The correct combination is customer-managed encryption keys (CMEK) with Cloud KMS and VPC Service Controls. This works because CMEK gives the organization direct control over the encryption keys protecting PHI at rest in Cloud Storage, while VPC Service Controls create a data security perimeter that restricts access based on data classification, ensuring only authorized personnel within that perimeter can reach the protected data. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of how to layer encryption and access control for PHI in cloud storage, often appearing as a trap where candidates mistakenly choose Cloud HSM alone or rely solely on IAM policies. The key distinction is that IAM controls who can access a bucket, but VPC Service Controls prevent data exfiltration by blocking access from outside the defined perimeter, which is critical for healthcare compliance. Memory tip: think of CMEK as the lock on the data and VPC Service Controls as the fence around the entire parking lot.
PCSE Supporting compliance requirements Practice Question
This PCSE practice question tests your understanding of supporting compliance requirements. 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.
A healthcare organization must ensure that only authorized personnel can access Protected Health Information (PHI) stored in Cloud Storage. They need to enforce encryption at rest and control access based on data classification. Which combination of Google Cloud services should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use customer-managed encryption keys (CMEK) with Cloud KMS and VPC Service Controls.
Option D is correct because it combines customer-managed encryption keys (CMEK) with Cloud KMS to enforce encryption at rest using keys controlled by the organization, and VPC Service Controls to restrict data access based on data classification by creating a security perimeter around Cloud Storage. This ensures that only authorized personnel within the defined perimeter can access PHI, meeting both encryption and access control requirements.
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 customer-supplied encryption keys (CSEK) and Cloud Audit Logs.
Why it's wrong here
CSEK shifts key management to the customer and does not provide network-level controls.
✗
Use Cloud HSM for key management and Cloud DLP to inspect data.
Why it's wrong here
Cloud DLP is for classification and de-identification, not for access control perimeters.
✗
Enable Access Transparency and use Organization Policies to restrict resource locations.
Why it's wrong here
Access Transparency logs but does not enforce access controls.
✓
Use customer-managed encryption keys (CMEK) with Cloud KMS and VPC Service Controls.
Why this is correct
CMEK provides key control; VPC Service Controls prevent data exfiltration beyond the perimeter.
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 key management (CMEK vs. CSEK) and access control mechanisms (VPC Service Controls vs. IAM), where candidates mistakenly choose options that address only one requirement or confuse data inspection (DLP) with access enforcement.
Detailed technical explanation
How to think about this question
CMEK with Cloud KMS allows you to manage encryption keys via Cloud KMS, which integrates with Cloud Storage to encrypt data at rest using envelope encryption, where a key encryption key (KEK) from KMS wraps a data encryption key (DEK). VPC Service Controls extend beyond IAM by creating a security perimeter that prevents data exfiltration and restricts access to Cloud Storage based on the classification of the data, using context-aware access policies that can include attributes like data classification labels.
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.
Supporting compliance requirements — This question tests Supporting compliance requirements — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use customer-managed encryption keys (CMEK) with Cloud KMS and VPC Service Controls. — Option D is correct because it combines customer-managed encryption keys (CMEK) with Cloud KMS to enforce encryption at rest using keys controlled by the organization, and VPC Service Controls to restrict data access based on data classification by creating a security perimeter around Cloud Storage. This ensures that only authorized personnel within the defined perimeter can access PHI, meeting both encryption and access control requirements.
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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