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.
An organization wants to use Shared VPC but restrict access to certain subnets for specific service projects. Which GCP feature should they use?
Subnet-level IAM bindings
Allows granular subnet access control for service projects.
VPC Network Peering
Why wrong: Peering connects whole VPCs, not subnet-level access.
VPC Service Perimeters
Why wrong: Service perimeters are for data security, not subnet access control.
Firewall rules
Why wrong: Firewall rules control traffic, not access to subnets.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Subnet-level IAM bindings
Subnet-level IAM bindings allow you to grant roles (e.g., compute.networkUser) on specific subnets within a Shared VPC to service project principals. This restricts access to only those subnets, while the service project can still use the shared network. It is the native GCP mechanism for fine-grained subnet access control in a Shared VPC environment.
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.
Subnet-level IAM bindings
Why this is correct
Allows granular subnet access control for service projects.
Related concept
Read the scenario before looking for a memorised answer.
VPC Network Peering
Why it's wrong here
Peering connects whole VPCs, not subnet-level access.
VPC Service Perimeters
Why it's wrong here
Service perimeters are for data security, not subnet access control.
Firewall rules
Why it's wrong here
Firewall rules control traffic, not access to subnets.
Common exam traps
The trap here is that candidates confuse VPC Service Perimeters (which control data boundaries for managed services) with subnet-level IAM (which controls compute resource access within a Shared VPC), leading them to pick Option C when the question explicitly asks about restricting access to subnets for service projects.
Detailed technical explanation
Under the hood, subnet-level IAM uses the same IAM system as project-level roles but scoped to the subnet resource via the `compute.subnetworks.use` and `compute.subnetworks.useExternalIp` permissions. When a service project attaches to a Shared VPC, you can bind a principal (e.g., a service account) to a specific subnet, and that principal will only be able to create VM instances in that subnet. A real-world scenario is a multi-tenant environment where each tenant's service project is restricted to a dedicated subnet for isolation, while still sharing the host project's VPC.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
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..
The correct answer is: Subnet-level IAM bindings — Subnet-level IAM bindings allow you to grant roles (e.g., compute.networkUser) on specific subnets within a Shared VPC to service project principals. This restricts access to only those subnets, while the service project can still use the shared network. It is the native GCP mechanism for fine-grained subnet access control in a Shared VPC environment.
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 24, 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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