PCA Prometheus Fundamentals Practice Question
What is the difference between a Histogram and a Summary?
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
✓
Histograms use buckets for quantile estimation
Histograms provide aggregated quantiles on the server side via buckets, while Summaries calculate quantiles on the client side.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Histograms use buckets for quantile estimation
Why this is correct
Histograms aggregate counts into predefined buckets.
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Histograms are computed on the client
Why it's wrong here
Summaries are computed on the client.
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Summaries are computed on the server
Why it's wrong here
Histograms use server-side aggregation.
- ✗
Summaries cannot be aggregated
Why it's wrong here
Summaries can be aggregated, but with lower accuracy.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CNCF / Linux Foundation exam blueprint
This PCA practice question is part of Courseiva's free CNCF / Linux Foundation 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 PCA exam.