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350-401 Practice Question: Is configuring model-driven telemetry on a Cisco…
A network engineer is configuring model-driven telemetry on a Cisco IOS-XE router to stream interface statistics to a collector using gRPC. The engineer wants to ensure that the telemetry data is sent only when there is a change in the interface counters, rather than at a fixed interval. Which configuration parameter should the engineer use to achieve this behavior?
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
✓
Configure an on-change subscription
'on-change' subscription because it triggers updates only when the monitored data changes, unlike periodic subscriptions that send data at fixed intervals. The other options are incorrect because 'periodic' sends data at a fixed interval, 'suppress-repetition' reduces duplicate updates in periodic subscriptions but does not enable on-change behavior, and 'sample-interval' is used for periodic subscriptions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a periodic subscription with a sample-interval of 0
Why it's wrong here
A sample-interval of 0 is invalid; periodic subscriptions require a positive integer for the interval.
- ✓
Configure an on-change subscription
Why this is correct
An on-change subscription sends updates only when the monitored data changes, which matches the requirement.
- ✗
Set the suppress-repetition flag in a periodic subscription
Why it's wrong here
The suppress-repetition flag reduces duplicate updates but still sends data at the periodic interval, not only on change.
- ✗
Use a dynamic subscription with a sample-interval of 1 second
Why it's wrong here
A dynamic subscription with a sample-interval sends data periodically, not only on change.
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Same concept, more angles
1 more way this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Examine the following telemetry configuration on a Cisco IOS-XE device: telemetry ietf subscription 200 encoding encode-kvgpb filter xpath /interfaces/interface[name='GigabitEthernet0/0/0']/state stream yang-push update-policy on-change receiver ip address 192.168.1.100 50001 protocol grpc Which statement is true about this configuration?
medium- ✓ A.Data is pushed only when a change occurs in the state of GigabitEthernet0/0/0.
- B.Data is pushed every 200 seconds to the collector.
- C.The subscription uses JSON encoding.
- D.The filter selects all interfaces, not just GigabitEthernet0/0/0.
Why A: This subscription uses on-change update policy, so data is pushed only when a change occurs in the specified subtree.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.