The answer is pod anti-affinity configured across multiple zones. This is the correct choice because it ensures that replicas of the same application are scheduled on different nodes in different zones, preventing a single zonal failure from taking down all instances and directly supporting GKE high availability best practices. On the Google Professional Cloud Architect exam, this concept tests your understanding of failure domain isolation within a regional cluster; a common trap is confusing node-level anti-affinity with zonal anti-affinity, or assuming managed instance groups alone guarantee pod distribution. Remember that while managed instance groups with autohealing restore node health, they do not control pod placement—only pod anti-affinity rules enforce the cross-zone scheduling required for true resilience. A useful memory tip: think “pods apart, zones apart” to recall that anti-affinity spreads replicas across failure domains, not just across nodes.
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.
Which TWO options are best practices for ensuring high availability of an application running on Google Kubernetes Engine (GKE)?
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 pod anti-affinity to spread pods across multiple zones.
Option A is correct because pod anti-affinity ensures that pods from the same application are scheduled on different nodes across multiple zones, reducing the blast radius of a zonal failure. This is a key pattern for achieving high availability in GKE, as it prevents a single zone outage from taking down all replicas of your application.
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 pod anti-affinity to spread pods across multiple zones.
Why this is correct
Spreading pods across zones improves resilience to zonal failures.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy all nodes in the same zone to simplify networking.
Why it's wrong here
Single zone is a single point of failure.
✓
Configure managed instance groups with autohealing.
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Prefer using preemptible VMs for cost savings.
Why it's wrong here
Preemptible VMs can be terminated at any time, reducing availability.
✗
Use a single zonal cluster to avoid cross-zone latency.
Why it's wrong here
A single zone is a single point of failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse cost-optimization strategies (like preemptible VMs) with high-availability strategies, or they mistakenly believe that a single-zone cluster with autohealing is sufficient for zonal fault tolerance, when in fact you need multi-zone distribution and a regional cluster.
Detailed technical explanation
How to think about this question
Pod anti-affinity uses the 'requiredDuringSchedulingIgnoredDuringExecution' or 'preferredDuringSchedulingIgnoredDuringExecution' topology constraints with a topology key of 'topology.kubernetes.io/zone' to enforce distribution across zones. Under the hood, GKE's cluster autoscaler and node auto-provisioning work with managed instance groups (MIGs) per zone; configuring MIGs with autohealing (Option C) ensures that if a node fails health checks, it is automatically recreated, maintaining the desired node count and thus the capacity for your pods to reschedule.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 pod anti-affinity to spread pods across multiple zones. — Option A is correct because pod anti-affinity ensures that pods from the same application are scheduled on different nodes across multiple zones, reducing the blast radius of a zonal failure. This is a key pattern for achieving high availability in GKE, as it prevents a single zone outage from taking down all replicas of your application.
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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