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Software-defined networking is an approach to computer networking that allows network administrators to manage network services through abstraction of higher-level functionality. This is done by decoupling the system that makes decisions about where traffic is sent from the underlying systems that forward traffic to the selected destination .
SDN requires some method for the control plane to communicate with the data plane. One such mechanism, Open Flow, is often misunderstood to be equivalent to SDN, but other mechanisms could also fit into the concept.
