200-901 Network Fundamentals Practice Question
In the context of SDN, which API is used between the SDN controller and the network devices to configure forwarding behavior?
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
Southbound APIs like OpenFlow, NETCONF, or gRPC communicate from controller to 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 APIs connect applications to the controller.
- ✗
Eastbound API
Why it's wrong here
Eastbound APIs are not standard SDN terminology.
- ✓
Southbound API
Why this is correct
Correct. Southbound APIs communicate with network devices.
- ✗
REST API
Why it's wrong here
REST can be used in northbound, but not specifically southbound.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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