Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 startup deploys a microservices application on GKE. They need to ensure high availability of the services. Which two strategies should they implement? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use regional persistent disks for stateful components
Option B is correct because regional persistent disks provide synchronous replication across two zones within a region, ensuring that stateful workloads (e.g., databases) remain available even if an entire zone fails. This is critical for high availability of stateful components in a GKE cluster, as it prevents data loss and allows pods to be rescheduled in another zone with the same persistent volume.
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 horizontal pod autoscaling
Why it's wrong here
HPA adjusts the number of pods for performance, not availability.
✓
Use regional persistent disks for stateful components
Why this is correct
Regional PDs replicate data synchronously across zones.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use node auto-repair
Why it's wrong here
Node auto-repair restores node health but does not guarantee application availability.
✓
Deploy the application across multiple zones in a region
Why this is correct
Multi-zone deployment ensures service continuity if a zone fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use cluster autoscaler
Why it's wrong here
Cluster autoscaler adjusts node count, not application HA.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse auto-scaling mechanisms (HPA, cluster autoscaler) with high availability, failing to recognize that true HA requires redundancy across failure domains (zones) and persistent storage that survives zone outages.
Detailed technical explanation
How to think about this question
Regional persistent disks use synchronous replication at the block level across two zones, ensuring a Recovery Point Objective (RPO) of zero and a Recovery Time Objective (RTO) of minutes. When a pod using a regional PD fails in one zone, GKE can reschedule it in the other zone using the same disk, but the pod must be configured with pod anti-affinity and a multi-zone deployment (Option D) to leverage this. In practice, combining regional PDs with a multi-zone deployment and a StatefulSet with pod anti-affinity is the standard pattern for HA stateful workloads on GKE.
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.
TExam Day Tips
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use regional persistent disks for stateful components — Option B is correct because regional persistent disks provide synchronous replication across two zones within a region, ensuring that stateful workloads (e.g., databases) remain available even if an entire zone fails. This is critical for high availability of stateful components in a GKE cluster, as it prevents data loss and allows pods to be rescheduled in another zone with the same persistent volume.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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