AZ-204 Develop for Azure storage Practice Question
You are building a web application that allows users to upload profile pictures. The images are up to 5 MB in size and must be stored durably. The images are accessed infrequently after upload (a few times per month). You want to minimize storage costs while ensuring the data is available within seconds when requested. Which Azure Blob Storage access tier should you use for the blob container?
⚠ Common exam trap
Many candidates choose Archive tier thinking it is the cheapest option, overlooking the critical requirement that data must be available within seconds, which Archive cannot provide due to its mandatory rehydration latency.
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
✓
Cool
The Cool tier is the optimal choice because the images are accessed infrequently (a few times per month) and are up to 5 MB in size. Cool tier offers lower storage cost than Hot tier while still providing sub-second latency for data retrieval, meeting the requirement of availability within seconds. Archive tier would have the lowest storage cost but incurs a multi-hour rehydration delay, violating the seconds-level availability requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Hot
Why it's wrong here
The Hot tier is optimized for frequently accessed data, offering the lowest access costs but the highest storage costs among the online tiers. While profile pictures need immediate availability, they are typically accessed only when a user's profile is viewed, which is not frequent enough to justify the premium storage price of the Hot tier, making it less cost-effective for this use case.
- ✓
Cool
Why this is correct
The Cool tier is ideal for data that is accessed infrequently, perhaps a few times per month, but still requires immediate availability with low latency. Profile pictures fit this description perfectly, as they are not constantly accessed but must load instantly when requested. This tier offers a cost-effective balance with lower storage costs than Hot and no retrieval delays, making it suitable for user-uploaded content.
- ✗
Archive
Why it's wrong here
The Archive tier offers the absolute lowest storage costs, making it suitable for long-term backups or historical data that is rarely accessed. However, retrieving data from the Archive tier requires a 'rehydration' process that can take several hours, incurring additional retrieval costs. This significant delay makes it entirely unsuitable for profile pictures, which users expect to view instantly upon visiting a profile.
- ✗
Premium
Why it's wrong here
The Premium tier is designed for high-performance block blobs and page blobs, leveraging solid-state drives (SSDs) for extremely low latency and high transaction rates. This tier is significantly more expensive than Hot, Cool, or Archive, and is typically reserved for mission-critical applications requiring consistent, sub-millisecond response times. For standard user profile pictures, which are not high-performance workloads, the Premium tier is an unnecessary and excessively costly option.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.