Software-defined networking (SDN) is a design or construct with a purpose to make networks more responsive and flexible. The goal is to improve network control by enabling engineers to respond quickly to changing business requirement through centralized control. Like SDN, SD-WAN is the shortening for software-defined networking in a wide area network (WAN). An SD-WAN simplifies the management and operation of a WAN through centralized control or by separating the networking hardware from its control mechanism.
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