- A
policy-map
Why wrong: Policy-map defines the actions for each class.
- B
access-list
Why wrong: Access-list can be used within a class-map but is not the component for defining classes.
- C
class-map
Class-map defines traffic classes with match criteria.
- D
service-policy
Why wrong: Service-policy applies the policy-map to an interface.
Question 820 of 1,000
350-501 Automation and Quality of Services Practice Question
This 350-501 practice question tests your understanding of automation and quality of services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
In the Modular QoS CLI (MQC), which component is used to define traffic classes based on match criteria?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
service-policy
Why it's wrong here
Service-policy applies the policy-map to an interface.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Under the hood, a class-map can use match-any or match-all logic to combine multiple match statements (e.g., match ip dscp ef, match access-group 101). In real-world deployments, class-maps are essential for hierarchical QoS (HQoS) where a parent policy-map shapes traffic and child policy-maps apply per-class actions. A subtle behavior is that if no match is specified in a class-map, it matches all traffic (default class), which can inadvertently affect traffic if not carefully designed.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 350-501 question test?
Automation and Quality of Services — This question tests Automation and Quality of Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
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