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350-501 Automation and Quality of Services Practice Question

In the Modular QoS CLI (MQC), which component is used to define traffic classes based on match criteria?

⚠ Common exam trap

Cisco often tests the distinction between the component that defines traffic (class-map) versus the component that applies actions (policy-map), leading candidates to mistakenly select policy-map when asked about defining traffic classes.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

class-map

In the Modular QoS CLI (MQC), the class-map is the component used to define traffic classes by specifying match criteria such as IP precedence, DSCP values, or access-group references. The class-map groups packets that match one or more conditions, allowing the policy-map to apply QoS actions (e.g., policing, shaping) to that specific class. Without a class-map, the policy-map cannot differentiate between traffic types.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
policy-map
Why it's wrong here
Policy-map defines the actions for each class.
✗
access-list
Why it's wrong here
Access-list can be used within a class-map but is not the component for defining classes.
✓
class-map
Why this is correct
Class-map defines traffic classes with match criteria.
✗
service-policy
Why it's wrong here
Service-policy applies the policy-map to an interface.

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350-501 Automation and Quality of Services Practice Question

Why each option matters

Option-by-option breakdown

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