PeopleCert DevOps-SRE - PeopleCert DevOps Site Reliability Engineer (SRE) Certification Exam
Question #6 (Topic: Demo Questions)
When applied to service levels, the principle of decreasing marginal productivity can be represented in three stages. Which of the following is NOT one of these stages?
Correct Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Comprehensive and Detailed Explanation From Exact Extract:
SRE applies economic principles, including diminishing marginal returns, to reliability engineering. As per the SRE Book: “Improving reliability becomes more expensive as the target approaches 100%, moving from increasing returns, to diminishing returns, and eventually negative returns.” (SRE Book – SLO Economics). This framework helps explain why striving for 100% availability is impractical and cost-ineffective.
The three recognized stages are:
Increasing returns – early improvements are inexpensive and highly impactful
Diminishing returns – costs rise while benefits shrink
Negative returns – achieving additional “nines” may reduce value due to slowed innovation
“Possible returns” is not part of this model.
Thus, D is the correct answer.
[References:, Site Reliability Engineering, Chapter: “Service Level Objectives.”, ]
Question #7 (Topic: Demo Questions)
Which of the following BEST illustrates the engineering approach for work done within SRE?
Correct Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Comprehensive and Detailed Explanation From Exact Extract:
Google defines SRE as “what happens when you ask a software engineer to design an operations function.” (SRE Book – Introduction). The core engineering approach in SRE focuses on:
Eliminating toil
Building scalable systems
Applying software engineering to operational challenges
Learning from previous solutions and patterns
The SRE Book emphasizes: “SREs focus on designing and engineering solutions that reduce manual operations and scale service delivery.” (Chapter: Eliminating Toil). This aligns directly with Option B: designing a solution to eliminate toil and scale service delivery, informed by prior successful engineering patterns.
Option A focuses only on automating a single tuning activity—not holistic engineering.
Option C describes deployment, not engineering approach to operations.
Option D is about incident response, not engineering strategy.
Thus, B is the best representation of SRE’s engineering approach.
[References:, Site Reliability Engineering, Chapters: “What Is SRE?”, “Eliminating Toil.”, The Site Reliability Workbook, Engineering scalable solutions., ]
Question #8 (Topic: Demo Questions)
If an organization wants to promote changes automatically and reduce dependency errors, what steps should they take?
Correct Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Comprehensive and Detailed Explanation From Exact Extract:
Using verified and signed artifacts is essential for safe automation, ensuring that deployments are consistent and free of dependency or supply chain errors. This is a fundamental principle in Google’s release engineering and SRE practices.
The Site Reliability Engineering Book, chapter “Release Engineering,” states:
“Releases should be built once, tested, signed, and stored in a secure repository. Only signed and verified artifacts should be promoted to production to prevent configuration drift and dependency inconsistencies.”
The SRE Workbook echoes this:
“Automated promotions depend on the integrity and immutability of artifacts. Signed artifacts ensure consistency and prevent errors related to mismatched dependencies.”
Why the other options are incorrect:
A External visibility is irrelevant and may create security risks.
C Error budgets relate to reliability, not artifact promotion.
D SLOs do not define artifact signing; this is handled by release engineering processes.
Thus, the correct answer is B.
[References:, Site Reliability Engineering Book, “Release Engineering”, SRE Workbook, “Automation and Safe Releases”, , ]
Question #9 (Topic: Demo Questions)
Which of the following is the BEST example or an SRE team that embraces full-service ownership?
Correct Answer: D
Explanation not available for this question.
Question #10 (Topic: Demo Questions)
Which of the following BEST describes how to contribute to achieving higher levels of availability?
1. Measuring the critical aspects
2. Maintaining a close relationship with development teams
3. Measuring staff performance
4. Maintaining a close interval between detection and correction
Correct Answer: D
Explanation not available for this question.