The answer is Cloud Key Management Service (Cloud KMS), which provides centralized encryption key management for Google Cloud services. Cloud KMS is the correct choice because it acts as a single control plane for creating, rotating, and destroying customer-managed encryption keys (CMEK), enabling you to enforce encryption at rest across services like Cloud Storage and BigQuery while also managing keys used for TLS or application-level encryption in transit. On the Google Professional Cloud Architect exam, this question tests your understanding of how centralized key management differs from Google-managed default encryption—a common trap is confusing Cloud KMS with Cloud HSM, which is a hardware-backed option within KMS, not a separate service. Remember that Cloud KMS is the umbrella service for key lifecycle control; a simple memory tip is “KMS = Key Management Service, the master key vault for all your Google Cloud encryption needs.”
Google PCA Design for security and compliance Practice Question
This PCA practice question tests your understanding of design 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 is migrating sensitive customer data to Google Cloud. They need to ensure data is encrypted at rest and in transit. Which Google Cloud service provides a centralized way to manage encryption keys used by Google Cloud services?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud Key Management Service (Cloud KMS)
Cloud KMS is the correct choice because it provides a centralized, managed service for creating, rotating, and destroying encryption keys used by Google Cloud services. It integrates directly with services like Cloud Storage, BigQuery, and Compute Engine to enforce encryption at rest, and it supports customer-managed encryption keys (CMEK) for granular control. For data in transit, Cloud KMS can be used to manage keys for TLS or application-level encryption, though Google Cloud automatically encrypts all network traffic by default.
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.
✗
Cloud HSM
Why it's wrong here
Cloud HSM is a hardware security module service for managing encryption keys, but Cloud KMS is the more general key management service.
✗
Cloud External Key Manager (Cloud EKM)
Why it's wrong here
Cloud EKM allows you to use keys managed outside Google Cloud, but it's not the centralized service for GCP-managed keys.
✓
Cloud Key Management Service (Cloud KMS)
Why this is correct
Cloud KMS provides centralized management of encryption keys used by Google Cloud services.
Related concept
Read the scenario before looking for a memorised answer.
✗
Secret Manager
Why it's wrong here
Secret Manager is for storing API keys, passwords, and certificates, not encryption keys for GCP services.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between Cloud KMS as the centralized key management service and Cloud HSM as a hardware-backed option within Cloud KMS, leading candidates to choose Cloud HSM when the question asks for the centralized service.
Detailed technical explanation
How to think about this question
Cloud KMS uses a hierarchical key management model with key rings and cryptographic keys, where each key can be used for symmetric encryption (AES-256) or asymmetric signing/encryption (RSA, EC). It integrates with Cloud Audit Logs to record every key use and rotation event, enabling compliance with regulations like GDPR and PCI DSS. A subtle behavior is that when you use CMEK with Cloud Storage, the key is used to wrap a data encryption key (DEK) that actually encrypts the object, and Cloud KMS never leaves Google's infrastructure.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Design for security and compliance — This question tests Design for security and compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Key Management Service (Cloud KMS) — Cloud KMS is the correct choice because it provides a centralized, managed service for creating, rotating, and destroying encryption keys used by Google Cloud services. It integrates directly with services like Cloud Storage, BigQuery, and Compute Engine to enforce encryption at rest, and it supports customer-managed encryption keys (CMEK) for granular control. For data in transit, Cloud KMS can be used to manage keys for TLS or application-level encryption, though Google Cloud automatically encrypts all network traffic by default.
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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Question Discussion
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