The correct answer is Azure CDN, as it is the dedicated Microsoft service designed to cache static content at edge locations close to users. Azure CDN works by storing copies of files like images, CSS, and JavaScript on strategically placed Points of Presence (PoPs) around the globe, so when a user requests content, it is served from the nearest edge node rather than the origin server. This dramatically reduces latency and offloads traffic from the backend, directly fulfilling the requirement for faster delivery of static assets. On the AZ-900 exam, this question tests your understanding of core content delivery and networking services, often appearing alongside other global infrastructure options like Azure Front Door or Traffic Manager. A common trap is confusing Azure CDN with Azure Front Door—remember that CDN focuses purely on caching static content at the edge, while Front Door adds global load balancing and application acceleration. For a quick memory tip, think “CDN = Cache at the Nearest node.”
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) to cache static content at edge locations close to 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 (Content Delivery Network) is the dedicated Azure service designed to cache static content—such as images, CSS, JavaScript files, and videos—at strategically placed edge nodes (Points of Presence, or PoPs) around the world. By serving content from the edge location closest to the user, Azure CDN reduces latency, offloads origin server traffic, and improves load times for global audiences. This directly matches the question's requirement for a service that caches static content at edge locations.
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 Traffic Manager
Why it's wrong here
Traffic Manager provides DNS-based load balancing, not content caching at edge nodes.
✗
Azure Front Door
Why it's wrong here
Front Door provides global HTTPload balancing and caching, but Azure CDN is the dedicated CDN service.
✓
Azure CDN
Why this is correct
Azure CDN caches static content at global edge locations to reduce latency for end users.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Front Door (which also provides edge caching) with Azure CDN, but Front Door is primarily an application delivery controller with global load balancing and WAF, whereas Azure CDN is the dedicated, purpose-built service for static content caching at edge locations.
Detailed technical explanation
How to think about this question
Azure CDN operates by replicating cached content across a global network of edge servers (PoPs) that can number in the hundreds, using either Microsoft's own global network or partner networks like Akamai or Verizon. When a user requests a resource, the CDN intercepts the request via DNS resolution and serves the cached copy from the nearest PoP if it is fresh; otherwise, it fetches the content from the origin server (e.g., Azure Storage, Azure App Service, or an external web server) and caches it for subsequent requests. A subtle but important behavior is that Azure CDN supports both HTTP and HTTPS caching, and cache expiration is controlled by Cache-Control headers (e.g., max-age) or custom rules, which can be configured via rules engine or caching policies.
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 (Content Delivery Network) is the dedicated Azure service designed to cache static content—such as images, CSS, JavaScript files, and videos—at strategically placed edge nodes (Points of Presence, or PoPs) around the world. By serving content from the edge location closest to the user, Azure CDN reduces latency, offloads origin server traffic, and improves load times for global audiences. This directly matches the question's requirement for a service that caches static content at edge locations.
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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