Which of the following correctly distinguish between northbound and southbound APIs in an SDN architecture? (Select all that apply.)
Correct Answer: A,B
Detailed Explanation: In SDN, APIs are critical for enabling communication between different layers of the architecture. Northbound APIs (Option A) provide an interface from the SDN controller to external applications, orchestration systems, and business platforms. They allow developers to query the network state, push policies, and request services without needing detailed knowledge of the underlying hardware. Southbound APIs (Option B) enable the SDN controller to communicate with the network devices (routers, switches, etc.) by pushing configuration updates and collecting data. OpenFlow is a well-known example of a southbound API protocol. Option C is incorrect because northbound APIs do not directly configure physical hardware; that is the role of southbound APIs. Option D is also incorrect because while southbound APIs may relay some analytics data, the primary purpose of exposing analytics to external applications is achieved through northbound interfaces. This clear separation of responsibilities is key to the flexibility and modularity of SDN.
This CCNA practice question helps students prepare for Cisco networking certification exams by testing knowledge of network fundamentals, routing, switching, and network security concepts.