community – In an SDN (OpenFlow), are all switches immediately related to controller?

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I discovered this query how openflow messages get routed from swap to controller? (SDN)

And within the reply it says:

In SDN networks all OpenFlow switches are immediately related to controllers.

But when that is so, then the controller ought to have many bodily interfaces, proper? But when I am not mistaken the controller is a server, and a server doesn’t have a lot bodily interfaces, proper?

So my query is, is the reply to the above query appropriate? If sure, then how is that bodily attainable?

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