What Is a Software Defined Network?
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A Software Defined Network (SDN) is a network architecture that enables network administrators to manage network services and resources through the use of software–defined rules. An SDN separates the network control plane from the underlying physical network hardware, allowing for more granular control of the flow of traffic within the network. With SDNs, network administrators can quickly provision, monitor, and reconfigure network services without having to make changes to physical devices or manually configure individual switch settings.