- A
Mount a service account JSON key file as a Kubernetes Secret and set GOOGLE_APPLICATION_CREDENTIALS
Why wrong: This works but requires managing key files — rotation, secure storage, and risk of key leakage. It's the pattern Workload Identity is designed to replace.
- B
Enable Workload Identity on the GKE cluster and bind a Kubernetes ServiceAccount to a GCP IAM ServiceAccount
Workload Identity allows Pods to authenticate to GCP APIs through the GKE metadata server, completely eliminating the need for service account key files.
- C
Rely on the GKE node's Compute Engine service account for all Pod authentication
Why wrong: Using the node's service account grants all Pods on the node identical GCP permissions — this violates the principle of least privilege.
- D
Grant the GKE node pool's service account the Storage Admin role to cover all Pod needs
Why wrong: Granting broad roles to the node service account over-provisions permissions for all Pods on those nodes, violating least privilege.
Quick Answer
The answer is to enable Workload Identity on the GKE cluster and bind a Kubernetes ServiceAccount to a GCP IAM ServiceAccount. This is the correct approach because Workload Identity allows Pods to authenticate to Google Cloud APIs by exchanging their Kubernetes identity for a short-lived IAM token via the GKE metadata server, completely eliminating the need to create, store, or rotate any service account key files. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of secure authentication patterns—the common trap is choosing to generate a key and mount it as a secret, which violates the requirement to avoid managing keys. Remember the core principle: Workload Identity replaces static keys with dynamic identity federation. A useful memory tip is "Bind, don't store"—bind the Kubernetes ServiceAccount to the IAM ServiceAccount, and you never have to store a key.
Google ACE Configuring access and security Practice Question
This ACE practice question tests your understanding of configuring access and security. 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 GKE Pod needs to call the Cloud Storage API. The team wants to avoid creating and managing service account key files. 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
Enable Workload Identity on the GKE cluster and bind a Kubernetes ServiceAccount to a GCP IAM ServiceAccount
Workload Identity is the recommended approach because it allows a Kubernetes ServiceAccount in GKE to authenticate as a GCP IAM ServiceAccount without managing or storing any service account key files. This eliminates the security risk of key leakage and simplifies credential rotation. By binding the Kubernetes ServiceAccount to a GCP IAM ServiceAccount, Pods can directly call Cloud Storage APIs using the IAM permissions of the linked service account, with automatic token exchange via the GKE metadata server.
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.
- ✗
Mount a service account JSON key file as a Kubernetes Secret and set GOOGLE_APPLICATION_CREDENTIALS
Why it's wrong here
This works but requires managing key files — rotation, secure storage, and risk of key leakage. It's the pattern Workload Identity is designed to replace.
- ✓
Enable Workload Identity on the GKE cluster and bind a Kubernetes ServiceAccount to a GCP IAM ServiceAccount
Why this is correct
Workload Identity allows Pods to authenticate to GCP APIs through the GKE metadata server, completely eliminating the need for service account key files.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Rely on the GKE node's Compute Engine service account for all Pod authentication
Why it's wrong here
Using the node's service account grants all Pods on the node identical GCP permissions — this violates the principle of least privilege.
- ✗
Grant the GKE node pool's service account the Storage Admin role to cover all Pod needs
Why it's wrong here
Granting broad roles to the node service account over-provisions permissions for all Pods on those nodes, violating least privilege.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that the node's Compute Engine service account is sufficient for Pod-level authentication, but the trap here is that this approach lacks Pod-level identity isolation and violates least privilege, whereas Workload Identity provides a secure, keyless, and granular solution.
Detailed technical explanation
How to think about this question
Workload Identity works by configuring the GKE cluster with a metadata server that intercepts token requests from Pods. When a Pod uses a Kubernetes ServiceAccount annotated with `iam.gke.io/gcp-service-account`, the metadata server exchanges the Kubernetes token for a GCP IAM access token via the GKE System Identity, which is a Google-managed service account. This token is then used to authenticate to Cloud Storage APIs, and the IAM binding is done through a GCP IAM policy binding between the Kubernetes ServiceAccount (as a principal) and the GCP IAM ServiceAccount, enabling fine-grained, keyless authentication.
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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Configuring access and security — study guide chapter
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FAQ
Questions learners often ask
What does this ACE question test?
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Workload Identity on the GKE cluster and bind a Kubernetes ServiceAccount to a GCP IAM ServiceAccount — Workload Identity is the recommended approach because it allows a Kubernetes ServiceAccount in GKE to authenticate as a GCP IAM ServiceAccount without managing or storing any service account key files. This eliminates the security risk of key leakage and simplifies credential rotation. By binding the Kubernetes ServiceAccount to a GCP IAM ServiceAccount, Pods can directly call Cloud Storage APIs using the IAM permissions of the linked service account, with automatic token exchange via the GKE metadata server.
What should I do if I get this ACE 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: Jun 30, 2026
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