mediumMultiple Choice
CCNP 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 for periodic subscriptions; periodic telemetry requires a positive interval and always transmits on that timer regardless of counter changes. On-change subscriptions, not periodic ones, deliver event-driven updates. Periodic suits steady polling where every sample must reach the collector.
- ✓
Configure an on-change subscription
Why this is correct
An on-change subscription publishes telemetry only when the monitored interface counters actually change, satisfying the requirement to avoid fixed-interval updates. A periodic subscription would instead stream at a configured interval regardless of whether values changed.
- ✗
Set the suppress-repetition flag in a periodic subscription
Why it's wrong here
Suppress-repetition applies to periodic subscriptions, where the router still samples at the fixed interval and merely drops unchanged updates; the stream remains interval-driven, not change-driven. It is tempting because it reduces redundant transmissions, which suits bandwidth-constrained periodic telemetry where only altered values matter.
- ✗
Use a dynamic subscription with a sample-interval of 1 second
Why it's wrong here
A dynamic subscription with a one-second sample-interval still polls on a timer; it changes how often data is collected, not what triggers transmission. Change-triggered streaming requires an on-change subscription. Dynamic subscriptions suit scenarios needing frequent fixed-cadence updates of fast-moving counters.
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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.