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 developer needs to securely store a database password that will be used by a Compute Engine instance. The password must be rotated automatically every 30 days. Which service should they use?
Cloud KMS
Why wrong: Cloud KMS manages encryption keys, not application secrets like database passwords.
Cloud Storage with encryption
Why wrong: Cloud Storage can store encrypted files but does not have built-in rotation capabilities.
Environment variables
Why wrong: Environment variables are not secure and cannot be automatically rotated.
Secret Manager
Secret Manager stores secrets and supports automatic rotation every 30 days.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Secret Manager
Secret Manager is designed for storing secrets like API keys and passwords, and it supports automatic rotation schedules. Cloud KMS is for encryption keys, not generic secrets. Cloud Storage can store encrypted data but does not natively support rotation. Environment variables are insecure and not managed.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Cloud KMS
Why it's wrong here
Cloud KMS manages encryption keys, not application secrets like database passwords.
Cloud Storage with encryption
Why it's wrong here
Cloud Storage can store encrypted files but does not have built-in rotation capabilities.
Environment variables
Why it's wrong here
Environment variables are not secure and cannot be automatically rotated.
Secret Manager
Why this is correct
Secret Manager stores secrets and supports automatic rotation every 30 days.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
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
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.
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
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
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.
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FAQ
Designing for Security and Compliance — This question tests Designing for Security and Compliance — Static NAT maps one inside address to one outside address..
The correct answer is: Secret Manager — Secret Manager is designed for storing secrets like API keys and passwords, and it supports automatic rotation schedules. Cloud KMS is for encryption keys, not generic secrets. Cloud Storage can store encrypted data but does not natively support rotation. Environment variables are insecure and not managed.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jul 4, 2026
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