Google PCA Designing for Security and Compliance Practice Question
This PCA practice question tests your understanding of designing for security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 wants to allow a Kubernetes pod in GKE to access a Cloud Storage bucket using the pod's own identity, without managing long-lived credentials. They have created a Google service account (GSA) and a Kubernetes service account (KSA). What should they do to bind the KSA to the GSA?
Create a service account key and mount it as a secret in the pod
Why wrong: This would use long-lived keys, which Workload Identity is designed to avoid.
B
Add an annotation to the KSA referencing the GSA, and grant the KSA the iam.workloadIdentityUser role on the GSA
This is the correct configuration for Workload Identity: annotate the KSA with the GSA email, and grant the KSA the workload identity user role on the GSA.
C
Grant the GSA the roles/iam.serviceAccountUser role on the project
Why wrong: This would allow the GSA to be used by users, not bind a KSA to a GSA.
D
Add an annotation to the GSA referencing the KSA, and grant the KSA the iam.workloadIdentityUser role on the GSA
Why wrong: The annotation is on the KSA, not the GSA.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add an annotation to the KSA referencing the GSA, and grant the KSA the iam.workloadIdentityUser role on the GSA
Workload Identity allows you to configure a KSA to act as a GSA by adding an annotation to the KSA and granting the GSA the necessary IAM role. The GSA does not impersonate the KSA; the KSA impersonates the GSA. The annotation is set on the KSA, not the pod. The GSA does not need to be bound to the KSA via an IAM role on the KSA.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create a service account key and mount it as a secret in the pod
Why it's wrong here
This would use long-lived keys, which Workload Identity is designed to avoid.
✓
Add an annotation to the KSA referencing the GSA, and grant the KSA the iam.workloadIdentityUser role on the GSA
Why this is correct
This is the correct configuration for Workload Identity: annotate the KSA with the GSA email, and grant the KSA the workload identity user role on the GSA.
Related concept
Static NAT maps one inside address to one outside address.
✗
Grant the GSA the roles/iam.serviceAccountUser role on the project
Why it's wrong here
This would allow the GSA to be used by users, not bind a KSA to a GSA.
✗
Add an annotation to the GSA referencing the KSA, and grant the KSA the iam.workloadIdentityUser role on the GSA
Why it's wrong here
The annotation is on the KSA, not the GSA.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
Designing for Security and Compliance — This question tests Designing for Security and Compliance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Add an annotation to the KSA referencing the GSA, and grant the KSA the iam.workloadIdentityUser role on the GSA — Workload Identity allows you to configure a KSA to act as a GSA by adding an annotation to the KSA and granting the GSA the necessary IAM role. The GSA does not impersonate the KSA; the KSA impersonates the GSA. The annotation is set on the KSA, not the pod. The GSA does not need to be bound to the KSA via an IAM role on the KSA.
What should I do if I get this PCA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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