The answer is that enabling Cloud CDN reduces latency by serving content from edge locations. This is correct because Cloud CDN caches static content at Google’s globally distributed edge points of presence, which are geographically closer to end users than the origin HTTP load balancer. By delivering cached data from these nearby edge nodes instead of routing every request back to the origin, the data travels a much shorter network path, dramatically cutting round-trip time and improving page load speeds. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of how CDN architecture directly addresses latency reduction, often appearing in questions that contrast edge caching with origin pull or that ask about the primary benefit of offloading traffic from the load balancer. A common trap is confusing latency reduction with bandwidth savings or security features—remember that the core benefit is distance reduction, not throughput. Memory tip: think “edge = shorter road, faster load.”
PCNE Configuring network services Practice Question
This PCNE practice question tests your understanding of configuring network services. 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.
An e-commerce website uses Cloud CDN to cache static content. The origin is an external HTTP load balancer. What is the benefit of enabling Cloud CDN in this scenario?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It reduces latency by serving content from edge locations.
Cloud CDN caches content at Google's global edge locations, which are geographically closer to end users. By serving static content from these edge caches instead of the origin HTTPload balancer, the request latency is significantly reduced because the data travels a shorter distance over the network.
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.
✗
It eliminates the need for SSL certificates.
Why it's wrong here
SSL is still needed between CDN and clients, and between CDN and origin.
✗
It provides DDoS protection only.
Why it's wrong here
Cloud CDN provides some DDoS protection, but the main benefit is latency reduction; Cloud Armor is for advanced DDoS protection.
✗
It increases compute instance capacity.
Why it's wrong here
Cloud CDN does not increase compute capacity; it offloads requests from origin.
✓
It reduces latency by serving content from edge locations.
Why this is correct
Content is cached at edges closer to users, reducing round-trip time.
Related concept
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 CDN replaces security features like SSL or DDoS protection, but the trap here is that candidates confuse caching benefits with infrastructure scaling or security capabilities.
Detailed technical explanation
How to think about this question
Cloud CDN leverages Google's global network of over 150 edge points of presence (PoPs) to cache responses based on cache keys and TTL headers (Cache-Control, Expires). When a cache miss occurs, the edge fetches from the origin via the HTTPload balancer, and the response is then cached for subsequent requests. In a real-world scenario, a flash sale with static product images can be served entirely from edge caches, preventing origin overload and ensuring fast load times worldwide.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
Configuring network services — This question tests Configuring network services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It reduces latency by serving content from edge locations. — Cloud CDN caches content at Google's global edge locations, which are geographically closer to end users. By serving static content from these edge caches instead of the origin HTTP load balancer, the request latency is significantly reduced because the data travels a shorter distance over the network.
What should I do if I get this PCNE 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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