- A
Periodic telemetry sends data at a configured interval regardless of whether the value has changed.
Correct because periodic subscriptions push data on a timer, ensuring consistent updates.
- B
On-change telemetry sends data only when the monitored value changes, reducing network overhead.
Correct because on-change minimizes unnecessary data transmission.
- C
A single telemetry subscription can include both periodic and on-change sensors.
Correct because Cisco IOS-XE and NX-OS allow mixing sensor paths with different update policies.
- D
On-change telemetry guarantees that every change, no matter how brief, will be reported.
Why wrong: Incorrect because on-change may use suppression timers to avoid flooding, potentially missing very short-lived changes.
- E
Periodic telemetry is always preferred over on-change for all use cases.
Why wrong: Incorrect because on-change is better for event-driven monitoring and bandwidth efficiency.
Quick Answer
The answer is that a single telemetry subscription can include both periodic and on-change sensors, making the first statement true. This is correct because periodic telemetry sends data at fixed intervals regardless of state, while on-change telemetry transmits data only when a monitored value actually changes, reducing bandwidth but potentially missing transient events if suppression is applied. On the ENCOR 350-401 exam, this topic tests your understanding of model-driven telemetry configuration and the trade-offs between consistency and efficiency. A common trap is assuming on-change is universally supported for all YANG paths, but it is not—always verify path support. Remember that periodic ensures regular updates at the cost of increased load, whereas on-change is efficient but can miss rapid fluctuations. A useful memory tip: “Periodic is predictable, on-change is efficient—combine them for the best of both worlds.”
CCNP 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.
Which three statements about telemetry data collection intervals and on-change notifications are true? (Choose three.)
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
Periodic telemetry sends data at a configured interval regardless of whether the value has changed.
Periodic telemetry sends data at fixed intervals, while on-change sends data only when a value changes. On-change reduces bandwidth but may miss transient events if suppression is used. Periodic ensures regular updates but increases load. Both can be combined in a single subscription. On-change is not always supported for all YANG paths.
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.
- ✓
Periodic telemetry sends data at a configured interval regardless of whether the value has changed.
Why this is correct
Correct because periodic subscriptions push data on a timer, ensuring consistent updates.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
On-change telemetry sends data only when the monitored value changes, reducing network overhead.
Why this is correct
Correct because on-change minimizes unnecessary data transmission.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
A single telemetry subscription can include both periodic and on-change sensors.
Why this is correct
Correct because Cisco IOS-XE and NX-OS allow mixing sensor paths with different update policies.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
On-change telemetry guarantees that every change, no matter how brief, will be reported.
Why it's wrong here
Incorrect because on-change may use suppression timers to avoid flooding, potentially missing very short-lived changes.
- ✗
Periodic telemetry is always preferred over on-change for all use cases.
Why it's wrong here
Incorrect because on-change is better for event-driven monitoring and bandwidth efficiency.
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.
- →
Model-Driven Telemetry — study guide chapter
Learn the concepts, then practise the questions
- →
Model-Driven Telemetry practice questions
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ENCOR 350-401 study guide
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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: Periodic telemetry sends data at a configured interval regardless of whether the value has changed. — Periodic telemetry sends data at fixed intervals, while on-change sends data only when a value changes. On-change reduces bandwidth but may miss transient events if suppression is used. Periodic ensures regular updates but increases load. Both can be combined in a single subscription. On-change is not always supported for all YANG paths.
What should I do if I get this 350-401 question wrong?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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Last reviewed: Jun 18, 2026
This 350-401 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 350-401 exam.
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