SDN and SD WAN and SD Access and DNA Center
I have read about SDN and SD WAN. if I understand They both are based on Centralized Control Plane.
So if I have the Traditional Local Area Network made up of Access/Distribution/Core Layers, and when I want to Implement SDN Technology , at what layer should I integrate SDN.
in other words if there is a hardware on which SDN is installed on, where should that hardware be located ?
SD WAN is WAN Technology , if I want to implement that technology where should I put the hardware that holds the SD WAN software.
if you can briefly give the difference between SDN , SD-Access, SD WAN, DNA Center that might also help clear up the Terminology confusion.