The answer is to use managed instance groups with autoscaling, regional persistent disks, and health checks with load balancing. These three practices form the foundation of Compute Engine high availability best practices because they address the three critical failure modes: instance failure, zone failure, and traffic misrouting. Managed instance groups provide autoscaling and autohealing to replace unhealthy VMs automatically, regional persistent disks replicate data synchronously across two zones for durable storage, and health checks with load balancing ensure traffic is only sent to healthy instances. On the Google Professional Data Engineer exam, this question tests your understanding of operational resilience patterns rather than just theoretical concepts; a common trap is selecting snapshot-based backups instead of regional persistent disks, which offer lower RTO. Remember the mnemonic "MIG, RPD, LB" — if you see any answer missing one of these three pillars, it is likely a distractor.
PDE Ensuring solution quality Practice Question
This PDE practice question tests your understanding of ensuring solution quality. 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.
A team runs a production application on Compute Engine. They want to ensure high availability and quality. Which three best practices should they implement? (Choose three.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use health checks and load balancing.
Use managed instance groups for autoscaling and autohealing, regional persistent disks for durable high-availability storage, and health checks with load balancing to distribute traffic to healthy instances.
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.
✓
Use health checks and load balancing.
Why this is correct
Health checks ensure only healthy instances receive traffic; load balancing provides fault tolerance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Cloud SQL read replicas for database load.
Why it's wrong here
Read replicas improve read throughput but are not a general high-availability practice for all applications.
✗
Enable OS Login for SSH access.
Why it's wrong here
OS Login improves security but does not directly impact application availability or quality.
✓
Use regional persistent disks for stateful data.
Why this is correct
Regional PDs replicate data across zones, protecting against zone failure.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use managed instance groups (MIGs) with autoscaling.
Why this is correct
MIGs automatically create and heal instances, ensuring capacity and availability.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which PDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Ensuring solution quality — This question tests Ensuring solution quality — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use health checks and load balancing. — Use managed instance groups for autoscaling and autohealing, regional persistent disks for durable high-availability storage, and health checks with load balancing to distribute traffic to healthy instances.
What should I do if I get this PDE question wrong?
Identify which PDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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