The correct answer is Azure CDN because it is the dedicated content delivery network service designed to cache static content at edge locations worldwide, reducing latency for users by serving cached copies of files like images, CSS, and JavaScript from servers closest to the requestor. This caching offloads traffic from the origin server and accelerates delivery, directly addressing the core purpose of a CDN. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your ability to distinguish Azure CDN from Azure Front Door, which is a common trap—Front Door also caches but is primarily a global load balancer and application delivery controller, not a dedicated CDN. Remember the memory tip: “CDN for static content, Front Door for routing and WAF.”
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which Azure service provides a content delivery network (CDN) that caches static content at edge locations worldwide to reduce latency for users?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure CDN
Azure CDN is the correct answer because it is specifically designed as a content delivery network that caches static content (such as images, CSS, JavaScript files) at edge locations worldwide. By distributing cached copies closer to users, it reduces latency and offloads origin server traffic. Azure Front Door also uses edge caching but is primarily a global load balancer and application delivery controller, not a dedicated CDN service.
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.
✗
Azure Front Door
Why it's wrong here
Azure Front Door includes CDN capabilities but is a broader application delivery service with global load balancing and WAF.
✓
Azure CDN
Why this is correct
Azure CDN is the dedicated content delivery network service that caches static content at global edge locations.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Traffic Manager
Why it's wrong here
Traffic Manager is DNS-based traffic routing across regions — it doesn't cache content at edge locations.
✗
Azure Application Gateway
Why it's wrong here
Application Gateway is a regional layer-7 load balancer — it doesn't provide global edge caching.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Front Door with Azure CDN because both offer edge caching and global presence, but Front Door is primarily a global load balancer with advanced routing and WAF capabilities, while Azure CDN is the dedicated service for static content caching and delivery.
Detailed technical explanation
How to think about this question
Azure CDN leverages a distributed network of point-of-presence (POP) servers across the globe, using rules defined in the CDN profile to determine caching behavior (e.g., cache-control headers, expiration times). Under the hood, it supports multiple origin types (Azure Storage, web apps, or any publicly accessible server) and uses HTTP/HTTPS protocols to fetch and cache content. In a real-world scenario, a global e-commerce site using Azure CDN for product images can see latency drop from 200ms to under 20ms for users in distant regions, as the images are served from the nearest edge node rather than the central origin.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure CDN — Azure CDN is the correct answer because it is specifically designed as a content delivery network that caches static content (such as images, CSS, JavaScript files) at edge locations worldwide. By distributing cached copies closer to users, it reduces latency and offloads origin server traffic. Azure Front Door also uses edge caching but is primarily a global load balancer and application delivery controller, not a dedicated CDN service.
What should I do if I get this AZ-900 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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