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.
Which TWO actions should a DevOps engineer take to reduce latency for a global user base accessing a web application hosted on Compute Engine?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure instance groups in multiple regions with a global load balancer.
Option A is correct because deploying instance groups in multiple regions and using a global load balancer (e.g., Google Cloud External HTTP(S) Load Balancer) allows user requests to be routed to the closest healthy backend, reducing network round-trip time. This geo-distribution minimizes latency by serving content from the nearest regional endpoint rather than a single centralized location.
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.
✓
Configure instance groups in multiple regions with a global load balancer.
Why this is correct
Multi-region deployment allows serving users from the closest region, reducing latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable HTTP/2 on the load balancer.
Why it's wrong here
HTTP/2 improves connection efficiency but does not significantly reduce global latency.
✓
Enable Cloud CDN with cache static content.
Why this is correct
Cloud CDN caches static content at edge locations, reducing latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the machine type of the instances.
Why it's wrong here
Larger machines improve throughput but do not reduce geographic latency.
✗
Use Cloud Load Balancing with global anycast IP.
Why it's wrong here
Global LB already uses anycast; this alone does not reduce origin latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that a global anycast IP alone (Option E) is sufficient to reduce latency, but the trap is that anycast only optimizes the frontend routing to the edge; without multi-region backends, the request must still travel to the single backend region, negating the latency benefit.
Detailed technical explanation
How to think about this question
Google Cloud's global external HTTP(S) load balancer uses a global anycast IP and a distributed proxy infrastructure to terminate connections at the edge, then routes requests to the closest healthy backend via Google's backbone network. When combined with multi-region instance groups, the load balancer can direct traffic to a regional backend that is geographically near the user, dramatically reducing round-trip time (RTT) compared to a single-region deployment. This architecture is essential for latency-sensitive applications like real-time collaboration tools or gaming, where even 50ms of additional latency can degrade user experience.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: Configure instance groups in multiple regions with a global load balancer. — Option A is correct because deploying instance groups in multiple regions and using a global load balancer (e.g., Google Cloud External HTTP(S) Load Balancer) allows user requests to be routed to the closest healthy backend, reducing network round-trip time. This geo-distribution minimizes latency by serving content from the nearest regional endpoint rather than a single centralized location.
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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