Which network device plane is responsible for handling QoS?

The data plane, also known as the forwarding plane, is responsible for handling the actual movement of packets through the network device, including Quality of Service (QoS). QoS involves managing and prioritizing network traffic to ensure that critical applications receive the necessary bandwidth and performance levels. The data plane processes and forwards data packets based on the policies set by the control plane.

References:

Cisco DevNet Associate Certification Guide

Cisco Networking Essentials, Chapter on Network Device Planes