Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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.
An organization deploys a microservices application on Google Kubernetes Engine (GKE) with multiple Deployments. They want to ensure that the application remains available during a cluster-wide upgrade. Which three best practices should they follow? (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 multiple node pools across different zones.
Option C is correct because deploying node pools across multiple zones ensures that GKE can perform a cluster-wide upgrade by upgrading nodes in one zone at a time, maintaining application availability as long as the workload is replicated across zones. This leverages GKE's zonal upgrade strategy, which upgrades nodes in a single zone before moving to the next, preventing simultaneous disruption of all replicas.
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.
✗
Enable cluster autoscaling.
Why it's wrong here
Autoscaling helps with capacity but not with availability during upgrades.
✗
Use StatefulSets instead of Deployments for all services.
Why it's wrong here
StatefulSets are for stateful apps; not needed for all services.
✓
Use multiple node pools across different zones.
Why this is correct
Spreading node pools across zones allows rolling upgrades zone by zone.
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 node pools with multiple node types.
Why it's wrong here
Different node types do not directly improve availability during upgrades.
✓
Set up a load balancer with health checks.
Why this is correct
Health checks ensure traffic is only sent to ready pods.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure PodDisruptionBudgets for each deployment.
Why this is correct
PodsDisruptionBudgets ensure a minimum number of pods are always running.
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
The trap here is that candidates often confuse cluster autoscaling or multi-node types with high availability during upgrades, but GKE's upgrade process is zone-aware, not node-type-aware, and autoscaling only handles scaling, not disruption management.
Detailed technical explanation
How to think about this question
GKE cluster upgrades use a rolling update strategy where nodes are drained and recreated one by one within a node pool; when node pools span multiple zones, the upgrade proceeds zone by zone, minimizing the blast radius. PodDisruptionBudgets (PDBs) enforce a minimum number of available pods during voluntary disruptions like upgrades, and when combined with multi-zonal node pools, they ensure that the remaining replicas in other zones can serve traffic while one zone is being upgraded. In practice, setting a PDB with maxUnavailable: 1 and deploying at least 3 replicas across 3 zones guarantees zero downtime during a zonal upgrade.
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.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use multiple node pools across different zones. — Option C is correct because deploying node pools across multiple zones ensures that GKE can perform a cluster-wide upgrade by upgrading nodes in one zone at a time, maintaining application availability as long as the workload is replicated across zones. This leverages GKE's zonal upgrade strategy, which upgrades nodes in a single zone before moving to the next, preventing simultaneous disruption of all replicas.
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.
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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