In software-defined architecture, which place handles switching for traffic through a Cisco router?

The control plane is responsible for making forwarding decisions and programming the data plane, not for the actual switching of traffic itself.

The management plane is used for configuring, monitoring, and managing network devices, but it does not participate in the forwarding of user traffic.

The data plane, also known as the forwarding plane or infrastructure layer, is where the actual network traffic processing occurs. Devices in this plane, such as Cisco routers, perform packet forwarding, switching, and encapsulation based on the rules and instructions pushed down by the control plane.

The application plane provides high-level network services and communicates requirements to the control plane, but it does not directly handle the switching of traffic.