An engineer is configuring LLQ in a network and completes the section for identifying different DSCP markings. Which part of the configuration specifies the traffic class for LLQ?

In Cisco IOS QoS configuration, a class map is used to define a class of traffic by specifying match criteria, such as DSCP values, IP addresses, or application ports. When configuring Low Latency Queuing (LLQ), the class map identifies the specific traffic that will receive priority treatment.

A policy map defines the actions to be taken on traffic classes (e.g., applying LLQ, bandwidth limits), but it does not specify the traffic class itself; it refers to previously defined class maps.

A service policy applies a policy map to an interface, making the QoS configuration active, but it does not define the traffic classes.

An access list (ACL) can be used as a match criterion within a class map to identify traffic, but the class map itself is the component that bundles these criteria to define a traffic class.