The answer is to use Shared VPC with a host project and attach service projects. This is correct because Shared VPC enables a centralized network model where the host project owns the VPC, subnets, and firewall rules, while each service project retains independent administrative control over its own resources and permissions. For the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of how to balance centralized network governance with project-level isolation, a common requirement in large organizations. A frequent trap is confusing Shared VPC with VPC Peering, but remember that Shared VPC allows multiple projects to use subnets from a single VPC without transitive routing complexities. Memory tip: think of the host project as the landlord who owns the building (the common VPC network) and each service project as a tenant with its own key (administrative control) to its specific room (subnet).
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 company has multiple projects that each need their own administrative control but must share a common VPC network. Which networking solution should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Shared VPC with the host project and attach service projects.
Shared VPC allows an organization to connect resources from multiple projects to a common VPC network, enabling centralized control of the network while maintaining administrative isolation for each project. The host project owns the VPC and firewall rules, and service projects can use subnets within that VPC, meeting the requirement for separate administrative control with a shared network.
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.
✗
Create a single VPC in one project and grant all users access to that project.
Why it's wrong here
Compromises administrative boundaries and security.
✗
Create separate VPCs for each project and connect via Cloud VPN.
Use Shared VPC with the host project and attach service projects.
Why this is correct
Provides centralized network management with per-project resource control.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a VPC in each project and peer them all together.
Why it's wrong here
Requires full-mesh peering, increasing complexity and overhead.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC peering (Option D) with Shared VPC, not realizing that peering does not allow a single common VPC network and lacks centralized administrative control, while Shared VPC is designed exactly for this use case.
Detailed technical explanation
How to think about this question
Shared VPC uses the concept of a host project and service projects, where the host project contains the VPC network and subnets, and service projects can use those subnets via IAM roles like `compute.subnetworks.user`. Under the hood, this is implemented using Google Cloud's VPC network virtualization, which allows VMs in service projects to have IP addresses from the host project's subnets, with all traffic flowing through the host project's firewall rules. In a real-world scenario, this is ideal for organizations with multiple teams (e.g., dev, test, prod) that need separate project boundaries for billing and permissions but share a common network for connectivity and security policy enforcement.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 Shared VPC with the host project and attach service projects. — Shared VPC allows an organization to connect resources from multiple projects to a common VPC network, enabling centralized control of the network while maintaining administrative isolation for each project. The host project owns the VPC and firewall rules, and service projects can use subnets within that VPC, meeting the requirement for separate administrative control with a shared network.
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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