Quick Answer
The correct answer is to use Customer-Managed Encryption Keys (CMEK) and VPC Service Controls. CMEK gives you direct control over the encryption keys protecting data at rest in Cloud Dataflow, satisfying strict compliance requirements for sensitive healthcare data, while VPC Service Controls create a security perimeter that prevents data exfiltration and enforces end-to-end encryption boundaries. On the Google Professional Data Engineer exam, this combination tests your understanding of how to layer data governance controls—CMEK handles key sovereignty, and VPC Service Controls restrict data movement across networks. A common trap is to confuse CMEK with CSEK (Customer-Supplied Encryption Keys), which are less flexible and not recommended for long-term compliance. Remember the memory tip: "Keys for the vault, perimeters for the exfiltration"—CMEK locks the data at rest, and VPC Service Controls lock the data in transit.
This PDE practice question tests your understanding of designing data processing systems. 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 company needs to process sensitive healthcare data with strict compliance requirements. They want to use Cloud Dataflow but must ensure data is encrypted end-to-end and audit logs are retained. Which combination of features should they enable?
Use Customer-Managed Encryption Keys (CMEK) and VPC Service Controls.
Provides control and exfiltration prevention.
Use Data Loss Prevention API to redact sensitive data.
Why wrong: Not encryption.
Enable Cloud Audit Logs and VPC Service Controls.
Why wrong: Missing encryption control.
Enable default encryption at rest and in transit.
Why wrong: No customer-managed keys.
Answer choices
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 VPC Service Controls.
Option A is correct because Customer-Managed Encryption Keys (CMEK) allow the company to control the encryption keys used to protect data at rest in Cloud Dataflow, while VPC Service Controls provide a security perimeter that prevents data exfiltration and ensures end-to-end encryption boundaries. Together, they address the compliance requirement for encryption control and audit logging by restricting data movement within a VPC service perimeter and using customer-managed keys for data encryption.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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 VPC Service Controls.
Why this is correct
Provides control and exfiltration prevention.
Related concept
Read the scenario before looking for a memorised answer.
Use Data Loss Prevention API to redact sensitive data.
Why it's wrong here
Not encryption.
Enable Cloud Audit Logs and VPC Service Controls.
Why it's wrong here
Missing encryption control.
Enable default encryption at rest and in transit.
Why it's wrong here
No customer-managed keys.
Common exam traps
The trap here is that candidates often assume default encryption (Option D) or audit logs alone (Option C) satisfy compliance requirements, but they overlook the need for customer-managed keys and network-level exfiltration controls that VPC Service Controls provide.
Detailed technical explanation
CMEK in Cloud Dataflow integrates with Cloud Key Management Service (KMS) to wrap Data Encryption Keys (DEKs) using a Customer-Managed Key (CMK), ensuring that Google cannot access the plaintext keys. VPC Service Controls extend this by creating a service perimeter around Dataflow resources, blocking data movement to unauthorized networks or identities, and enforcing context-aware access policies. In a real-world healthcare scenario, this combination ensures that even if a worker node is compromised, data cannot be exfiltrated outside the perimeter, and all key usage is logged in Cloud Audit Logs for compliance.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
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FAQ
Designing data processing systems — This question tests Designing data processing systems — Read the scenario before looking for a memorised answer..
The correct answer is: Use Customer-Managed Encryption Keys (CMEK) and VPC Service Controls. — Option A is correct because Customer-Managed Encryption Keys (CMEK) allow the company to control the encryption keys used to protect data at rest in Cloud Dataflow, while VPC Service Controls provide a security perimeter that prevents data exfiltration and ensures end-to-end encryption boundaries. Together, they address the compliance requirement for encryption control and audit logging by restricting data movement within a VPC service perimeter and using customer-managed keys for data encryption.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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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