PCA Promql Practice Question
If you perform 'A / B' where A and B have different sets of labels, what happens?
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
✓
It returns an empty result.
Binary operations require matching labels unless modifiers are used; otherwise, the result is empty.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It automatically ignores the extra labels.
Why it's wrong here
PromQL is strict about label matching.
- ✓
It returns an empty result.
Why this is correct
Without group or matching modifiers, no series will match.
- ✗
It returns the result of the division for all series.
Why it's wrong here
Only matching series are returned.
- ✗
It returns an error in the UI.
Why it's wrong here
It returns a valid but empty vector.
About these practice questions
This PCA question is part of Courseiva's 304-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
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.