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mediumDrag & DropObjective-mapped
350-401 Hierarchical QoS (H-QoS) Practice Question
Drag and drop the steps of Hierarchical QoS (H-QoS) parent/child policy steps into the correct order, from first to last.
⚠ Common exam trap
A common trap is to create the child policy-map before defining the class-maps. Remember that class-maps must exist before they can be referenced in a policy-map.
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
✓
Create the child policy-map with class queues
In Hierarchical QoS (H-QoS), the first step is to define class-maps for traffic classification (B). Then create the child policy-map that defines per-class queuing (A). Next, create the parent policy-map that applies shaping and references the child policy (C). Apply the parent service-policy to the interface (D). Finally, verify the hierarchical policy using show policy-map (E).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create the child policy-map with class queues
Why this is correct
Incorrect order if placed before defining class-maps; the child policy-map references class-maps, so they must exist first.
- ✓
Define class-maps for traffic classification
Why this is correct
Correct first step: define class-maps to classify traffic before creating policies.
- ✓
Create the parent policy-map with shape and service-policy
Why this is correct
Correct third step: after child policy, create the parent policy that shapes and references the child.
- ✓
Apply the parent service-policy to the interface
Why this is correct
Correct fourth step: apply the parent policy to the interface.
- ✓
Verify the hierarchical policy with show policy-map
Why this is correct
Correct final step: verify the hierarchical policy.
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Last reviewed: Jun 18, 2026
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