CV0-004 Cloud Architecture and Design Practice Question
A company is deploying a global web application and wants to reduce latency for users around the world. The application serves static content (images, CSS) and dynamic API responses. Which combination of services should the architect use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CDN for static content and a global load balancer with latency-based routing for dynamic content
CDN caches static content at edge locations, reducing latency. For dynamic content, a global load balancer with latency-based routing directs users to the closest region. DNS alone cannot reduce latency for dynamic content. A single load balancer does not provide global distribution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CDN for static content and a global load balancer with latency-based routing for dynamic content
Why this is correct
A CDN caches static assets at edge locations, cutting latency for images and CSS. Dynamic API responses cannot be cached, so a global load balancer with latency-based routing directs each user to the nearest healthy regional endpoint, satisfying the worldwide latency constraint.
- ✗
CDN for all content without backend routing
Why it's wrong here
A CDN caches static assets at edge locations but cannot generate dynamic API responses, so serving everything through it leaves the backend requirement unmet. It is tempting because CDNs genuinely solve global static-content latency, and would be the right choice for an image- or CSS-only workload with no dynamic endpoints.
- ✗
A single load balancer in one region with a CDN
Why it's wrong here
A single-region load balancer still routes every dynamic API request back to that one region, so global users incur the same round-trip latency. The CDN only caches static assets at edge locations. This suits a single-region application with static content, not one needing multi-region dynamic API processing.
- ✗
DNS round-robin for both static and dynamic content
Why it's wrong here
DNS round-robin only rotates address records; it offers no caching or edge termination, so static assets and API responses still travel from origin servers, leaving global latency unaddressed. It suits crude load spreading across equivalent origin servers in one region. The scenario needs a CDN for static content plus a globally distributed endpoint for dynamic APIs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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