PCDOE Optimizing service performance Practice Question
This PCDOE practice question tests your understanding of optimizing service performance. 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 is transferring large datasets from on-premises to Google Cloud using a VPN. They notice high latency due to packet loss. What is the most effective way to improve throughput?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up Dedicated Interconnect for a more reliable connection.
Dedicated Interconnect provides a direct, private physical connection between on-premises and Google Cloud, bypassing the public internet entirely. This eliminates the packet loss and high latency inherent in VPN tunnels over the internet, offering consistent throughput and lower latency for large dataset transfers.
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.
✓
Set up Dedicated Interconnect for a more reliable connection.
Why this is correct
Dedicated Interconnect provides a direct physical connection, reducing packet loss and latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable compression on the VPN tunnel.
Why it's wrong here
Compression reduces size but does not address packet loss issues.
✗
Increase the number of VPN tunnels and use BGP multipath.
Why it's wrong here
Multiple tunnels add redundancy but not necessarily better reliability if the network path is lossy.
✗
Use a multi-region GCP endpoint and distribute traffic.
Why it's wrong here
Multi-region endpoints do not fix packet loss on the VPN.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that adding more VPN tunnels or enabling compression can overcome internet-based packet loss, but the correct solution is to eliminate the unreliable public internet path entirely with a dedicated connection like Interconnect.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses IEEE 802.1Q VLAN tagging and supports speeds from 10 Gbps to 100 Gbps per circuit, with a Service Level Agreement (SLA) of 99.99% availability. It relies on a direct peering arrangement with Google's edge network, bypassing internet transit, which eliminates issues like jitter, packet reordering, and loss that plague TCP-based transfers over VPNs. In real-world scenarios, large dataset transfers (e.g., multi-terabyte database migrations) over VPN can experience TCP window scaling issues and retransmission timeouts due to even 0.1% packet loss, drastically reducing throughput; Dedicated Interconnect provides a clean, low-latency path that allows TCP to operate at full efficiency.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Optimizing service performance — This question tests Optimizing service performance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up Dedicated Interconnect for a more reliable connection. — Dedicated Interconnect provides a direct, private physical connection between on-premises and Google Cloud, bypassing the public internet entirely. This eliminates the packet loss and high latency inherent in VPN tunnels over the internet, offering consistent throughput and lower latency for large dataset transfers.
What should I do if I get this PCDOE 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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