What is the purpose of a southbound API in a controller-based architecture?
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Correct answer: Facilitates communication between the controller and the networking hardware.
Why this is the answer
A southbound API in a controller-based architecture, such as Software-Defined Networking (SDN), is designed to facilitate communication between the SDN controller and the underlying networking hardware (e.g., switches, routers). It translates the high-level instructions from the controller into device-specific commands that the network devices can understand and execute. This allows the controller to program and manage the data plane. The other options describe different API types: "Facilitates communication between the controller and the applications" describes a northbound API. "Allows application developers to interact with the network" also describes a northbound API, as it exposes network services to applications. "Integrates a controller with automation and orchestration tools" typically involves northbound APIs or management plane APIs, allowing higher-level systems to interact with the controller.
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