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Which communication interaction takes place when a southbound API is used?
Correct Answer: B
In SDN, the southbound interface is the OpenFlow (or alternative) protocol specification. Its main function is to enable communication between the SDN controller and the network nodes (both physical and virtual switches and routers) so that the router can discover network topology, define network flows and implement requests relayed to it via northbound APIs. The northbound interface describes the area of protocol-supported communication between the controller and applications or higher layer control programs.