Google PCA Designing for Security and Compliance Practice Question
This PCA practice question tests your understanding of designing for security and compliance. 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 wants to allow a Kubernetes pod in GKE to access a Cloud Storage bucket using a specific service account without storing long-lived credentials. Which method should be used?
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 the Kubernetes service account to a Google Cloud service account
Workload Identity allows a Kubernetes service account to act as a Google Cloud service account by binding them. This eliminates the need for static keys and uses short-lived tokens.
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.
✗
Assign the service account directly to the GKE node pool
Why it's wrong here
Assigning to node pool gives the same identity to all pods, not fine-grained.
✗
Create a JSON key for a service account and mount it as a secret in the pod
Why it's wrong here
Using JSON keys is insecure and long-lived; Workload Identity is the recommended approach.
✓
Use Workload Identity to bind the Kubernetes service account to a Google Cloud service account
Why this is correct
Workload Identity provides secure, automated authentication without static keys.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Application Default Credentials on the pod
Why it's wrong here
ADC on GKE uses the node's service account, which may not be the intended one.
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: Use Workload Identity to bind the Kubernetes service account to a Google Cloud service account — Workload Identity allows a Kubernetes service account to act as a Google Cloud service account by binding them. This eliminates the need for static keys and uses short-lived tokens.
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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Question Discussion
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