350-501 Automation and Quality of Service Practice Question
An engineer is using NETCONF to retrieve the operational QoS statistics from a router. The response contains XML data but does not include the queueing statistics. What is the most likely reason?
⚠ Common exam trap
Cisco often tests the misconception that a successful NETCONF reply means all requested data is present, when in reality a missing or incorrect YANG path filter silently omits specific subtrees like queueing statistics.
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
✓
The NETCONF filter did not include the correct YANG path for QoS statistics
NETCONF retrieves data based on YANG models. If the filter does not specify the correct YANG path for QoS queueing statistics, the server will not include that data in the response. The YANG data model for QoS (e.g., Cisco‑IOS‑XE‑qos‑oper.yang) defines specific paths for queueing counters; omitting or mis‑specifying the filter path results in an incomplete reply.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The NETCONF filter did not include the correct YANG path for QoS statistics
Why this is correct
NETCONF filters are used to select specific data; omitting the path for queueing statistics results in their omission from the response.
- ✗
The user does not have enough privilege level
Why it's wrong here
Insufficient privilege would typically result in an access-denied error, not a partial response.
- ✗
The statistics are only available via SNMP
Why it's wrong here
QoS statistics can be retrieved via NETCONF if the YANG model includes them.
- ✗
The router is running an older IOS that does not support NETCONF
Why it's wrong here
Since the router responds with XML, it must support NETCONF.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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