and process sensitive data. Software defined network (SDN) is a recent and emerging networking technology in various leading technological companies. The security of SDN has several aspects and categories. The control layer security is the essential layer of SDN architecture because it contains the controller device that rules the whole network. This paper investigates the security of the controller device in single and multiple scenarios. The attacks that threatened the controller and its countermeasures are addressed. The security issues of the multiple SDN controller are discussed along with their mitigating techniques. The security challenges and suggestions are provided to help further research and development in such a rapidly growing area.