The decoupled control and data plane architecture of software-defined networking(SDN), as depicted in the following figure, and in particular OpenFlow can becompared with an operating system and computer hardware. The OpenFlowcontroller (similar to the operating system) provides a programmatic interface to theOpenFlow switches (similar to the computer hardware). Using this programmaticinterface, network applications, referred to as Net Apps, can be written to performcontrol and management tasks and offer new functionalities. The control plane in SDNand OpenFlow in particular is logically centralized and Net Apps are written as if thenetwork is a single system
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