SDN (Software Defined Network) is a concept similar to SD-WAN, just focused on local LAN networks. It’s a virtual, programmable network that can sense that it is overloaded and use additional communication channels for different types of traffic.
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The mesh is a collection of nodes, a lighthouse, and an admin center. The user device is a node, a server is a node, cloud stack is a node, LAN access box is a node.