This PCSE practice question tests your understanding of ensuring data protection. 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 security engineer is designing data protection for Cloud Storage. Which TWO methods can be used to enforce encryption at rest for objects? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Setting a bucket-level default encryption with a CMEK key.
Option A is correct because setting a bucket-level default encryption with a CMEK (Customer-Managed Encryption Key) ensures that all new objects written to the bucket are encrypted at rest using a key managed by the customer in Cloud KMS. This enforces encryption at rest at the bucket level, meeting the requirement.
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.
✓
Setting a bucket-level default encryption with a CMEK key.
Why this is correct
This ensures all objects uploaded to the bucket are encrypted with the specified CMEK key.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enabling VPC Service Controls.
Why it's wrong here
VPC SC provides perimeter security, not encryption enforcement.
✗
Applying a retention policy.
Why it's wrong here
Retention policies prevent object deletion, not enforce encryption.
✗
Using a bucket policy that requires the x-goog-encryption header for uploads.
Why it's wrong here
This enforces CSEK headers, not encryption at rest with a specific key.
✓
Using an Organization Policy to enforce CMEK at the project level.
Why this is correct
Organization policies can require CMEK for all Cloud Storage buckets in the project.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between encryption at rest (server-side) and encryption in transit or client-side encryption, leading candidates to mistakenly choose options like D that enforce client-side headers rather than server-side encryption at rest.
Detailed technical explanation
How to think about this question
CMEK uses Cloud KMS to wrap a data encryption key (DEK) that encrypts object data; the DEK is stored alongside the object and decrypted only when accessed. Bucket-level default encryption applies to new objects, but existing objects remain unencrypted unless rewritten. In a real-world scenario, combining CMEK with Organization Policy constraints (Option E) ensures all buckets in a project use CMEK, preventing misconfiguration.
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.
Ensuring data protection — This question tests Ensuring data protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Setting a bucket-level default encryption with a CMEK key. — Option A is correct because setting a bucket-level default encryption with a CMEK (Customer-Managed Encryption Key) ensures that all new objects written to the bucket are encrypted at rest using a key managed by the customer in Cloud KMS. This enforces encryption at rest at the bucket level, meeting the requirement.
What should I do if I get this PCSE 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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