The correct answer is that VPC peering does not support transitive peering, which is a fundamental limitation compared to Shared VPC. This means that if VPC A is peered with VPC B, and VPC A is also peered with VPC C, traffic from VPC B cannot route through VPC A to reach VPC C—each peering connection is a direct, one-to-one link with no routing propagation across multiple hops. On the Google Professional Cloud Security Engineer exam, this concept tests your understanding of network topology constraints and isolation models; a common trap is assuming that peering behaves like a router, allowing indirect connectivity. Shared VPC, by contrast, uses a single host project to centrally manage subnets, enabling all attached service projects to communicate without this transitive restriction. Memory tip: think of VPC peering as a direct phone line between two houses—you cannot call a third house by dialing through the first.
PCSE Configuring network security Practice Question
This PCSE practice question tests your understanding of configuring network security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 VPC networks that need to communicate privately. They are evaluating VPC peering and Shared VPC. Which statement correctly describes a limitation of VPC peering compared to Shared VPC?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VPC peering does not support transitive peering
VPC peering does not support transitive peering, meaning if networks A and B are peered, and A and C are peered, B cannot communicate with C through A. Shared VPC does not have this limitation.
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.
✗
VPC peering cannot route traffic to an on-premises network via VPN
Why it's wrong here
VPC peering can exchange custom routes including VPN routes.
✗
VPC peering does not support firewall rules
Why it's wrong here
Each network maintains its own firewall rules; peering does not affect that.
✓
VPC peering does not support transitive peering
Why this is correct
This is a key limitation. Shared VPC allows all projects in the same host project to communicate directly.
Related concept
Read the scenario before looking for a memorised answer.
✗
VPC peering requires all networks to be in the same project
Why it's wrong here
VPC peering can connect networks across different projects.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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.
What to study next
Got this wrong? Here's your next step.
Identify which PCSE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Configuring network security — This question tests Configuring network security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: VPC peering does not support transitive peering — VPC peering does not support transitive peering, meaning if networks A and B are peered, and A and C are peered, B cannot communicate with C through A. Shared VPC does not have this limitation.
What should I do if I get this PCSE question wrong?
Identify which PCSE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This PCSE 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 PCSE exam.
Question Discussion
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