Which statement best describes southbound APIs?
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Correct answer: They enable communication between the controller and the network device..
Why this is the answer
Southbound APIs facilitate communication between the SDN controller and the underlying network devices (switches, routers). This allows the controller to program and manage the data plane of these devices, dictating how traffic flows. Examples include OpenFlow and NETCONF. "They communicate with the management plane" is too broad; southbound APIs are a specific type of communication within the management plane. "They use HTTP messages to communicate" is incorrect as while some southbound APIs might use HTTP (e.g., RESTCONF over HTTP), it's not universally true for all southbound APIs (e.g., OpenFlow uses its own protocol). "They convey information from the controller to the SDN applications" describes northbound APIs, which connect the controller to applications.
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