- A
Use gcloud storage buckets create with --encryption-key flag pointing to the KMS key.
Correct flag to specify CMEK during bucket creation.
- B
Create a key ring and cryptographic key in Cloud KMS.
Needed to create the CMEK.
- C
Use gsutil mb -o default_encryption_key=...
Why wrong: gsutil does not support CMEK at bucket creation; use gcloud storage buckets create with --encryption-key.
- D
Grant the Cloud Storage service account the Cloud KMS CryptoKey Encrypter/Decrypter role.
Why wrong: This is needed for CMEK but is not an action for creating the bucket; it's a prerequisite.
- E
Set default encryption on the bucket using gsutil defaulte encryption set.
Why wrong: This sets default encryption but not CMEK; it uses Google-managed keys or a CSEK file.
Question 41 of 1,000
Google ACE Deploying and Implementing a Cloud Solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 engineer needs to create a Cloud Storage bucket for storing sensitive financial data that must be encrypted at rest using a customer-managed encryption key (CMEK) stored in Cloud KMS. Which two actions are required? (Choose TWO.)
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 gcloud storage buckets create with --encryption-key flag pointing to the KMS key.
To use CMEK for Cloud Storage, you must first create a key ring and cryptographic key in Cloud KMS (Option B). Then, when creating the bucket, use the gcloud storage buckets create command with the --encryption-key flag pointing to that key (Option A). Option C is incorrect because gsutil mb does not support CMEK. Option D is incorrect because granting the Cloud Storage service account the KMS role is not required when using the --encryption-key flag; the necessary permissions are automatically handled. Option E sets default encryption on an existing bucket, not CMEK.
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 gcloud storage buckets create with --encryption-key flag pointing to the KMS key.
Why this is correct
Correct flag to specify CMEK during bucket creation.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Create a key ring and cryptographic key in Cloud KMS.
Why this is correct
Needed to create the CMEK.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use gsutil mb -o default_encryption_key=...
Why it's wrong here
gsutil does not support CMEK at bucket creation; use gcloud storage buckets create with --encryption-key.
- ✗
Grant the Cloud Storage service account the Cloud KMS CryptoKey Encrypter/Decrypter role.
Why it's wrong here
This is needed for CMEK but is not an action for creating the bucket; it's a prerequisite.
- ✗
Set default encryption on the bucket using gsutil defaulte encryption set.
Why it's wrong here
This sets default encryption but not CMEK; it uses Google-managed keys or a CSEK file.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Deploying and Implementing a Cloud Solution — study guide chapter
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FAQ
Questions learners often ask
What does this ACE question test?
Deploying and Implementing a Cloud Solution — This question tests Deploying and Implementing a Cloud Solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use gcloud storage buckets create with --encryption-key flag pointing to the KMS key. — To use CMEK for Cloud Storage, you must first create a key ring and cryptographic key in Cloud KMS (Option B). Then, when creating the bucket, use the gcloud storage buckets create command with the --encryption-key flag pointing to that key (Option A). Option C is incorrect because gsutil mb does not support CMEK. Option D is incorrect because granting the Cloud Storage service account the KMS role is not required when using the --encryption-key flag; the necessary permissions are automatically handled. Option E sets default encryption on an existing bucket, not CMEK.
What should I do if I get this ACE question wrong?
Identify which ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 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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