The correct combination is Azure Blob Storage with Azure Content Delivery Network (CDN). This pairing works because Blob Storage efficiently stores large, unstructured video files, while Azure CDN caches that content at edge nodes worldwide, serving users from the nearest point of presence to dramatically reduce latency and minimize egress costs by offloading traffic from the origin. On the AZ-305 exam, this scenario tests your understanding of designing a cost-optimized, globally distributed media solution—a common trap is choosing Azure Files or premium storage for throughput, but those lack the global caching and egress savings of CDN. Remember the key principle: for global media streaming, always pair a scalable object store with a CDN to shift traffic to the edge. A useful mnemonic is “Blob for the job, CDN for the win.”
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. 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.
You need to design a storage solution for a large-scale media streaming application. The application serves video files to users worldwide. The solution must minimize latency for end-users and optimize content delivery costs. Which Azure service combination should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Blob Storage with Azure Content Delivery Network (CDN)
Azure Blob Storage is optimized for storing large, unstructured data like video files, and when paired with Azure Content Delivery Network (CDN), it caches content at edge nodes worldwide. This combination minimizes latency for global users by serving videos from the nearest point of presence (PoP) and reduces egress costs by offloading traffic from the origin storage to the CDN's distributed network.
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 Cosmos DB with multi-region writes
Why it's wrong here
Cosmos DB is a database, not designed for storing large video files.
✗
Azure NetApp Files with Azure Front Door
Why it's wrong here
NetApp Files is for high-performance file workloads, not cost-effective for large-scale media.
✓
Azure Blob Storage with Azure Content Delivery Network (CDN)
Why this is correct
Blob Storage stores videos; CDN caches at edge locations for low latency and cost efficiency.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Files with Azure File Sync
Why it's wrong here
Azure Files is for file sharing, not optimized for streaming media delivery.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Front Door (a global load balancer with HTTP caching) with a full CDN, but for static video content, Azure CDN (or Azure Front Door's CDN profile) is the correct service because it provides dedicated edge caching and egress cost optimization, whereas Front Door's primary role is application acceleration and routing.
Detailed technical explanation
How to think about this question
Azure CDN (now part of Azure Front Door Standard/Premium) uses anycast routing and edge caching to serve content from over 190 PoPs globally, reducing round-trip time (RTT) for users. Blob Storage supports features like static website hosting and lifecycle management, but for streaming, you often configure CDN caching rules with a TTL of hours or days to maximize cache hits and minimize origin requests. In real-world scenarios, you might also use Azure Media Services for encoding and packaging, but the core storage+CDN pair is the baseline for cost-effective, low-latency delivery.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Blob Storage with Azure Content Delivery Network (CDN) — Azure Blob Storage is optimized for storing large, unstructured data like video files, and when paired with Azure Content Delivery Network (CDN), it caches content at edge nodes worldwide. This combination minimizes latency for global users by serving videos from the nearest point of presence (PoP) and reduces egress costs by offloading traffic from the origin storage to the CDN's distributed network.
What should I do if I get this AZ-305 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You need to design a storage solution for a website that hosts static content (HTML, CSS, JavaScript) and requires low-cost, scalable storage with integrated CDN delivery. Which Azure service should you use?
easy
A.Azure Files with SMB protocol
B.Azure Content Delivery Network only
✓ C.Azure Blob Storage with static website hosting and Azure CDN
D.Azure App Service
Why C: Azure Blob Storage with static website hosting provides a cost-effective, scalable storage solution for static content (HTML, CSS, JavaScript). By enabling Azure CDN on top of the storage account, you achieve low-latency global content delivery and offload traffic from the origin, reducing costs and improving performance for end users.
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Question Discussion
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