- A
Store service account keys in Kubernetes secrets and mount them into each pod
Why wrong: Managing keys in secrets is less secure and not recommended for production; Workload Identity is the preferred approach.
- B
Use a CSI driver to mount IAM credentials into pods
Why wrong: CSI drivers are for storage volumes, not for IAM credentials.
- C
Use Workload Identity to bind a Kubernetes service account to a GCP service account
Workload Identity enables per-pod IAM permissions by mapping Kubernetes service accounts to GCP service accounts.
- D
Assign a service account to each node pool and configure pod security policies
Why wrong: Node-level service account grants permissions to all pods on the node, not fine-grained per pod.
Question 906 of 1,000
Google PCA Practice Question: Designing and Planning a Cloud Solution Architecture
This PCA practice question tests your understanding of designing and planning a cloud solution architecture. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is building a microservices architecture on Google Kubernetes Engine (GKE) and needs to ensure each microservice can only access specific Cloud Storage buckets. IAM permissions should be assigned at the pod level, not at the node level. What is the recommended approach?
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 Workload Identity to bind a Kubernetes service account to a GCP service account
Workload Identity is the recommended approach because it allows you to bind a Kubernetes service account (KSA) to a Google Cloud service account (GSA), enabling pods to authenticate to Google Cloud APIs without managing or storing service account keys. This satisfies the requirement for pod-level IAM permissions, as each pod can inherit the GSA's roles (e.g., roles/storage.objectViewer) for specific Cloud Storage buckets, while avoiding node-level assignment.
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.
- ✗
Store service account keys in Kubernetes secrets and mount them into each pod
Why it's wrong here
Managing keys in secrets is less secure and not recommended for production; Workload Identity is the preferred approach.
- ✗
Use a CSI driver to mount IAM credentials into pods
Why it's wrong here
CSI drivers are for storage volumes, not for IAM credentials.
- ✓
Use Workload Identity to bind a Kubernetes service account to a GCP service account
Why this is correct
Workload Identity enables per-pod IAM permissions by mapping Kubernetes service accounts to GCP service accounts.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Assign a service account to each node pool and configure pod security policies
Why it's wrong here
Node-level service account grants permissions to all pods on the node, not fine-grained per pod.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common misconception tested on the Google PCA exam is that storing service account keys in Kubernetes secrets (Option A) is acceptable for production. However, the trap here is that Workload Identity eliminates the need for static keys entirely, aligning with Google's security best practices and the requirement for pod-level identity.
Detailed technical explanation
How to think about this question
Workload Identity works by configuring a trust relationship between a KSA and a GSA, then using the GKE Metadata Server to inject a short-lived OAuth2 access token or identity token into the pod's metadata endpoint. Under the hood, the pod's Kubernetes service account token (a JWT) is exchanged for a GCP access token via the federation endpoint (https://sts.googleapis.com), enabling fine-grained IAM without managing keys. In a real-world scenario, this allows a microservice handling user uploads to have read-write access to a specific bucket while another microservice has read-only access, all enforced by IAM conditions.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Designing and Planning a Cloud Solution Architecture — study guide chapter
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FAQ
Questions learners often ask
What does this PCA question test?
Designing and Planning a Cloud Solution Architecture — This question tests Designing and Planning a Cloud Solution Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Workload Identity to bind a Kubernetes service account to a GCP service account — Workload Identity is the recommended approach because it allows you to bind a Kubernetes service account (KSA) to a Google Cloud service account (GSA), enabling pods to authenticate to Google Cloud APIs without managing or storing service account keys. This satisfies the requirement for pod-level IAM permissions, as each pod can inherit the GSA's roles (e.g., roles/storage.objectViewer) for specific Cloud Storage buckets, while avoiding node-level assignment.
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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Last reviewed: Jul 4, 2026
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