AZ-204 Cool access tier Practice Question
Which Azure Blob Storage access tier is optimized for infrequently accessed data with a minimum storage duration of 30 days?
⚠ Common exam trap
Candidates often assume that Archive qualifies because it is for rarely accessed data, but they overlook the 180-day minimum storage duration required by Archive.
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 optimized for infrequently accessed data and has a minimum storage duration of 30 days, matching both requirements. The Archive tier is for infrequently accessed data but requires a minimum storage duration of 180 days, so it does not meet the 30-day requirement. The Hot tier is for frequently accessed data. The Premium tier is for high-performance, frequently accessed data. 'Transactional' is not a standard Azure Blob Storage access tier. Therefore, among the given options, only Cool satisfies all criteria.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Transactional
Why it's wrong here
Transactional is not a Blob Storage access tier at all; the tiers are Hot, Cool, Cold and Archive. It is tempting because transaction volume and access frequency genuinely drive tier selection, but no tier named Transactional exists, so it cannot satisfy the 30-day minimum duration requirement.
- ✗
Archive
Why it's wrong here
Archive enforces a 180-day minimum storage duration, so deleting or rehydrating data before then incurs early-deletion charges; Cool matches the 30-day requirement. Archive is tempting because it also targets infrequently accessed data, but its longer minimum duration and rehydration latency make it wrong here.
- ✗
Premium
Why it's wrong here
Premium is a performance tier for block blobs backed by SSD storage, not an access tier defined by access frequency or minimum duration. It is tempting because Premium sounds like a higher service level, but it addresses latency and throughput requirements rather than the 30-day infrequent-access profile.
- ✓
Cool
Why this is correct
Cool tier targets infrequently accessed data and enforces a 30-day minimum storage duration, unlike Hot (no minimum) and Archive (180 days). It satisfies the stem's constraint by matching low-access frequency with lower storage cost while retaining immediate availability.
- ✗
Hot
Why it's wrong here
Hot suits frequently accessed data with no minimum duration, so it bills at the highest storage rate and cannot meet the 30-day infrequent-access requirement. It is tempting because Hot is the default tier, but Cool is the tier designed for infrequently accessed data held at least 30 days.
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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