Which interface connects controller software to agent code on a network device?
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Correct answer: Southbound interface.
Why this is the answer
The southbound interface connects the controller (control plane) to the network devices (data plane) where the agent code resides. This interface allows the controller to program the forwarding behavior of the network devices. Northbound interfaces connect the SDN controller to applications and orchestration systems, allowing them to request network services. Software virtual interfaces (SVIs) are logical interfaces on a Layer 3 switch for VLAN routing, not for controller-to-device communication. Tunnel interfaces encapsulate traffic to create virtual links over an underlying network, which is a different function.
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