Which statement correctly compares traditional networks and controller-based networks?
A . Only traditional networks offer a centralized control plane
B . Only traditional networks natively support centralized management
C . Traditional and controller-based networks abstract policies from device configurations
D . Only controller-based networks decouple the control plane and the data plane
Answer: D
Explanation:
Most traditional devices use a distributed architecture, in which each control plane is resided in a networking device. Therefore they need to communicate with each other via messages to work correctly.
In contrast to distributed architecture, centralized (or controller-based) architectures centralizes the control of networking devices into one device, called SDN controller -> Answer D is correct.