Question

Application program interface (API) used between application and control planes is known as:
1.Northbound API
2. Eastbound API
3.Southbound API
4.Westbound API

Answer 1

Northbound API i think its right

Answer 2

‘Application program interface’ (API) used between ‘application and control’ planes is known as Northbound API.

Answer: Option (1)

Explanation:

SDN networks are the networks which control the data processing and forwarding capabilities inside a network. It includes processes and forwards the data path. There are two interfaces namely ‘southbound interface’ and ‘northbound interface’.  

These interfaces define the communication between controllers, application and other networking systems. The Northbound interface can be defined as the connection among the application and controllers. But the second one is the communication between the physical network and the controller.