In a software-defined architecture, where does the control plane interface with the data plane?
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Correct answer: control layer and the infrastructure layer.
Why this is the answer
In a software-defined architecture, the control plane (or control layer) is responsible for making decisions about how traffic should flow through the network. The data plane (or infrastructure layer) consists of the actual network devices (switches, routers) that forward the traffic according to the control plane's instructions. Therefore, the control layer interfaces directly with the infrastructure layer to program the forwarding rules. The application layer and management layer are higher-level concepts. The application layer consumes network services, while the management layer provides tools for network administration, but neither directly defines the control-data plane interaction.
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