In a controller-based network architecture, the controller communicates with applications using a(n) ________
A) Eastbound interface
B) Southbound interface
C) Northbound interface
D) Westbound interface
C
Explanation: C) In a controller-based network architecture, communication between the controller and the networking devices is completed through a Southbound interface (SBI), and it communicates with applications (programs) using its Northbound interface (NBI).
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