- A
Use a single-zone node pool with multiple replicas.
Why wrong: Single-zone node pools are vulnerable to zone failures and may become unavailable during upgrades in that zone.
- B
Use multiple node pools across different zones within the cluster.
Multi-zone node pools allow pods to be rescheduled in other zones during upgrades.
- C
Configure PodDisruptionBudgets to allow only a small number of pods to be unavailable during upgrades.
PDBs ensure that voluntary disruptions do not bring down too many pods at once.
- D
Enable cluster autoscaling to add nodes during upgrades.
Why wrong: Autoscaling adds nodes based on resource demand, not to maintain availability during upgrades.
- E
Enable regional clusters for multi-zone control plane.
Why wrong: Regional clusters provide high availability for the control plane, but node pools must also be multi-zone for workload availability.
Quick Answer
The answer is to configure PodDisruptionBudgets and deploy multiple node pools across different zones. PodDisruptionBudgets ensure high availability during GKE cluster upgrades by defining the minimum number of pods that must remain available, preventing the upgrade process from taking down too many replicas at once. Meanwhile, distributing node pools across zones protects against zone-level failures, so if one zone is drained for maintenance, the application continues serving from the others. On the Google Professional Cloud Architect exam, this pairing tests your understanding of voluntary disruption management versus infrastructure redundancy—a common trap is choosing only one of these or confusing PDBs with horizontal pod autoscaling. Remember the memory tip: "Pods stay, zones spread"—PDBs control pod survivability, while multi-zonal pools spread the failure risk.
Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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 company deploys a critical application on Google Kubernetes Engine (GKE) and wants to ensure high availability during cluster upgrades. Which TWO practices should they follow?
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
Use multiple node pools across different zones within the cluster.
Option B is correct because deploying multiple node pools across different zones ensures that if one zone fails or is taken down for maintenance, the application can continue serving from the other zones. This aligns with GKE's best practice for high availability by distributing workloads across failure domains. Option C is correct because PodDisruptionBudgets (PDBs) define the minimum number of pods that must remain available during voluntary disruptions like cluster upgrades, preventing the upgrade from taking down too many replicas at once.
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 a single-zone node pool with multiple replicas.
Why it's wrong here
Single-zone node pools are vulnerable to zone failures and may become unavailable during upgrades in that zone.
- ✓
Use multiple node pools across different zones within the cluster.
Why this is correct
Multi-zone node pools allow pods to be rescheduled in other zones during upgrades.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure PodDisruptionBudgets to allow only a small number of pods to be unavailable during upgrades.
Why this is correct
PDBs ensure that voluntary disruptions do not bring down too many pods at once.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable cluster autoscaling to add nodes during upgrades.
Why it's wrong here
Autoscaling adds nodes based on resource demand, not to maintain availability during upgrades.
- ✗
Enable regional clusters for multi-zone control plane.
Why it's wrong here
Regional clusters provide high availability for the control plane, but node pools must also be multi-zone for workload availability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse control plane high availability (regional clusters) with application-level high availability, or they assume autoscaling can compensate for disruption during upgrades, when in fact PDBs and multi-zone node pools are the correct mechanisms.
Detailed technical explanation
How to think about this question
During a GKE cluster upgrade, nodes are cordoned and drained one by one. A PodDisruptionBudget (PDB) with a maxUnavailable of 1 (or minAvailable of N-1) ensures the upgrade process respects application availability by blocking the drain of a node if it would violate the budget. For multi-zone resilience, GKE uses regional clusters where the control plane runs in three zones, but application pods must be scheduled across zones via node pools or topology spread constraints to survive a zone failure.
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCA question test?
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 within the cluster. — Option B is correct because deploying multiple node pools across different zones ensures that if one zone fails or is taken down for maintenance, the application can continue serving from the other zones. This aligns with GKE's best practice for high availability by distributing workloads across failure domains. Option C is correct because PodDisruptionBudgets (PDBs) define the minimum number of pods that must remain available during voluntary disruptions like cluster upgrades, preventing the upgrade from taking down too many replicas at once.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
This PCA practice question is part of Courseiva's free Google Cloud 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.
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