- A
Upgrade to Premium Block Blob storage.
Why wrong: Provides consistent low latency but is expensive and does not provide global edge caching.
- B
Enable Azure CDN or Azure Front Door with caching rules.
Caches content at edge locations globally, reducing latency.
- C
Enable read-access geo-redundant storage (RA-GRS).
Why wrong: Provides secondary read endpoint but only in one other region, not global edge caching.
- D
Use Azure Front Door with private link to the storage account.
Combines global load balancing, caching, and secure private access.
- E
Use Blob Storage lifecycle management to delete blobs after reading.
Why wrong: Does not reduce latency; deletion is for cost management.
Question 81 of 997
Reduce Latency for Blob Images using CDN and Front Door
This AZ-204 practice question tests your understanding of develop for azure storage. 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.
A healthcare application stores patient diagnostic images in Azure Blob Storage. The images are accessed by radiologists worldwide. You need to reduce latency for image retrieval while maintaining security and compliance. Which TWO actions should you take?
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
✓
Enable Azure CDN or Azure Front Door with caching rules.
Option B is correct because Azure CDN or Azure Front Door caches frequently accessed images at edge locations closer to radiologists worldwide, reducing latency for image retrieval. Caching rules allow you to control cache duration and behavior while maintaining security through integration with Azure's authentication and authorization mechanisms.
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.
- ✗
Upgrade to Premium Block Blob storage.
Why it's wrong here
Provides consistent low latency but is expensive and does not provide global edge caching.
- ✓
Enable Azure CDN or Azure Front Door with caching rules.
Why this is correct
Caches content at edge locations globally, reducing latency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable read-access geo-redundant storage (RA-GRS).
Why it's wrong here
Provides secondary read endpoint but only in one other region, not global edge caching.
- ✓
Use Azure Front Door with private link to the storage account.
Why this is correct
Combines global load balancing, caching, and secure private access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Blob Storage lifecycle management to delete blobs after reading.
Why it's wrong here
Does not reduce latency; deletion is for cost management.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse high-availability features like RA-GRS with performance optimization, or assume that private link alone reduces latency, when in fact caching at edge locations is the key mechanism for global latency reduction.
Detailed technical explanation
How to think about this question
Azure Front Door uses Anycast routing to direct users to the nearest point of presence (PoP), and with caching rules, it stores blob responses at the edge based on Cache-Control headers or default expiration. Under the hood, Front Door's private link integration (option D) secures traffic by routing it through the Microsoft backbone network, but it does not inherently reduce latency unless combined with caching; the primary latency reduction comes from edge caching, not private connectivity.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Develop for Azure storage — study guide chapter
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Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable Azure CDN or Azure Front Door with caching rules. — Option B is correct because Azure CDN or Azure Front Door caches frequently accessed images at edge locations closer to radiologists worldwide, reducing latency for image retrieval. Caching rules allow you to control cache duration and behavior while maintaining security through integration with Azure's authentication and authorization mechanisms.
What should I do if I get this AZ-204 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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