Your customer asks you to assist with their traffic policy design. They want to guarantee a minimum amount of bandwidth to certain traffic classes. Which technique would you advise them to implement?

MQC provides the structured policy framework - using class maps to match traffic, policy maps to assign bandwidth guarantees, and service policies applied to interfaces - that enables CBWFQ to deliver a configurable minimum bandwidth guarantee to each defined traffic class. It is the correct Cisco mechanism for implementing per-class bandwidth guarantees rather than just rate limiting or routing-based decisions.

Committed Access Rate (CAR) is a policing tool that enforces a maximum traffic rate by dropping or remarking excess traffic; it does not guarantee a minimum amount of bandwidth to a class.

Policy-based routing (PBR) influences the forwarding path of packets based on match criteria such as ACLs or packet length but provides no QoS scheduling or bandwidth reservation capability.

Traffic shaping buffers and delays traffic to conform to a defined maximum output rate, which controls burst and peak throughput rather than reserving a minimum guaranteed bandwidth.