- A
Enable Shared VPC in the host project, then attach service projects, then grant IAM roles to service project users, then deploy resources in service projects.
This order follows the recommended Google Cloud process: first enable Shared VPC on the host project, then attach service projects, then grant IAM permissions (e.g., compute.networkUser) so service projects can use subnets, and finally deploy resources. It ensures prerequisites are met at each step.
- B
Attach service projects to the host project, then enable Shared VPC in the host project, then grant IAM roles, then deploy resources.
Why wrong: This is incorrect because you cannot attach service projects before enabling Shared VPC on the host project. The host project must first have Shared VPC enabled to allow attachments.
- C
Enable Shared VPC in the host project, then grant IAM roles to service project users, then attach service projects, then deploy resources.
Why wrong: This is incorrect because IAM roles for subnet usage should be granted after attaching service projects. Without attachment, the service project is not yet associated, and IAM roles may not apply correctly to the shared VPC resources.
- D
Enable Shared VPC in the host project, then attach service projects, then deploy resources in service projects, then grant IAM roles.
Why wrong: This is incorrect because deploying resources before granting IAM roles would cause failures. Service projects need the compute.networkUser role (or equivalent) to use subnets. Without permissions, resource creation will be denied.
Shared VPC Setup for Multi-Project Environment
This PCA practice question tests your understanding of design for security and compliance. 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.
Drag and drop the steps to set up a shared VPC in Google Cloud for a multi-project environment into the correct order.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable Shared VPC in the host project, then attach service projects, then grant IAM roles to service project users, then deploy resources in service projects.
The host project holds the VPC network. Service projects use the subnets. IAM roles control who can use the subnets.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable Shared VPC in the host project, then attach service projects, then grant IAM roles to service project users, then deploy resources in service projects.
Why this is correct
This order follows the recommended Google Cloud process: first enable Shared VPC on the host project, then attach service projects, then grant IAM permissions (e.g., compute.networkUser) so service projects can use subnets, and finally deploy resources. It ensures prerequisites are met at each step.
Related concept
CIDR notation defines the prefix length.
- ✗
Attach service projects to the host project, then enable Shared VPC in the host project, then grant IAM roles, then deploy resources.
Why it's wrong here
This is incorrect because you cannot attach service projects before enabling Shared VPC on the host project. The host project must first have Shared VPC enabled to allow attachments.
- ✗
Enable Shared VPC in the host project, then grant IAM roles to service project users, then attach service projects, then deploy resources.
Why it's wrong here
This is incorrect because IAM roles for subnet usage should be granted after attaching service projects. Without attachment, the service project is not yet associated, and IAM roles may not apply correctly to the shared VPC resources.
- ✗
Enable Shared VPC in the host project, then attach service projects, then deploy resources in service projects, then grant IAM roles.
Why it's wrong here
This is incorrect because deploying resources before granting IAM roles would cause failures. Service projects need the compute.networkUser role (or equivalent) to use subnets. Without permissions, resource creation will be denied.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCA subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this PCA question test?
Design for security and compliance — This question tests Design for security and compliance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Enable Shared VPC in the host project, then attach service projects, then grant IAM roles to service project users, then deploy resources in service projects. — The host project holds the VPC network. Service projects use the subnets. IAM roles control who can use the subnets.
What should I do if I get this PCA question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCA subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 11, 2026
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