Which type of API allows an SDN controller to dynamically change the network?
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Correct answer: southbound API.
Why this is the answer
The southbound API is correct because it is the interface used by the SDN controller to communicate with and control the underlying network devices (switches, routers). This allows the controller to dynamically configure and manage the network's data plane. Northbound APIs are used by applications to communicate with the SDN controller, requesting network services or information, but they don't directly control the network devices. REST API and SOAP API are architectural styles or protocols that can be used for both northbound and southbound APIs, but they are not the type of API that defines the direction of control.
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