A network application needs to query the network controller to retrieve network state information and adjust routing policies. Through which type of interface should the application communicate with the controller?
Data plane interface
Northbound interface
Southbound interface
Physical interface
The application should use a Northbound interface to communicate with the network controller. In software-defined networking (SDN) architectures, Northbound interfaces allow applications to interact with the controller by requesting data and influencing network behavior. This enables programmability and flexibility in network management. Southbound interfaces are used by the network controller to communicate with the underlying network devices, such as switches and routers, to enforce network policies. Data plane interfaces refer to the paths that carry user traffic, and physical interfaces denote actual hardware connections. Therefore, Northbound interfaces are the correct choice for application-to-controller communication.
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