Which function describes a southbound API?
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Correct answer: Manage flow control between an SDN controller and a switching fabric.
Why this is the answer
A southbound API facilitates communication between a higher-level controller and lower-level network devices. In Software-Defined Networking (SDN), this means the SDN controller uses a southbound API (like OpenFlow) to program and manage the data plane (switching fabric). This allows the controller to dictate how traffic flows through the network. "Provision a virtual server configuration via orchestration" describes a broader orchestration function, not specifically a southbound API in the SDN context. "Automate configuration changes between a server and a switching fabric" is too generic and doesn't capture the specific controller-to-device interaction of a southbound API. "Exchange information between an SDN controller and an application" describes a northbound API, which allows applications to communicate with and request services from the SDN controller.
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