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SDN and SD WAN and SD Access and DNA Center

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Last Modified: 2020-03-05
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.

THank you
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