The answer is to enable Cloud CDN and configure cache modes for static content. This is correct because Cloud CDN caches static assets at Google’s global edge locations, so when users in Asia request a file, it is served from a nearby point of presence rather than traveling all the way to the us-central1 origin, dramatically reducing latency. On the Google Professional Cloud DevOps Engineer exam, this scenario tests your understanding of how to improve static asset load times in Asia with Cloud CDN, often appearing as a trap where candidates mistakenly suggest moving the origin or increasing instance count instead of leveraging edge caching. The key insight is that Cloud CDN’s distributed cache is purpose-built for geographically distant users, and configuring cache modes—like setting appropriate Cache-Control headers or using origin cache policies—ensures static content is retained at the edge. Remember the mnemonic “Edge, not origin” to recall that the fix is caching at the edge, not relocating the source.
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.
You are using Cloud CDN with an external HTTPS load balancer. Users in Asia report slow load times for static assets. The origin is in us-central1. What should you do to improve performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Cloud CDN and configure cache modes for static content.
Cloud CDN caches static assets at Google's global edge locations, reducing latency for users in Asia by serving content from a nearby point of presence instead of the us-central1 origin. Enabling Cloud CDN and configuring cache modes for static content (e.g., setting Cache-Control headers or using origin cache policies) ensures that frequently requested assets are served from cache, dramatically improving load times for geographically distant users.
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.
✗
Switch the load balancer to an internal HTTPS load balancer with gRPC.
Why it's wrong here
Not applicable for static assets.
✗
Use premium tier networking for the load balancer.
Why it's wrong here
Premium tier improves routing but does not cache.
✓
Enable Cloud CDN and configure cache modes for static content.
Why this is correct
CDN caches content at edge locations, reducing latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a serverless NEG to route traffic to Cloud Functions.
Why it's wrong here
Not relevant for static assets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between network-level optimizations (like premium tier) and application-level caching (like CDN), and the trap here is assuming that faster routing alone can solve latency for repeated static asset requests, when in fact caching eliminates the need for those requests to reach the origin at all.
Detailed technical explanation
How to think about this question
Cloud CDN leverages Google's global edge cache network, which consists of over 150 points of presence worldwide. When a user requests a static asset, the edge cache serves it if the asset is cached and fresh, based on the Cache-Control max-age or s-maxage directives. For assets that are not cacheable or have short TTLs, the edge fetches from the origin but can still serve stale content while revalidating (stale-while-revalidate), which improves perceived performance. In this scenario, the origin in us-central1 means a round-trip time of ~150-200ms to Asia; caching reduces that to near-zero for cached objects.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 Cloud CDN and configure cache modes for static content. — Cloud CDN caches static assets at Google's global edge locations, reducing latency for users in Asia by serving content from a nearby point of presence instead of the us-central1 origin. Enabling Cloud CDN and configuring cache modes for static content (e.g., setting Cache-Control headers or using origin cache policies) ensures that frequently requested assets are served from cache, dramatically improving load times for geographically distant users.
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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