Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. 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 optimize their network costs for inter-region traffic using Cloud VPN. What is the most cost-effective configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a single VPN tunnel with dynamic routing.
Option D is correct because a single VPN tunnel with dynamic routing (BGP) is the most cost-effective configuration for inter-region traffic using Cloud VPN. Cloud VPN charges per tunnel-hour and per GB of data processed, so using a single tunnel minimizes the hourly cost while dynamic routing ensures automatic failover and route advertisement without needing multiple tunnels.
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.
✗
Use partner interconnect.
Why it's wrong here
Partner interconnect is a managed connection, more expensive than VPN.
✗
Use Cloud NAT.
Why it's wrong here
Cloud NAT enables outbound internet access for private instances, not site-to-site connectivity.
✗
Use dedicated interconnect.
Why it's wrong here
Dedicated interconnect provides high bandwidth but at higher cost, not cost-effective for typical inter-region traffic.
✓
Use a single VPN tunnel with dynamic routing.
Why this is correct
VPN tunnels are low-cost and dynamic routing (BGP) provides redundancy and optimal path selection.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that multiple VPN tunnels or dedicated interconnect solutions are required for inter-region traffic, when in fact a single VPN tunnel with dynamic routing is the most cost-effective option for Cloud VPN.
Detailed technical explanation
How to think about this question
Cloud VPN uses IPsec tunnels with BGP for dynamic routing, where each tunnel incurs an hourly cost (e.g., $0.05 per hour per tunnel) and data processing costs ($0.12 per GB for inter-region egress). A single tunnel with BGP can advertise multiple CIDR ranges and handle failover via BGP timers (e.g., keepalive interval of 10 seconds), avoiding the need for multiple tunnels that would double the hourly cost. In real-world scenarios, using a single tunnel with dynamic routing is optimal for low-to-moderate inter-region traffic, while multiple tunnels are only needed for higher availability or throughput requirements.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a single VPN tunnel with dynamic routing. — Option D is correct because a single VPN tunnel with dynamic routing (BGP) is the most cost-effective configuration for inter-region traffic using Cloud VPN. Cloud VPN charges per tunnel-hour and per GB of data processed, so using a single tunnel minimizes the hourly cost while dynamic routing ensures automatic failover and route advertisement without needing multiple tunnels.
What should I do if I get this PCA 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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