Table of Contents
Question
What are two functionalities of SDN southbound APIs? (Choose two.)
A. Southbound APIs from the interface between the SDN controller and business applications.
B. Application layer programs communicate with the SDN controller through the southbound APIs.
C. OpenFlow is a standardized southbound API protocol used between the SDN controller and the switch.
D. Southbound APIs form the interface between the SDN controller and the network switches and routers.
E. Southbound APIs provide a programmable interface for applications to configure the network.
Answer
C. OpenFlow is a standardized southbound API protocol used between the SDN controller and the switch.
D. Southbound APIs form the interface between the SDN controller and the network switches and routers.
Explanation
The correct answers are C and D.
C. OpenFlow is a standardized southbound API protocol used between the SDN controller and the switch. This is true because OpenFlow defines the way the SDN controller should interact with the forwarding plane to make adjustments to the network, so it can better adapt to changing business requirements.
D. Southbound APIs form the interface between the SDN controller and the network switches and routers. This is true because southbound APIs enable SDN controllers to interact with network devices using standardized protocols, such as OpenFlow and REST, and perform specific actions based on network conditions.
The other options are incorrect because:
A. Southbound APIs form the interface between the SDN controller and business applications. This is false because this is the role of northbound APIs, not southbound APIs. Northbound APIs define the way the SDN controller should interact with the application plane, which includes business applications and services.
B. Application layer programs communicate with the SDN controller through the southbound APIs. This is false because application layer programs communicate with the SDN controller through the northbound APIs, not southbound APIs. Northbound APIs provide a programmable interface for applications to configure the network.
E. Southbound APIs provide a programmable interface for applications to configure the network. This is false because this is also the role of northbound APIs, not southbound APIs. Southbound APIs provide a means for network controllers to manage network devices and route network traffic based on network conditions.
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