The video demystifies the concept of Quality of Service (QoS) in Cisco SD-WAN. We will begin with explanations of various aspect of QoS and its components before working our way through different QoS scenarios covering policing, shaping, classifying, queueing and rewriting. We will show two ways of configuration using Centralized and Localized Data Policies. The video finishes with a demonstration of traffic mirroring.