AZ-900 Describe Azure architecture and services Practice Question
Which Azure service provides distributed, low-latency access to large files (like game assets or software packages) for global users?
⚠ Common exam trap
Test-takers frequently confuse Azure CDN with Azure Front Door, assuming both are interchangeable for static content delivery, but Front Door is designed for global load balancing and application acceleration with HTTP routing, while CDN is purpose-built for caching and distributing large static files at the edge.
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
✓
Azure CDN with Blob Storage origin
Azure CDN (Content Delivery Network) with a Blob Storage origin is the correct choice because it caches large files like game assets or software packages at edge nodes distributed globally, providing low-latency access to users. Blob Storage alone offers scalable storage but lacks the distributed caching and geographic proximity that CDN provides, which is essential for reducing latency for global users.
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 Blob Storage alone
Why it's wrong here
Azure Blob Storage alone can host static files with public access, but all requests are served from the storage account's designated region, forcing distant users to traverse the entire network. Without a CDN, there is no edge caching, so large downloads travel long distances, increasing latency and risking throttling. This makes it inadequate for global low-latency access to large files, though it is the raw storage service on which a CDN origin depends.
- ✓
Azure CDN with Blob Storage origin
Why this is correct
Azure CDN with a Blob Storage origin is the standard solution because the CDN caches large files on edge nodes spread across the globe, so users retrieve the file from the nearest point of presence, minimizing latency and jitter. This pattern automatically handles high download volumes, reduces egress costs for the storage account, and integrates seamlessly with Blob Storage for static content. It is the intended Azure service for achieving fast, reliable, worldwide delivery of large files.
- ✗
Azure Front Door
Why it's wrong here
Azure Front Door is a global application delivery controller that routes and accelerates dynamic web application traffic, offering load balancing, WAF, and session affinity, but it is not a content delivery network for static blob downloads. While it can cache a limited set of static assets, it is designed to forward requests to application backends and its caching behavior is less pervasive than Azure CDN's dedicated edge file caching. For distributing very large files from Blob Storage, Front Door adds unnecessary complexity and cost compared to the standard Azure CDN pattern.
- ✗
Azure Files
Why it's wrong here
Azure Files is a managed network file share service that provides SMB and NFS protocols for internal applications, not a mechanism for delivering public content over HTTPS. It does not cache data at worldwide edge locations and is not designed to serve as an origin for large static file downloads to end users. Using Azure Files for content delivery would require building custom infrastructure and still not match the performance or simplicity of a CDN, making it the wrong choice for this scenario.
Go deeper
Related to this question
Learn chapter
Azure Regions and Geographies
Key term
Blob
A blob is a large piece of unstructured data, like a photo or video, stored in the cloud with a unique identifier.
Key term
Blob storage
Blob storage is a cloud service for storing large amounts of unstructured data, such as text or binary data, like documents, images, and videos.
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