Software-defined networking (SDN) works by using software to configure and control the network, rather than relying on device-specific static configurations. The SDN model creates a centralized architecture that replaces the distributed architecture model.
How does this shift to a centralized architecture affect the three planes of network communication?
The data plane and control plane have to be combined into one data-control plane.
The planes of network communication become obsolete.
The data plane and control plane have to be separated.
The three planes are flattened into one central management plane.