Which SDN architecture component is used by the application layer to communicate with the control plane layer to provide instructions about the resources required by applications?
B (Northbound APIs):Northbound APIs allow applications to communicate with the SDN controller to express service requests and provide policy intent. The controller translates these into instructions for the underlying infrastructure.
Other options explained:
A: Southbound APIs connect controllers to forwarding devices.
C: Orchestration coordinates workflows across domains but doesn’t directly connect applications to controllers.
D: The SDN controller receives the northbound API calls but is not the API itself.
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