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Traditional network architectures, for example, Ethernet, are not absolutely adapted to users and, generally, don't meet their requirements. SDN (Software Defined Network) has totally changed the network architecture in terms of control and services automation. In this regard, this article presents a comparison between two technologies the first is SDN and the second is Ethernet with their scalability; the make known paper presents simulation results regarding to SDN and Ethernet performances in terms of QoS requirements (Jitter, latency, lost packets, MOS) under Omnet 4.6++.