AZ-204 Develop for Azure storage Practice Question
You are designing a solution to store user-uploaded images. The images are accessed infrequently (a few times per month) and must be available for download within seconds when requested. You need to minimize storage costs while meeting the access requirements. Which Azure Blob Storage access tier should you choose for the container?
⚠ Common exam trap
It's easy for candidates to confuse 'infrequent access' with 'cold storage' and choose Cold or Archive tiers, failing to recognize that 'available within seconds' eliminates any tier requiring rehydration (Archive) or having a 90-day minimum duration (Cold).
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 tier
The Cool tier is optimal because the images are accessed infrequently (a few times per month) but require immediate download within seconds. Cool tier offers lower storage costs than Hot tier while maintaining low-latency access (milliseconds), meeting the access requirement without incurring the higher storage cost of Hot tier.
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 tier
Why it's wrong here
The Hot tier is designed for frequently accessed data, offering the lowest access costs and highest availability. However, it comes with the highest per-GB storage cost among the tiers. For user-uploaded images that are likely accessed infrequently after their initial upload, the Hot tier would result in unnecessarily high storage expenses, making it economically inefficient for this use case.
- ✓
Cool tier
Why this is correct
The Cool tier provides an optimal balance for data that is accessed infrequently, typically a few times per month, while still requiring sub-second latency for retrieval. It offers lower storage costs compared to the Hot tier, with slightly higher access costs. This tier is well-suited for user-uploaded images where immediate availability is expected upon request, but the overall access frequency is not high enough to justify the Hot tier's premium.
- ✗
Cold tier
Why it's wrong here
The Cold tier is optimized for very rarely accessed data, with a recommended access frequency of once every 90 days or less. While it offers significantly lower storage costs than the Hot or Cool tiers, it imposes a 90-day minimum storage duration. If user-uploaded images are accessed or deleted before this period, substantial early-deletion penalties can negate the storage cost savings, making it unsuitable for data with unpredictable access patterns within 90 days.
- ✗
Archive tier
Why it's wrong here
The Archive tier offers the absolute lowest storage cost, making it ideal for long-term retention of data that is rarely, if ever, accessed. However, retrieving data from the Archive tier requires a rehydration process that can take several hours, depending on the priority chosen. This lengthy retrieval time fails to meet the typical requirement for user-facing applications to display images with sub-second or even seconds-level response times, rendering it impractical for interactive image viewing.
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
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