CCNA Routing and Switching (legacy) — Question 20

Which two statements about northbound and southbound APIs are true? (Choose two.)

Answer options

• A. Only southbound APIs allow program control of the network.
• B. Only northbound APIs allow program control of the network.
• C. Only southbound API interfaces use a Service Abstraction Layer.
• D. Only northbound API interfaces use a Service Abstraction Layer.
• E. Both northbound and southbound API interfaces use a Service Abstraction Layer.
• F. Both northbound and southbound APIs allow program control of the network.

Correct answer: B, C

Explanation

The correct answer is B and C because northbound APIs are specifically designed for programmatic control of the network, while southbound APIs interface with the network devices. While southbound interfaces utilize a Service Abstraction Layer for better interaction with the physical devices, northbound APIs do not follow this structure, making options A, D, E, and F incorrect.