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Cisco 200-301 CCNA
Question 18 of 120 • Tap an option to test: 01:14:22

What does an SDN controller use as a communication protocol to relay forwarding changes to a southbound API?

A. RESTCONF
B. OpenFlow Correct Answer
C. JSON-RPC
Verified SME Explanation:

OpenFlow is a foundational southbound API protocol used by SDN controllers to communicate directly with switches and routers in the data plane.

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