Most enterprises have adopted a hybrid cloud strategy, deploying applications across a range of infrastructures, including the on-premises data center, hosted private cloud, and public cloud environments. To keep up with hybrid cloud connectivity needs, a hybrid, software-defined WAN (SD-WAN) is essential. SD-WAN architecture uses software-defined networking (SDN) principles to separate the data plane from the control plane in the WAN. It abstracts the underlying transport networks (multiprotocol label switching (MPLS), Ethernet, wireless, satellite) and shifts control intelligence from customer premises equipment (CPE) or edge devices into a centralized software-based controller. A graphical user interface (GUI)-based management platform enables network administrators to define application-specific business policies, which the controller translates into routing policies enforced in the edge devices
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