- A
Configure a VPC Service Controls perimeter that includes the Cloud Storage bucket and the KMS key.
VPC Service Controls restrict data exfiltration by preventing access from outside the perimeter.
- B
Use Cloud HSM to create and manage the encryption key, and disable Cloud Audit Logs for the HSM key.
Why wrong: Cloud HSM provides hardware-backed keys but still uses KMS; disabling audit logs contradicts the requirement for logging.
- C
Enable default encryption (Google-managed key) on the bucket and use Cloud Audit Logs to monitor access.
Why wrong: Default encryption uses Google-managed keys, not customer-managed, so it does not meet the requirement for CMEK.
- D
Use customer-supplied encryption keys (CSEK) and store the key in Cloud Key Management Service (KMS).
Why wrong: CSEK keys are supplied by the customer but not managed via KMS; they are provided with each request and not stored in KMS.
- E
Create a Cloud KMS key ring and key, and configure the bucket to use CMEK with that key. Enable Cloud Audit Logs for the KMS key.
CMEK with KMS allows customer-managed keys and logging of key usage via Cloud Audit Logs.
Quick Answer
The correct answer involves two steps: creating a Cloud KMS key ring and key with CMEK for the bucket, and enabling Cloud Audit Logs for that key. This works because customer-managed encryption keys (CMEK) give you control over the encryption of data at rest in Cloud Storage, while Cloud Audit Logs capture every access attempt to the key, satisfying the logging requirement. To prevent data exfiltration, VPC Service Controls create a security perimeter around both the bucket and the KMS key, blocking unauthorized service accounts from decrypting data outside that boundary. On the Google Professional Cloud Security Engineer exam, this scenario tests your ability to combine encryption governance with network-based data loss prevention—a common trap is confusing VPC Service Controls with IAM permissions alone. Remember the memory tip: "CMEK for encryption, VPC SC for exfiltration, audit logs for accountability."
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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.
You are a security engineer for a healthcare organization. You need to protect sensitive patient data stored in Cloud Storage. You want to ensure that data is encrypted at rest using a customer-managed key (CMEK) and that access to the key is logged. You also need to prevent data exfiltration by limiting which service accounts can decrypt data. Which TWO steps should you take? (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
Configure a VPC Service Controls perimeter that includes the Cloud Storage bucket and the KMS key.
Option A is correct because VPC Service Controls creates a security perimeter around the Cloud Storage bucket and the KMS key, preventing data exfiltration by blocking unauthorized service accounts from decrypting data outside the perimeter. Option E is correct because creating a Cloud KMS key ring and key, configuring the bucket to use CMEK, and enabling Cloud Audit Logs for the KMS key ensures encryption at rest with a customer-managed key and logs all access to the key, meeting both 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.
- ✓
Configure a VPC Service Controls perimeter that includes the Cloud Storage bucket and the KMS key.
Why this is correct
VPC Service Controls restrict data exfiltration by preventing access from outside the perimeter.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Cloud HSM to create and manage the encryption key, and disable Cloud Audit Logs for the HSM key.
Why it's wrong here
Cloud HSM provides hardware-backed keys but still uses KMS; disabling audit logs contradicts the requirement for logging.
- ✗
Enable default encryption (Google-managed key) on the bucket and use Cloud Audit Logs to monitor access.
Why it's wrong here
Default encryption uses Google-managed keys, not customer-managed, so it does not meet the requirement for CMEK.
- ✗
Use customer-supplied encryption keys (CSEK) and store the key in Cloud Key Management Service (KMS).
Why it's wrong here
CSEK keys are supplied by the customer but not managed via KMS; they are provided with each request and not stored in KMS.
- ✓
Create a Cloud KMS key ring and key, and configure the bucket to use CMEK with that key. Enable Cloud Audit Logs for the KMS key.
Why this is correct
CMEK with KMS allows customer-managed keys and logging of key usage via Cloud Audit Logs.
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 CMEK and CSEK, where candidates mistakenly think CSEK can be stored in Cloud KMS for management, but CSEK is provided per request and not stored, while CMEK is fully managed in Cloud KMS with audit logging capabilities.
Detailed technical explanation
How to think about this question
VPC Service Controls uses context-aware access policies to restrict data movement based on the identity and context of the requester, effectively creating a data exfiltration barrier even if a service account is compromised. Cloud KMS CMEK integrates with Cloud Audit Logs to record every Decrypt, Encrypt, and GetPublicKey operation, which is critical for compliance with HIPAA and other healthcare regulations. The key ring and key hierarchy in Cloud KMS allows for granular IAM permissions, enabling you to limit decryption to specific service accounts via roles like 'Cloud KMS CryptoKey Decrypter'.
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 PCSE question test?
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: Configure a VPC Service Controls perimeter that includes the Cloud Storage bucket and the KMS key. — Option A is correct because VPC Service Controls creates a security perimeter around the Cloud Storage bucket and the KMS key, preventing data exfiltration by blocking unauthorized service accounts from decrypting data outside the perimeter. Option E is correct because creating a Cloud KMS key ring and key, configuring the bucket to use CMEK, and enabling Cloud Audit Logs for the KMS key ensures encryption at rest with a customer-managed key and logs all access to the key, meeting both 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.
About these practice questions
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Last reviewed: Jun 30, 2026
This PCSE 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 PCSE exam.
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