The correct approach is to create multiple VPN tunnels, each with its own BGP session to a Cloud Router. This design works because a single Cloud VPN gateway can terminate multiple point-to-point tunnels, and each tunnel requires its own BGP session to independently exchange dynamic routes with its corresponding on-premises site. Using one tunnel with multiple BGP sessions is not supported, as each tunnel is a single logical link; static routes would lack the dynamic failover and redundancy needed for multiple sites. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of Cloud VPN’s architecture and the necessity of per-site BGP sessions for route isolation and high availability. A common trap is assuming a single tunnel can handle multiple sites via policy-based routing, but Cloud VPN tunnels are strictly point-to-point. Memory tip: think “one tunnel, one BGP session per site” — like a dedicated highway lane for each on-premises location.
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. 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.
A company needs to connect multiple on-premises sites to Google Cloud using a single Cloud VPN gateway. What is the recommended approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create multiple VPN tunnels, each with its own BGP session to a Cloud Router.
When connecting multiple on-premises sites to Google Cloud using a single Cloud VPNgateway, the recommended approach is to create multiple VPN tunnels, each with its own BGP session to a Cloud Router. This allows the Cloud VPN gateway to terminate multiple tunnels, and each tunnel can have a unique BGP session for dynamic route exchange, enabling the gateway to learn and advertise routes for each site independently. Using a single tunnel with multiple BGP sessions or policy-based routing is not supported because a Cloud VPN tunnel is a point-to-point connection that can only have one BGP session per tunnel, and static routes would not provide the redundancy or dynamic failover needed for multiple sites.
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.
✗
Create a single VPN tunnel and use policy-based routing to direct traffic.
Why it's wrong here
Policy-based routing is not supported for multiple sites over a single tunnel.
✗
Use a single VPN tunnel with multiple BGP sessions.
Why it's wrong here
Only one BGP session per tunnel is allowed; multiple sessions require multiple tunnels.
✓
Create multiple VPN tunnels, each with its own BGP session to a Cloud Router.
Why this is correct
This allows each site to have its own encrypted tunnel and dynamic routing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a single VPN tunnel and use static routes for each site.
Why it's wrong here
Static routes are not recommended for multiple sites due to lack of dynamic failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that a single VPN tunnel can support multiple BGP sessions or that policy-based routing can be used to segregate traffic for multiple sites, but in Google Cloud, each tunnel is a point-to-point construct that requires its own BGP session, and policy-based routing is not available for Cloud VPN.
Detailed technical explanation
How to think about this question
Under the hood, a Cloud VPNgateway is a regional resource that can support up to 64 tunnels per gateway, each tunnel terminating at a different on-premises peer. Each tunnel must have its own BGP session (or static route) because the tunnel is a separate Layer 3 connection with its own IPsec security association and BGP peer IP. In a real-world scenario, if you have three branch offices, you would create three tunnels from the same Cloud VPN gateway to each branch, each with a BGP session to a Cloud Router, allowing the Cloud Router to dynamically exchange routes (e.g., via eBGP with ASN 64512) and automatically handle failover if one branch link goes down.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create multiple VPN tunnels, each with its own BGP session to a Cloud Router. — When connecting multiple on-premises sites to Google Cloud using a single Cloud VPN gateway, the recommended approach is to create multiple VPN tunnels, each with its own BGP session to a Cloud Router. This allows the Cloud VPN gateway to terminate multiple tunnels, and each tunnel can have a unique BGP session for dynamic route exchange, enabling the gateway to learn and advertise routes for each site independently. Using a single tunnel with multiple BGP sessions or policy-based routing is not supported because a Cloud VPN tunnel is a point-to-point connection that can only have one BGP session per tunnel, and static routes would not provide the redundancy or dynamic failover needed for multiple sites.
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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Question Discussion
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