PCDOE Optimizing service performance Practice Question
This PCDOE practice question tests your understanding of optimizing service performance. 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 latency-sensitive web application uses Cloud CDN. What configuration change would most directly reduce cache miss rates?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable cache static content and set appropriate cache modes
Enabling cache static content and setting appropriate cache modes directly reduces cache miss rates by ensuring that more requests are served from the Cloud CDN cache rather than forwarded to the origin. This configuration allows the CDN to store and serve static assets (e.g., images, CSS, JavaScript) based on cache keys and TTLs, minimizing the number of cache misses for eligible content.
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.
✗
Enable Cloud Armor to filter malicious traffic
Why it's wrong here
Cloud Armor provides DDoS protection, not cache optimization.
✗
Use signed URLs to restrict access
Why it's wrong here
Signed URLs control access but do not affect cache hit ratio.
✗
Set TTL to 0 to ensure content is always fresh
Why it's wrong here
TTL=0 forces revalidation on every request, increasing misses and origin load.
✓
Enable cache static content and set appropriate cache modes
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 reducing TTL or using security features like signed URLs improves cache performance, when in fact these actions either increase cache misses or have no effect on caching behavior.
Detailed technical explanation
How to think about this question
Cloud CDN uses cache modes like 'FORCE_CACHE_ALL' or 'USE_ORIGIN_HEADERS' to control what content is cached and for how long. By enabling cache static content, the CDN applies default caching rules (e.g., caching based on file extension or MIME type) and respects cache-control headers from the origin, which reduces misses by ensuring static assets are stored at edge locations. In practice, misconfigured cache modes (e.g., 'BYPASS_CACHE') or overly short TTLs can lead to high miss rates, especially for content that changes infrequently.
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: Enable cache static content and set appropriate cache modes — Enabling cache static content and setting appropriate cache modes directly reduces cache miss rates by ensuring that more requests are served from the Cloud CDN cache rather than forwarded to the origin. This configuration allows the CDN to store and serve static assets (e.g., images, CSS, JavaScript) based on cache keys and TTLs, minimizing the number of cache misses for eligible content.
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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