Question 1,190 of 1,420
hardMultiple ChoiceObjective-mapped
350-401 Practice Question: Is designing a model-driven telemetry solution…
A network engineer is designing a model-driven telemetry solution for a large enterprise network with thousands of devices. The engineer wants to minimize the load on the network devices and the collector by sending data only when significant changes occur. The engineer decides to use on-change subscriptions. However, after deployment, the engineer notices that some subscriptions are sending updates too frequently, causing high CPU usage on the devices. What is the most likely reason for this excessive update frequency?
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 YANG paths include high-frequency changing leafs like interface counters or CPU load
That the YANG paths used in the subscriptions include leafs that change frequently, such as counters or timestamps, which trigger on-change updates even for minor changes. The other options are incorrect because the sample-interval is not used in on-change subscriptions; the collector load is not the cause; and the encoding format does not affect update frequency.
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 engineer configured a sample-interval in addition to on-change, causing both periodic and on-change updates
Why it's wrong here
On-change subscriptions do not accept a sample-interval; if configured, it would be ignored or cause an error.
- ✓
The YANG paths include high-frequency changing leafs like interface counters or CPU load
Why this is correct
On-change subscriptions trigger updates for any change in the monitored data, so including frequently changing leafs causes excessive updates.
- ✗
The collector is overwhelmed and sending back-pressure signals causing retransmissions
Why it's wrong here
Back-pressure from the collector would not cause the device to send more updates; it might cause dropped data.
- ✗
The engineer used JSON encoding instead of GPB, causing larger payloads and more CPU usage
Why it's wrong here
Encoding format affects payload size and CPU usage for encoding, but not the frequency of updates.
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Last reviewed: Jun 18, 2026
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