200-901 Network Fundamentals Practice Question
In Software-Defined Networking (SDN), which interface is used for communication between the controller and the network devices (e.g., switches) to forward traffic?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Southbound API
The southbound API (e.g., OpenFlow, NETCONF) is used to communicate between the SDN controller and the data plane devices.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Northbound API
Why it's wrong here
Northbound API is between applications and controller.
- ✗
Control plane
Why it's wrong here
Control plane is a logical function, not an interface.
- ✓
Southbound API
Why this is correct
Southbound API communicates with devices.
- ✗
East-West API
Why it's wrong here
East-West is between controllers.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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