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.
Which TWO of the following are benefits of using Shared VPC?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Automatic cross-project routing
Shared VPC allows an organization to connect resources from multiple projects to a common VPC network, enabling automatic cross-project routing. This is because all subnets in the host project are directly reachable from any service project attached to that host, without needing additional VPC peering or VPN tunnels. Option B is correct because this inherent routing simplifies network connectivity and reduces administrative overhead.
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.
✗
Enhanced security through VPC Service Perimeters
Why it's wrong here
Service Perimeters are an independent feature, not part of Shared VPC.
✓
Automatic cross-project routing
Why this is correct
Service project VMs automatically communicate using host project's routes.
Related concept
Read the scenario before looking for a memorised answer.
✓
Centralized firewall rule management
Why this is correct
Firewall rules are defined in the host project and apply to all service projects.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reduced IP address usage
Why it's wrong here
IP address usage is not reduced; subnets are still allocated.
✗
Separation of network and application teams
Why it's wrong here
Shared VPC does not enforce team separation; it can be structured that way but not a benefit per se.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Shared VPC inherently provides security features like VPC Service Perimeters, when in fact those are separate controls; the trap here is confusing the administrative separation of network and application teams as a direct benefit of Shared VPC, rather than recognizing that the core technical benefit is automatic cross-project routing and centralized firewall rule management.
Detailed technical explanation
How to think about this question
Under the hood, Shared VPC uses the concept of a host project that contains the VPC network and its subnets, while service projects are attached via a Shared VPC Admin API that grants IAM roles for subnet usage. The automatic cross-project routing is achieved because all service project resources are effectively part of the same VPC, so routes are propagated via the same routing tables and dynamic routing (e.g., BGP with Cloud Router) applies uniformly. In a real-world scenario, a company with multiple teams can deploy microservices in separate service projects but still have them communicate over a single VPC without complex peering, simplifying compliance and audit trails.
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: Automatic cross-project routing — Shared VPC allows an organization to connect resources from multiple projects to a common VPC network, enabling automatic cross-project routing. This is because all subnets in the host project are directly reachable from any service project attached to that host, without needing additional VPC peering or VPN tunnels. Option B is correct because this inherent routing simplifies network connectivity and reduces administrative overhead.
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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