Quick Answer
The answer is Cloud CDN, because it directly addresses the need to reduce latency with cloud CDN by caching content at Google’s globally distributed edge locations, bringing data physically closer to end users. When a user in a distant region requests content, Cloud CDN serves it from the nearest edge cache instead of routing the request all the way back to the single-region Compute Engine backend, dramatically cutting round-trip time and offloading the origin server. On the Google Professional Cloud Developer exam, this scenario tests your understanding of how to optimize global performance for latency-sensitive applications, often appearing in questions that contrast Cloud CDN with other services like Cloud Load Balancing or Cloud Armor. A common trap is choosing a regional load balancer, which distributes traffic but does not cache content at the edge. Remember the mnemonic “CDN = Cache Distributes Near” to recall that edge caching is the key to slashing latency for global users.
This PCD practice question tests your understanding of designing highly scalable, available, and reliable cloud-native applications. 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 company relies on a Compute Engine backend serving content to global users. They notice high latency for users outside the primary region. Which service should they add to reduce latency by caching content at edge locations?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Cloud Armor
Why wrong: Provides WAF and DDoS protection, not caching.
Cloud NAT
Why wrong: Enables outbound internet access for VMs, not relevant.
Cloud CDN
Caches static content globally near users, reducing latency.
Cloud Endpoints
Why wrong: Manages API authentication and quotas, not caching.
Cloud Load Balancing
Why wrong: Distributes traffic but does not cache content.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cloud CDN
Cloud CDN (Content Delivery Network) uses Google's global edge cache locations to serve cached content closer to users, reducing latency for requests that would otherwise travel to the origin Compute Engine backend in a single region. By caching static or dynamic content at edge nodes, Cloud CDN minimizes round-trip time and offloads traffic from the backend instance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Cloud Armor
Why it's wrong here
Provides WAF and DDoS protection, not caching.
Cloud NAT
Why it's wrong here
Enables outbound internet access for VMs, not relevant.
Cloud CDN
Why this is correct
Caches static content globally near users, reducing latency.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Cloud Endpoints
Why it's wrong here
Manages API authentication and quotas, not caching.
Cloud Load Balancing
Why it's wrong here
Distributes traffic but does not cache content.
Common exam traps
Cisco often tests the distinction between load balancing (which distributes traffic but does not cache) and CDN (which caches at edge locations), leading candidates to mistakenly choose Cloud Load Balancing because they associate it with global performance improvements.
Detailed technical explanation
Cloud CDN leverages Google's globally distributed edge points of presence (PoPs) that cache content based on configurable cache keys, TTLs, and invalidation policies. Under the hood, it integrates with HTTP(S) Load Balancing and uses the same anycast IP to route users to the nearest edge cache, which can serve cached responses directly without forwarding to the origin, significantly reducing latency for distant users. In real-world scenarios, a single cache miss still requires a full round trip to the origin, so tuning cache hit ratios and using techniques like cache warming or signed URLs for private content is critical.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Designing highly scalable, available, and reliable cloud-native applications — This question tests Designing highly scalable, available, and reliable cloud-native applications — Read the scenario before looking for a memorised answer..
The correct answer is: Cloud CDN — Cloud CDN (Content Delivery Network) uses Google's global edge cache locations to serve cached content closer to users, reducing latency for requests that would otherwise travel to the origin Compute Engine backend in a single region. By caching static or dynamic content at edge nodes, Cloud CDN minimizes round-trip time and offloads traffic from the backend instance.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This PCD practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCD exam.
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