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.
A company runs a stateful application on GKE using StatefulSets. Which THREE practices improve reliability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use headless services.
A headless service (clusterIP: None) allows direct pod-to-pod communication without load balancing, which is essential for stateful applications like databases that require stable network identities. Each pod in a StatefulSet gets a unique DNS name (e.g., pod-0.service.namespace.svc.cluster.local), enabling reliable discovery and ordering for replication, leader election, and failover. This ensures that clients always reach the correct pod instance, improving overall reliability.
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 headless services.
Why this is correct
Provides stable network identities for stateful workloads.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use horizontal autoscaling based on disk usage.
Why it's wrong here
Not a standard practice; scaling stateful workloads is complex.
✓
Use volume snapshots for backup.
Why this is correct
Enables data recovery and migration.
Related concept
Read the scenario before looking for a memorised answer.
✓
Use pod disruption budgets.
Why this is correct
Limits the number of pods that can be disrupted simultaneously.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use persistent volumes with reclaim policy Delete.
Why it's wrong here
Deletes volumes on pod deletion, risking data loss.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that horizontal autoscaling can be based on any arbitrary metric like disk usage, but the HPA only supports CPU, memory, and custom/external metrics that must be exposed through the Metrics Server or a custom metrics adapter.
Detailed technical explanation
How to think about this question
Headless services rely on DNS A/AAAA record lookups that return the pod IPs directly, bypassing kube-proxy and iptables rules. This is critical for stateful applications like Cassandra or ZooKeeper, where each node must discover all peers by name for gossip protocols and quorum formation. Additionally, StatefulSets guarantee ordinal pod naming (e.g., web-0, web-1) and stable storage via PersistentVolumeClaims, ensuring that even after a pod is recreated, it reattaches to the same volume and retains its identity.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 headless services. — A headless service (clusterIP: None) allows direct pod-to-pod communication without load balancing, which is essential for stateful applications like databases that require stable network identities. Each pod in a StatefulSet gets a unique DNS name (e.g., pod-0.service.namespace.svc.cluster.local), enabling reliable discovery and ordering for replication, leader election, and failover. This ensures that clients always reach the correct pod instance, improving overall reliability.
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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