- A
Cloud Interconnect
Why wrong: For on-premises connectivity, not VPC-to-VPC.
- B
VPC Network Peering hub-and-spoke topology
Central VPC peers with all other VPCs, enabling transitive routing.
- C
Shared VPC
Why wrong: Requires all projects to be in the same organization.
- D
VPC Network Peering
Allows direct peering between any two VPCs, cross-organization.
- E
Cloud VPN with dynamic routing
Why wrong: VPN is for on-premises connectivity, not VPC-to-VPC.
Question 225 of 1,000
mediumMultiple SelectObjective-mapped
How to Connect VPC Networks in Different Organizations
This PCNE practice question tests your understanding of pcne exam topics. 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 needs to connect three VPC networks in separate projects (two in the same organization, one in a different organization) to each other for private IP communication. Which TWO GCP solutions should they consider? (Choose 2.)
Quick Answer
The answer is VPC Network Peering, specifically using a hub-and-spoke topology. This is correct because when you need to connect VPC networks across different organizations, VPC peering does not support transitive routing—meaning you cannot simply peer all three VPCs in a mesh and expect traffic to flow between spokes. Instead, a hub-and-spoke design allows a central hub VPC to peer explicitly with each spoke VPC, enabling private IP communication between all three networks even when one belongs to a separate organization. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of VPC peering limitations and the necessity of hub-and-spoke architectures for cross-organization connectivity. A common trap is assuming that peering all VPCs directly will work, but remember: VPC peering is non-transitive, so you must route through a hub. Memory tip: “Hub-and-spoke for cross-org poke”—the hub is the only way to make peering transitive across organizations.
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
✓
VPC Network Peering hub-and-spoke topology
Both options B and D are correct. VPC Network Peering (D) directly connects two VPCs, including across organizations, allowing private IP communication. Option B (hub-and-spoke topology) is a design pattern where a central hub VPC peers with multiple spoke VPCs. While VPC peering is non-transitive, so spokes cannot communicate through the hub alone, the hub-and-spoke model simplifies management of multiple peering connections and can be extended with additional peering between spokes if needed. For this scenario, using VPC peering in a hub-and-spoke layout is a recommended approach to connect VPCs from different organizations, as Shared VPC is limited to a single organization and Cloud Interconnect/VPN are not required for private connectivity when peering is possible.
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.
- ✗
Cloud Interconnect
Why it's wrong here
For on-premises connectivity, not VPC-to-VPC.
- ✓
VPC Network Peering hub-and-spoke topology
Why this is correct
Central VPC peers with all other VPCs, enabling transitive routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Shared VPC
Why it's wrong here
Requires all projects to be in the same organization.
- ✓
VPC Network Peering
Why this is correct
Allows direct peering between any two VPCs, cross-organization.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud VPN with dynamic routing
Why it's wrong here
VPN is for on-premises connectivity, not VPC-to-VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse VPC Network Peering with Shared VPC, assuming Shared VPC can span organizations, but Shared VPC is strictly limited to projects within the same organization, while VPC peering can cross organizations.
Detailed technical explanation
How to think about this question
VPC Network Peering uses the private Google Cloud backbone to route traffic between VPCs without requiring VPN tunnels or gateways, supporting up to 25 peering connections per VPC. In a hub-and-spoke topology, the hub VPC must be explicitly peered with each spoke, and traffic between spokes traverses the hub, but this does not enable transitive peering by default—each spoke must have routes pointing to the hub for inter-spoke communication. A real-world scenario is a multi-organization merger where each org retains its own project but needs private connectivity; a hub VPC in a shared project can peer with all org VPCs, avoiding public internet exposure.
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.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PCNE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: VPC Network Peering hub-and-spoke topology — Both options B and D are correct. VPC Network Peering (D) directly connects two VPCs, including across organizations, allowing private IP communication. Option B (hub-and-spoke topology) is a design pattern where a central hub VPC peers with multiple spoke VPCs. While VPC peering is non-transitive, so spokes cannot communicate through the hub alone, the hub-and-spoke model simplifies management of multiple peering connections and can be extended with additional peering between spokes if needed. For this scenario, using VPC peering in a hub-and-spoke layout is a recommended approach to connect VPCs from different organizations, as Shared VPC is limited to a single organization and Cloud Interconnect/VPN are not required for private connectivity when peering is possible.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
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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