The answer is to use Customer-Managed Encryption Keys (CMEK) and enable Cloud Audit Logs. This combination directly meets the requirements because CMEK gives you control over the encryption keys protecting data at rest in Cloud Storage and BigQuery, while Cloud Audit Logs record every access attempt to both the data and the key material, providing a complete audit trail for sensitive PII. On the Google Professional Data Engineer exam, this scenario tests your understanding of the shared responsibility model and the distinction between Google-managed, CMEK, and CSEK—a common trap is choosing CSEK for its added control, but CMEK is the correct balance for auditability and key rotation without the operational overhead of managing key servers. Remember the memory tip: “CMEK for control, Audit Logs for the trail.”
PDE Ensuring solution quality Practice Question
This PDE practice question tests your understanding of ensuring solution quality. 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 team is designing a data lake on Google Cloud using Cloud Storage and BigQuery. They need to ensure that sensitive data (e.g., PII) is encrypted at rest and have the ability to audit access. Which approach meets these requirements?
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) and enable Cloud Audit Logs.
Option B is correct because Customer-Managed Encryption Keys (CMEK) allow the team to control and manage the encryption keys used to protect data at rest in Cloud Storage and BigQuery, while enabling Cloud Audit Logs provides the necessary audit trail for access to both the data and the keys. This combination directly satisfies the requirements for encryption at rest and auditability.
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-Managed Encryption Keys (CMEK) and enable VPC Service Controls.
Why it's wrong here
VPC Service Controls reduce exfiltration risk but do not provide access auditing.
✓
Use Customer-Managed Encryption Keys (CMEK) and enable Cloud Audit Logs.
Why this is correct
CMEK provides control over encryption keys, and Cloud Audit Logs record access to data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Default Encryption and enable Data Loss Prevention (DLP) API.
Why it's wrong here
Default Encryption does not allow customer control over keys.
✗
Use Customer-Supplied Encryption Keys (CSEK) and enable VPC Service Controls.
Why it's wrong here
CSEK requires the customer to supply the key material, which may not be desirable for all scenarios.
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 vs. Default) and security controls (VPC Service Controls vs. Audit Logs), leading candidates to conflate network perimeter controls with audit capabilities.
Trap categories for this question
Scenario analysis trap
CSEK requires the customer to supply the key material, which may not be desirable for all scenarios.
Detailed technical explanation
How to think about this question
CMEK uses Cloud Key Management Service (Cloud KMS) to create and manage key encryption keys (KEKs) that wrap the data encryption keys (DEKs) used by Cloud Storage and BigQuery. Cloud Audit Logs capture Admin Activity and Data Access audit logs for both the KMS key operations and the data access events, providing a comprehensive audit trail. In a real-world scenario, this setup is critical for compliance with regulations like GDPR or HIPAA, where both encryption control and access monitoring are mandated.
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 solution quality — This question tests Ensuring solution quality — 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) and enable Cloud Audit Logs. — Option B is correct because Customer-Managed Encryption Keys (CMEK) allow the team to control and manage the encryption keys used to protect data at rest in Cloud Storage and BigQuery, while enabling Cloud Audit Logs provides the necessary audit trail for access to both the data and the keys. This combination directly satisfies the requirements for encryption at rest and auditability.
What should I do if I get this PDE 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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Match each data encryption concept to its description.
medium
Why : Encryption options in Google Cloud.
Last reviewed: Jun 30, 2026
Question Discussion
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This PDE 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 PDE exam.
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