350-701 Question #249: Real Exam Question with Answer & Explanation

Question

With which components does a southbound API within a software-defined network architecture communicate?

Options

• Acontrollers within the network
• Bapplications
• Cappliances
• Ddevices such as routers and switches

Explanation

This question asks to identify the components with which a southbound API interacts in a Software-Defined Network (SDN) architecture.

Common mistakes.

• A. Southbound APIs facilitate communication from the controller to devices, not typically between controllers or within the controller itself.
• B. Applications communicate with the SDN controller using northbound APIs to request network services and resources, not directly with southbound APIs.
• C. While appliances can be considered network devices, 'devices such as routers and switches' (choice D) provides a more precise and encompassing description of the components controlled by southbound APIs in an SDN context.

Concept tested. Southbound API function in SDN

Reference. https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-731362.html

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