- A
Google-managed encryption keys (the default)
Why wrong: With GMEK, Google creates, stores, and manages encryption keys — the customer has no control over the keys and Google can theoretically access the data.
- B
Customer-managed encryption keys (CMEK) using Cloud KMS
CMEK keys are created and controlled by the customer in Cloud KMS. GCP encrypts data using these keys, but the customer retains full control — including the ability to revoke access.
- C
Client-side encryption before uploading to Cloud Storage, without using Cloud KMS
Why wrong: Client-side encryption works technically, but it doesn't use GCP's key management infrastructure — audit logging, key rotation, and IAM-based access control for keys are all missing.
- D
Shielded VM with vTPM enabled on the storage backend
Why wrong: Shielded VM protects VM integrity (boot security) — it doesn't control encryption keys for Cloud Storage objects.
Google ACE Practice Question: An enterprise stores sensitive customer data in…
This ACE practice question tests your understanding of ace exam topics. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An enterprise stores sensitive customer data in Cloud Storage. Regulatory requirements mandate that the company controls its own encryption keys — Google must not be able to decrypt data unilaterally. Which encryption configuration satisfies this?
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
Customer-managed encryption keys (CMEK) using Cloud KMS
Option B is correct because Customer-Managed Encryption Keys (CMEK) with Cloud KMS allow the enterprise to control and manage their own encryption keys, ensuring that Google cannot unilaterally decrypt the data. With CMEK, the encryption keys are stored in Cloud KMS under the customer's control, and Google only has access to the key material for encryption/decryption operations as authorized by the customer. This satisfies the regulatory requirement that the company retains sole control over key material, preventing Google from decrypting data without explicit permission.
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.
- ✗
Google-managed encryption keys (the default)
Why it's wrong here
With GMEK, Google creates, stores, and manages encryption keys — the customer has no control over the keys and Google can theoretically access the data.
- ✓
Customer-managed encryption keys (CMEK) using Cloud KMS
Why this is correct
CMEK keys are created and controlled by the customer in Cloud KMS. GCP encrypts data using these keys, but the customer retains full control — including the ability to revoke access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Client-side encryption before uploading to Cloud Storage, without using Cloud KMS
Why it's wrong here
Client-side encryption works technically, but it doesn't use GCP's key management infrastructure — audit logging, key rotation, and IAM-based access control for keys are all missing.
- ✗
Shielded VM with vTPM enabled on the storage backend
Why it's wrong here
Shielded VM protects VM integrity (boot security) — it doesn't control encryption keys for Cloud Storage objects.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse client-side encryption (Option C) as always meeting compliance requirements, but the ACE exam tests that CMEK is the specific Google Cloud service that provides customer-controlled keys with full integration into Cloud Storage's access control and auditing, whereas client-side encryption lacks native key management and audit trails.
Detailed technical explanation
How to think about this question
CMEK uses Cloud KMS to wrap data encryption keys (DEKs) with a customer-controlled key encryption key (KEK) stored in Cloud KMS; Cloud Storage requests decryption of the DEK from Cloud KMS for each read/write operation, and the customer can revoke access by disabling or destroying the KEK. A subtle behavior is that CMEK still uses Google's server-side encryption infrastructure, but the key material is customer-managed, meaning Google cannot decrypt without the customer's Cloud KMS key being enabled. In a real-world scenario, if a company needs to meet HIPAA or PCI-DSS requirements that mandate separation of duties, CMEK provides audit logs in Cloud KMS for every key usage, which client-side encryption alone cannot offer.
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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FAQ
Questions learners often ask
What does this ACE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Customer-managed encryption keys (CMEK) using Cloud KMS — Option B is correct because Customer-Managed Encryption Keys (CMEK) with Cloud KMS allow the enterprise to control and manage their own encryption keys, ensuring that Google cannot unilaterally decrypt the data. With CMEK, the encryption keys are stored in Cloud KMS under the customer's control, and Google only has access to the key material for encryption/decryption operations as authorized by the customer. This satisfies the regulatory requirement that the company retains sole control over key material, preventing Google from decrypting data without explicit permission.
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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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
This ACE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ACE exam.
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