Abstract: SDN is another NW topology that gives more encourage to the overseer for dealing with the entire NW (administrations and resources) by decoupling the control plane from the information arrange and concentrate the control coherently .in this papers we presented. A comprehensive view of the SDN begins with definition then primary standards of SDN. Next, we illuminated the fundamental segments of the SDN architecture and how these segments communicate with each either. Next, we introduced ideas about the energy conservation in SDN environment and we discussed the virtualization and its significance from the perspective of the SDN.
Keywords: SDN, virtualization, openflow, NFV, TCAM, energy saving.