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. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 an on-premises data center connected to GCP via Dedicated Interconnect. They run latency-sensitive applications on GCE and use Cloud Storage for backups. The backup traffic is causing congestion on the Interconnect link. How should they optimize costs and performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Route backup traffic through a separate VPN tunnel over the internet to reduce congestion on the Interconnect.
Option D is correct because routing backup traffic over a separate VPN tunnel using the internet offloads non-latency-sensitive backup data from the Dedicated Interconnect link, reducing congestion without incurring additional costs for increased bandwidth. This approach preserves the low-latency path for critical application traffic while using a cost-effective, encrypted internet-based connection for backups, optimizing both performance and cost.
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.
✗
Increase the Dedicated Interconnect bandwidth to accommodate both traffic types.
Why it's wrong here
This increases cost unnecessarily.
✗
Move backup storage to a different region to reduce data transfer costs.
Why it's wrong here
This doesn't address the congestion issue.
✗
Use Cloud Interconnect to connect directly to Cloud Storage for backup traffic.
Why it's wrong here
Cloud Interconnect is for hybrid connectivity, not specifically for storage.
✓
Route backup traffic through a separate VPN tunnel over the internet to reduce congestion on the Interconnect.
Why this is correct
This offloads non-critical traffic, preserving Interconnect performance for latency-sensitive apps.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume all traffic must use the most reliable connection (Dedicated Interconnect) for everything, overlooking that non-critical traffic can be cost-effectively offloaded to a VPN over the internet without violating security or performance requirements.
Detailed technical explanation
How to think about this question
Dedicated Interconnect provides a direct, low-latency connection with an SLA of 99.99% availability, ideal for latency-sensitive workloads. By contrast, a VPN tunnel over the internet uses IPsec (IKEv2 or IKEv1) to encrypt backup traffic, which is less sensitive to latency and jitter, and can be configured with lower-cost internet bandwidth. This separation leverages the fact that Cloud Storage supports resumable uploads and parallel composite uploads, making it tolerant of variable network conditions, while GCE applications benefit from the dedicated path's consistent performance.
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: Route backup traffic through a separate VPN tunnel over the internet to reduce congestion on the Interconnect. — Option D is correct because routing backup traffic over a separate VPN tunnel using the internet offloads non-latency-sensitive backup data from the Dedicated Interconnect link, reducing congestion without incurring additional costs for increased bandwidth. This approach preserves the low-latency path for critical application traffic while using a cost-effective, encrypted internet-based connection for backups, optimizing both performance and cost.
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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