Final answer:
Software-Defined Networking (SDN) is the intelligent network architecture in which a software controller assumes the control plane functionality for all network devices. It offers centralized control and programmability, allowing for better automation, flexibility, and scalability in network management.
Step-by-step explanation:
The intelligent network architecture in which a software controller assumes the control plane functionality for all network devices is called Software-Defined Networking (SDN). SDN decouples the control plane from the data plane in a network, allowing for centralized control and programmability.
With SDN a software controller takes charge of managing and controlling network devices, such as switches and routers, through a logically centralized control plane. SDN enables better automation, flexibility and scalability in network management, making it easier to implement and manage complex networks.