The answer is Classic VPN with route-based configuration because it provides a simple VPN without dynamic routing, perfectly matching a classic VPN setup for a single-subnet on-premises network that lacks BGP support. Route-based VPNs rely on static routes in the routing table to forward traffic, eliminating the need for dynamic routing protocols while keeping costs low compared to HA VPN. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of when to choose Classic VPN over HA VPN and when route-based is preferable to policy-based—a common trap is assuming policy-based is simpler, but route-based actually requires less configuration for static environments. Remember the memory tip: “No BGP, no problem—route-based classic keeps it simple.”
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. 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. 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 wants to connect an on-premises network to Google Cloud using Cloud VPN. The on-premises network has a single subnet and no dynamic routing capabilities. The company needs a simple, low-cost solution. Which VPN configuration should they choose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Classic VPN with route-based configuration
Classic VPN with route-based configuration is the correct choice because the on-premises network lacks dynamic routing capabilities and requires a simple, low-cost solution. Route-based VPNs use static routes and do not require BGP, making them ideal for environments without dynamic routing support. Classic VPN is the legacy, lower-cost option compared to HA VPN, and route-based configuration allows traffic to be forwarded based on routing table entries rather than policy-based selectors.
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.
✓
Classic VPN with route-based configuration
Why this is correct
Classic VPN route-based supports static routing without BGP, ideal for simple setups.
Related concept
Read the scenario before looking for a memorised answer.
✗
HA VPN with dynamic routing (BGP)
Why it's wrong here
HA VPN requires BGP and dynamic routing, which the on-premises network does not support.
✗
HA VPN with static routing
Why it's wrong here
HA VPN does not support static routing; it requires BGP.
✗
Classic VPN with policy-based configuration
Why it's wrong here
Policy-based requires traffic selectors and is more complex, not ideal for simple single subnet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that HA VPN is always superior, but the trap here is that HA VPN is unnecessary and more expensive for a simple, single-subnet network without dynamic routing, leading candidates to overlook the simpler Classic VPN option.
Detailed technical explanation
How to think about this question
Route-based VPNs in Google Cloud use a virtual tunnel interface (VTI) and forward traffic based on the routing table, meaning any traffic matching a static route is encrypted and sent through the tunnel. This contrasts with policy-based VPNs, which require explicit traffic selectors (e.g., source 10.0.0.0/24, destination 192.168.0.0/24) and can lead to fragmentation or misconfiguration when subnets change. Classic VPN supports up to 3 Gbps per tunnel and is billed per tunnel-hour, making it cost-effective for simple setups, whereas HA VPN uses two tunnels (active/active) and requires at least two external IP addresses.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: Classic VPN with route-based configuration — Classic VPN with route-based configuration is the correct choice because the on-premises network lacks dynamic routing capabilities and requires a simple, low-cost solution. Route-based VPNs use static routes and do not require BGP, making them ideal for environments without dynamic routing support. Classic VPN is the legacy, lower-cost option compared to HA VPN, and route-based configuration allows traffic to be forwarded based on routing table entries rather than policy-based selectors.
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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