- A
Use Cloud KMS software keys (protection level: SOFTWARE) with Cloud Storage CMEK.
Why wrong: Software keys are stored in software (not HSM), which doesn't meet the HSM requirement. SOFTWARE protection level keys are also technically exportable from a design standpoint.
- B
Use Cloud KMS HSM-backed keys (protection level: HSM) with Cloud Storage CMEK.
HSM protection level keys are generated and stored inside FIPS 140-2 Level 3 HSMs. They are non-exportable by design. CMEK with Cloud KMS HSM keys gives your team control while meeting HSM and non-exportability requirements.
- C
Use Customer-Supplied Encryption Keys (CSEK) managed by your security team.
Why wrong: CSEK requires the customer to supply key material with every API call — your security team would need to store the key externally (not in HSM). Also, CSEK has no HSM backing in GCP.
- D
Enable Google-managed encryption with HSM by selecting it in Cloud Storage settings.
Why wrong: Google-managed encryption uses Google's key management, not your security team's control. There's no user-facing option to select HSM for Google-managed keys.
Quick Answer
The answer is to use Cloud KMS HSM-backed keys with Cloud Storage CMEK. This configuration is correct because Cloud KMS HSM-backed keys operate at the HSM protection level, meaning the key material is generated and stored exclusively within a FIPS 140-2 Level 3 certified Hardware Security Module, making them non-exportable by design. When you apply these keys as a Customer-Managed Encryption Key (CMEK) to a Cloud Storage bucket, your security team retains full control over key rotation, access, and disabling, while the HSM ensures the keys never leave secure hardware. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of the distinction between software-backed keys (protection level: software) and HSM-backed keys, and the common trap is assuming that any CMEK key satisfies an HSM requirement. Remember the memory tip: "HSM means no export, CMEK means you control the bucket."
Google ACE Configuring access and security Practice Question
This ACE practice question tests your understanding of configuring access and security. 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.
Your company's compliance policy requires that all customer data stored in Cloud Storage must be encrypted using keys stored in a Hardware Security Module (HSM). The encryption keys must be managed by your security team and must not be exportable. Which configuration meets these requirements?
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
Use Cloud KMS HSM-backed keys (protection level: HSM) with Cloud Storage CMEK.
Option B is correct because Cloud KMS HSM-backed keys (protection level: HSM) ensure that encryption keys are stored in a Hardware Security Module, are managed by the security team, and are non-exportable by design. When used with Cloud Storage CMEK, this configuration meets the compliance requirement for HSM-based key storage with full customer control and no key export capability.
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.
- ✗
Use Cloud KMS software keys (protection level: SOFTWARE) with Cloud Storage CMEK.
Why it's wrong here
Software keys are stored in software (not HSM), which doesn't meet the HSM requirement. SOFTWARE protection level keys are also technically exportable from a design standpoint.
- ✓
Use Cloud KMS HSM-backed keys (protection level: HSM) with Cloud Storage CMEK.
Why this is correct
HSM protection level keys are generated and stored inside FIPS 140-2 Level 3 HSMs. They are non-exportable by design. CMEK with Cloud KMS HSM keys gives your team control while meeting HSM and non-exportability requirements.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Customer-Supplied Encryption Keys (CSEK) managed by your security team.
Why it's wrong here
CSEK requires the customer to supply key material with every API call — your security team would need to store the key externally (not in HSM). Also, CSEK has no HSM backing in GCP.
- ✗
Enable Google-managed encryption with HSM by selecting it in Cloud Storage settings.
Why it's wrong here
Google-managed encryption uses Google's key management, not your security team's control. There's no user-facing option to select HSM for Google-managed keys.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between customer-managed keys (CMEK) and customer-supplied keys (CSEK), where candidates mistakenly think CSEK provides HSM-level protection or that Google-managed encryption can be configured to use an HSM, but neither meets the non-exportable, HSM-backed requirement.
Detailed technical explanation
How to think about this question
Cloud KMS HSM-backed keys are generated and stored within FIPS 140-2 Level 3 certified HSMs, ensuring that the key material never leaves the HSM boundary in plaintext. When used with Cloud Storage CMEK, the key is used to wrap a Cloud Storage-managed data encryption key (DEK) via envelope encryption, and the HSM key itself remains non-exportable, enforced by the HSM firmware. In a real-world scenario, this setup is critical for compliance with regulations like PCI DSS or HIPAA that mandate hardware-based key protection and strict access controls.
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?
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Cloud KMS HSM-backed keys (protection level: HSM) with Cloud Storage CMEK. — Option B is correct because Cloud KMS HSM-backed keys (protection level: HSM) ensure that encryption keys are stored in a Hardware Security Module, are managed by the security team, and are non-exportable by design. When used with Cloud Storage CMEK, this configuration meets the compliance requirement for HSM-based key storage with full customer control and no key export capability.
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.
About these practice questions
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 →
Last reviewed: Jun 30, 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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