Azure Blob Storage Access Tiers: Hot, Cool, Archive
Which THREE of the following are true about Azure Blob Storage access tiers? (Choose THREE.)
Quick Answer
One true statement in this set is that a blob's access tier isn't fixed at upload time — it can be changed afterward either manually, by setting the tier directly on an existing blob, or automatically, through a lifecycle management policy that moves blobs between tiers based on rules like time since last access. This flexibility exists specifically because access patterns often change over the life of a file: data that starts out frequently accessed and belongs in Hot may go quiet after a few weeks and become cheaper to keep in Cool, then rarely-touched data can eventually move to Archive for the lowest possible storage cost. The other true statements in this question round out the same underlying tradeoff — Archive has the lowest storage cost paired with the highest retrieval cost and latency, since data isn't instantly accessible, and each tier represents a different balance point between what you pay to store data and what you pay to read it. The tier-changing capability is what makes lifecycle management genuinely useful rather than just a manual chore: instead of re-uploading data to change its cost profile, policies can shift it automatically as its access pattern evolves, which is the mechanism these access-tier comparison questions are ultimately testing.
⚠ Common exam trap
Many exam-takers confuse storage cost with access cost, assuming the Hot tier is cheaper overall, or mistakenly believe Archive blobs can be read immediately after tier change, ignoring the 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
✓
You can change the access tier of a blob after it has been uploaded.
Azure Blob Storage allows you to change the access tier of a blob after it has been uploaded, either by directly setting the tier on the blob or using lifecycle management policies. This flexibility enables you to optimize storage costs based on changing access patterns without re-uploading data.
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 has lower storage cost than Cool tier.
Why it's wrong here
Hot tier has higher storage cost than Cool tier.
- ✗
Archive tier allows immediate read access to blobs.
Why it's wrong here
Archive requires rehydration before reading.
- ✓
You can change the access tier of a blob after it has been uploaded.
Why this is correct
Access tier can be changed after upload.
- ✓
Cool tier is suitable for data that is accessed infrequently (30+ days).
Why this is correct
Cool tier is optimized for infrequent access.
- ✓
Archive tier has the lowest storage cost.
Why this is correct
Archive tier has the lowest storage cost but high retrieval cost.
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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Same concept, more angles
1 more way this is tested on AZ-204
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. Which Azure Blob Storage access tier is optimized for infrequently accessed data with a minimum storage duration of 30 days?
easy- A.Transactional
- B.Archive
- C.Premium
- ✓ D.Cool
- E.Hot
Why D: 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.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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