Quick Answer
The answer is Shared VPC, which is the correct choice because it provides the three required components: a host project, service projects, and independent firewall rules. In this architecture, the host project enables centralized network administration by managing the shared VPC network and its subnets, while each service project can host its own resources like Compute Engine instances and apply its own firewall rules, meeting the need for multiple projects with separate security policies. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of how Shared VPC decouples network control from resource ownership—a common trap is assuming that all firewall rules must be managed centrally in the host project, but in reality, service projects can define their own ingress and egress rules within the shared subnets. A useful memory tip: think of the host project as the “landlord” managing the building’s network infrastructure, while each service project is a “tenant” that can lock its own doors with custom firewall rules.
This PCNE practice question tests your understanding of implementing a virtual private cloud. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is designing a VPC for a production environment that must meet the following requirements: support multiple projects, centralized network administration, and allow each project to have its own firewall rules. Which THREE components should be used?
Service projects
Service projects consume Shared VPC networks.
Host project
The host project contains the Shared VPC network.
Cloud VPN
Why wrong: Cloud VPN is for connecting on-premises, not for multi-project VPC.
VPC peering
Why wrong: VPC peering is not needed when using Shared VPC.
Shared VPC
Shared VPC enables centralized network management across projects.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Service projects
A is correct because service projects in a Shared VPC architecture allow each project to host its own resources (e.g., Compute Engine instances) while maintaining separate firewall rules and security policies. This enables centralized network administration via the host project while giving each project autonomy over its own firewall configurations, meeting the requirement for multiple projects with independent firewall rules.
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.
Service projects
Why this is correct
Service projects consume Shared VPC networks.
Related concept
Read the scenario before looking for a memorised answer.
Host project
Why this is correct
The host project contains the Shared VPC network.
Related concept
Read the scenario before looking for a memorised answer.
Cloud VPN
Why it's wrong here
Cloud VPN is for connecting on-premises, not for multi-project VPC.
VPC peering
Why it's wrong here
VPC peering is not needed when using Shared VPC.
Shared VPC
Why this is correct
Shared VPC enables centralized network management across projects.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Google Cloud often tests the distinction between connectivity solutions (Cloud VPN, VPC peering) and network administration models (Shared VPC), leading candidates to mistakenly choose VPC peering for multi-project setups when Shared VPC is required for centralized control with per-project firewall rules.
Detailed technical explanation
Shared VPC uses a host project to define the VPC network and subnets, while service projects attach to the host project and can create resources in those subnets. Each service project can define its own firewall rules (via VPC firewall policies or hierarchical firewall policies) that apply only to resources in that project, enabling granular security isolation. Under the hood, Shared VPC leverages XPN (Cross-Project Networking) APIs to propagate network configurations from the host project to service projects, ensuring consistent routing and subnet allocation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Implementing a Virtual Private Cloud — This question tests Implementing a Virtual Private Cloud — Read the scenario before looking for a memorised answer..
The correct answer is: Service projects — A is correct because service projects in a Shared VPC architecture allow each project to host its own resources (e.g., Compute Engine instances) while maintaining separate firewall rules and security policies. This enables centralized network administration via the host project while giving each project autonomy over its own firewall configurations, meeting the requirement for multiple projects with independent firewall rules.
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 30, 2026
This PCNE 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 PCNE exam.
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