SDN architecture mainly includes two interfaces: NBI northbound interface and SBI southbound interface.

Question

Options

• ATRUE
• BFALSE

• A
  26% (11)
• B
  74% (31)

Explanation

Option B is correct because SDN architecture includes three main interfaces, not two. In addition to the Northbound Interface (NBI, connecting the control plane to the application plane) and the Southbound Interface (SBI, connecting the control plane to the data/infrastructure plane), SDN also defines an East-West Interface (EWI), which enables communication and coordination between peer SDN controllers in distributed deployments.

Option A is wrong because it accepts the "two interfaces" claim at face value, overlooking the East-West Interface entirely - a common omission that makes this a tricky distractor.

Memory tip: Think of an SDN controller as sitting at the center of a compass: traffic goes North to applications, South to network devices, and East/West to neighboring controllers. Three directions = three interface types.

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