- A
Dedicated Cloud VPN connections per tenant
Why wrong: Dedicated Cloud VPN connections per tenant do not provide isolation within the VPC and are used for hybrid connectivity, not multi-tenant isolation.
- B
Use a Shared VPC with separate subnets for each tenant and firewall rules to enforce isolation
Shared VPC with separate subnets per tenant and firewall rules allows centralized network security and logging while ensuring tenants are isolated.
- C
Single VPC with network tags and IAP tunnels
Why wrong: A single VPC with network tags and IAP tunnels does not enforce strict isolation between tenants as tags can be misconfigured, and IAP is for access control, not network isolation.
- D
Peered VPCs for each tenant with Cloud NAT
Why wrong: Peered VPCs for each tenant with Cloud NAT would create multiple VPCs, but this approach lacks centralized management and logging compared to a Shared VPC.
Google PCA Shared VPC Practice Question
This PCA practice question tests your understanding of design and plan a cloud solution architecture. 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. A key principle to apply: shared VPC. 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 architecture for a multi-tenant SaaS platform. Each tenant has isolated workloads that must not communicate with each other. They also need centralized network security and logging. Which VPC design meets these requirements?
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
Use a Shared VPC with separate subnets for each tenant and firewall rules to enforce isolation
Option B is correct because using a Shared VPC with separate subnets per tenant and firewall rules to enforce isolation provides centralized network security and logging while keeping tenants isolated. Option A is incorrect because dedicated Cloud VPN connections per tenant do not provide isolation within the VPC and are more for hybrid connectivity. Option C is incorrect because a single VPC with network tags and IAP tunnels does not enforce strict isolation between tenants and relies on tags which can be misconfigured. Option D is incorrect because peered VPCs for each tenant with Cloud NAT would create multiple VPCs but does not provide centralized management and logging as easily as a Shared VPC.
Key principle: Shared VPC
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Dedicated Cloud VPN connections per tenant
Why it's wrong here
Dedicated Cloud VPN connections per tenant do not provide isolation within the VPC and are used for hybrid connectivity, not multi-tenant isolation.
- ✓
Use a Shared VPC with separate subnets for each tenant and firewall rules to enforce isolation
Why this is correct
Shared VPC with separate subnets per tenant and firewall rules allows centralized network security and logging while ensuring tenants are isolated.
Related concept
Shared VPC
- ✗
Single VPC with network tags and IAP tunnels
Why it's wrong here
A single VPC with network tags and IAP tunnels does not enforce strict isolation between tenants as tags can be misconfigured, and IAP is for access control, not network isolation.
- ✗
Peered VPCs for each tenant with Cloud NAT
Why it's wrong here
Peered VPCs for each tenant with Cloud NAT would create multiple VPCs, but this approach lacks centralized management and logging compared to a Shared VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may incorrectly think that VPC peering (Option D) provides the same isolation and centralization as Shared VPC, but peering still requires management of multiple VPCs and does not offer a single point for logging and security policies.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Shared VPC
- Firewall rules
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
Shared VPC
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Review shared VPC, then practise related PCA questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this PCA question test?
Design and plan a cloud solution architecture — This question tests Design and plan a cloud solution architecture — Shared VPC.
What is the correct answer to this question?
The correct answer is: Use a Shared VPC with separate subnets for each tenant and firewall rules to enforce isolation — Option B is correct because using a Shared VPC with separate subnets per tenant and firewall rules to enforce isolation provides centralized network security and logging while keeping tenants isolated. Option A is incorrect because dedicated Cloud VPN connections per tenant do not provide isolation within the VPC and are more for hybrid connectivity. Option C is incorrect because a single VPC with network tags and IAP tunnels does not enforce strict isolation between tenants and relies on tags which can be misconfigured. Option D is incorrect because peered VPCs for each tenant with Cloud NAT would create multiple VPCs but does not provide centralized management and logging as easily as a Shared VPC.
What should I do if I get this PCA question wrong?
Review shared VPC, then practise related PCA questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Shared VPC
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Last reviewed: Jun 24, 2026
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