Question 1,190 of 2,015

Model-Driven Telemetry →hardMultiple ChoiceObjective-mapped

350-401 Model-Driven Telemetry Practice Question

This 350-401 practice question tests your understanding of model-driven telemetry. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.

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?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

Question 1hardmultiple choice

Read the full network assurance explanation →

A
The engineer configured a sample-interval in addition to on-change, causing both periodic and on-change updates
Why wrong: On-change subscriptions do not accept a sample-interval; if configured, it would be ignored or cause an error.
B
The YANG paths include high-frequency changing leafs like interface counters or CPU load
On-change subscriptions trigger updates for any change in the monitored data, so including frequently changing leafs causes excessive updates.
C
The collector is overwhelmed and sending back-pressure signals causing retransmissions
Why wrong: Back-pressure from the collector would not cause the device to send more updates; it might cause dropped data.
D
The engineer used JSON encoding instead of GPB, causing larger payloads and more CPU usage
Why wrong: Encoding format affects payload size and CPU usage for encoding, but not the frequency of updates.

Full breakdown with real-world context →

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

The correct answer is 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.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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.
Clue confirmation
The clue words "most likely", "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
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.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 350-401 question test?

Model-Driven Telemetry — This question tests Model-Driven Telemetry — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The YANG paths include high-frequency changing leafs like interface counters or CPU load — The correct answer is 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.

What should I do if I get this 350-401 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely", "minimum / minimize". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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