The proposition of increased innovation in network
applications and reduced cost for network operators has won
over the networking world to the vision of Software-Defined
Networking (SDN). With the excitement of holistic visibility
across the network and the ability to program network devices,
developers have rushed to present a range of new SDN-compliant
hardware, software and services. However, amidst this frenzy of
activity, one key element has only recently entered the debate:
Network Security. In this article, security in SDN is surveyed
presenting both the research community and industry advances
in this area. The challenges to securing the network from the
persistent attacker are discussed and the holistic approach to
the security architecture that is required for SDN is described.
Future research directions that will be key to providing network
security in SDN are identified.
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