200-901 Infrastructure and Automation Practice Question
This 200-901 practice question tests your understanding of infrastructure and automation. 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.
Exhibit
Refer to the exhibit.
telemetry ietf subscription 101
encoding encode-kvgpb
filter xpath /interfaces/interface[name='GigabitEthernet1']/oper-status
source-address 10.1.1.1
stream yang-push
update-policy periodic 500
Based on the exhibit, what is the frequency of the telemetry subscription?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Every 500 milliseconds
The exhibit shows a telemetry subscription with a 'period' of 500, which in Cisco model-driven telemetry (MDT) is expressed in milliseconds. Therefore, the frequency is every 500 milliseconds, making option B correct.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Every 500 seconds
Why it's wrong here
Periodic policy uses milliseconds, not seconds.
✓
Every 500 milliseconds
Why this is correct
The periodic policy value is in milliseconds; 500 ms is the correct interpretation.
Related concept
Read the scenario before looking for a memorised answer.
✗
When the management connection is re-established
Why it's wrong here
No such behavior is indicated.
✗
On-change only
Why it's wrong here
The policy is 'periodic' not 'on-change'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the unit of the 'period' value, and the trap here is that candidates assume the value is in seconds (like many other network timers) instead of milliseconds, leading them to choose 'Every 500 seconds'.
Detailed technical explanation
How to think about this question
In Cisco IOS XE and NX-OS model-driven telemetry, the 'period' field in a subscription defines the cadence for periodic push updates, and it is always configured in milliseconds (e.g., 500 ms = 0.5 seconds). This is part of the YANG data model for telemetry subscriptions (RFC 8343 and Cisco-specific models). A real-world scenario where 500 ms matters is monitoring interface counters or CPU utilization in high-frequency trading networks, where sub-second granularity is critical for detecting anomalies.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Every 500 milliseconds — The exhibit shows a telemetry subscription with a 'period' of 500, which in Cisco model-driven telemetry (MDT) is expressed in milliseconds. Therefore, the frequency is every 500 milliseconds, making option B correct.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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