
Explanation:
On a SND network the control plane is centralized on the the SND controller not distributed on the networking devices.
Northbound APIs do not interact with end devices. They allow the SND controller to interact with applications on the application plane.
On a SND network the management plane is not centralized, it is distributed. Network management protocols, such as Telnet, SSH, SNMP, and Syslog operate in the management plane on both traditional network and controller-based network.