KCNA Cloud Native Observability Practice Question
An SRE team defines an SLO that 99.9% of requests to a service should complete in under 500ms over a 30-day rolling window. If the service receives 10 million requests in a month, what is the maximum number of requests that can exceed the latency threshold while still meeting the SLO?
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
✓
10,000
SLO of 99.9% means up to 0.1% errors are allowed. 0.1% of 10,000,000 is 10,000 requests.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
10,000
Why this is correct
0.1% of 10 million is 10,000.
- ✗
5,000
Why it's wrong here
5,000 is 0.05%.
- ✗
1,000
Why it's wrong here
1,000 is 0.01% of 10 million, too strict.
- ✗
100,000
Why it's wrong here
100,000 is 1%, which would allow 99% SLO, not 99.9%.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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