Quick Answer
The answer is the class, shape, and police YANG data nodes. These three nodes are defined within the Cisco-IOS-XR-qos-ma-cfg module to construct a QoS policy-map, where class identifies the traffic class via a class-map, shape enforces traffic shaping on that class, and police applies traffic policing actions. On the Cisco SPCOR / CCNP Service Provider Core 350-501 exam, this tests your ability to distinguish between configuration data nodes and operational state nodes within the YANG model for IOS-XR QoS. A common trap is confusing the police node with the policy-map container itself, or assuming that bandwidth is a top-level node—it is actually nested under class. Remember the memory tip: “Class, Shape, Police” are the three core action-oriented nodes that directly modify traffic behavior within a policy-map, while other nodes like bandwidth or queue-limit are sub-nodes under class.
This 350-501 practice question tests your understanding of automation and quality of service. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which THREE YANG data nodes are part of the Cisco-IOS-XR-qos-ma-cfg module for defining a QoS policy-map? (Choose three.)
class
Correct: The 'class' node groups match and actions.
urn:cisco:params:xml:ns:yang:Cisco-IOS-XR-qos-ma-cfg
Why wrong: This is the module namespace, not a data node.
shape
Correct: Defines shaping parameters.
police
Correct: Defines policing parameters.
interface
Why wrong: This belongs to the interfaces module.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
class
Option A is correct because the 'class' YANG data node is defined in the Cisco-IOS-XR-qos-ma-cfg module to specify a traffic class within a QoS policy-map. This node allows you to associate a class-map with the policy, enabling differentiated treatment of traffic based on classification criteria.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
class
Why this is correct
Correct: The 'class' node groups match and actions.
Related concept
Read the scenario before looking for a memorised answer.
urn:cisco:params:xml:ns:yang:Cisco-IOS-XR-qos-ma-cfg
Why it's wrong here
This is the module namespace, not a data node.
shape
Why this is correct
Correct: Defines shaping parameters.
Related concept
Read the scenario before looking for a memorised answer.
police
Why this is correct
Correct: Defines policing parameters.
Related concept
Read the scenario before looking for a memorised answer.
interface
Why it's wrong here
This belongs to the interfaces module.
Common exam traps
Cisco often tests the distinction between YANG data nodes and module metadata (like namespace URIs), tricking candidates into selecting the namespace as a valid data node when it is merely a module identifier.
Detailed technical explanation
The Cisco-IOS-XR-qos-ma-cfg module models QoS policy-map configuration using YANG, where the 'class' node contains child nodes like 'shape' and 'police' for traffic shaping and policing actions. Under the hood, these nodes map to the policy-map class configuration in IOS-XR, allowing operators to programmatically define hierarchical QoS policies via NETCONF or RESTCONF, which is critical for automated network provisioning in large-scale deployments.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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Automation and Quality of Service — study guide chapter
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FAQ
Automation and Quality of Service — This question tests Automation and Quality of Service — Read the scenario before looking for a memorised answer..
The correct answer is: class — Option A is correct because the 'class' YANG data node is defined in the Cisco-IOS-XR-qos-ma-cfg module to specify a traffic class within a QoS policy-map. This node allows you to associate a class-map with the policy, enabling differentiated treatment of traffic based on classification criteria.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 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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