The answer is to use separate VPCs for each environment, connected via VPC Network Peering. This approach is correct because PCI DSS requires strict network segmentation to isolate cardholder data environments, and separate VPCs provide complete network-layer isolation, preventing any accidental cross-environment traffic. VPC Network Peering then enables controlled, encrypted communication between these isolated VPCs without merging routing domains or security policies, preserving the security boundary. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding that PCI DSS compliance demands logical separation, not just firewall rules—a common trap is assuming a single VPC with subnets and firewall policies is sufficient, which fails the segmentation requirement. Remember the memory tip: “Peering, not merging”—peering connects VPCs without collapsing their isolation, keeping each environment’s routing and security fully independent.
PCNE Practice Question: Designing, planning, and prototyping a GCP network
This PCNE practice question tests your understanding of designing, planning, and prototyping a gcp network. 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 network engineer is designing a Google Cloud network for a financial services company that requires strict compliance with PCI DSS. They need to isolate development, staging, and production environments. Which approach should they use to meet 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 separate VPCs for each environment, connected via VPC Network Peering
Option D is correct because PCI DSS requires strict network segmentation between environments handling cardholder data. Separate VPCs provide complete isolation at the network layer, preventing any accidental cross-environment traffic. VPC Network Peering allows controlled, encrypted communication between these isolated VPCs without reducing the security boundary, as peering does not merge routing domains or security policies.
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 a single VPC with separate subnets for each environment and firewall rules to restrict traffic
Why it's wrong here
Firewall rules can be misconfigured, and a single VPC may not provide the required isolation for PCI DSS.
✗
Use a single VPC with separate firewall rules for each environment
Why it's wrong here
Relies solely on firewall rules, which may not satisfy compliance auditors.
✗
Use a Shared VPC with separate service projects for each environment
Why it's wrong here
Shared VPC reduces isolation as all environments share the same host VPC.
✓
Use separate VPCs for each environment, connected via VPC Network Peering
Why this is correct
Separate VPCs provide strong isolation, and peering can be used if controlled communication is needed.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse logical segmentation (subnets and firewall rules) with physical or hard segmentation, assuming that firewall rules alone can enforce PCI DSS isolation, but the exam expects a design that creates separate administrative and routing domains.
Detailed technical explanation
How to think about this question
VPC Network Peering uses the internal Google Cloud infrastructure to exchange routes between VPCs without requiring a VPN or external IP addresses; it leverages RFC 1918 address space and supports global peering across regions. Under the hood, peering establishes a direct, low-latency connection using Google's private backbone, but each VPC retains its own firewall rules, routes, and subnet ranges, ensuring that no traffic can flow unless explicitly allowed by both sides. In a real-world PCI DSS audit, separate VPCs with peering demonstrate a clear network segmentation boundary that satisfies Requirement 1.2.1 for isolating cardholder data environments.
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 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
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.
Designing, planning, and prototyping a GCP network — This question tests Designing, planning, and prototyping a GCP network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use separate VPCs for each environment, connected via VPC Network Peering — Option D is correct because PCI DSS requires strict network segmentation between environments handling cardholder data. Separate VPCs provide complete isolation at the network layer, preventing any accidental cross-environment traffic. VPC Network Peering allows controlled, encrypted communication between these isolated VPCs without reducing the security boundary, as peering does not merge routing domains or security policies.
What should I do if I get this PCNE 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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