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Network infrastructures have evolved in recent decades. Traditional equipment combining processing and execution capacity can no longer cope with the strong emergence of new flows and variety in the nature of traffic. The Software-defined Network (SDN) paradigm has been proposed to outsource the control plane in a dedicated device called a controller. SDN has been used among other things to improve not only network management, but also quality of service and security. In this paper we will present SDN technology as well as the role that this technology plays in improving network security.
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