AZ-104 Implement and Manage Storage Practice Question
A data-processing app reads blobs immediately after upload, and operations do not want any rehydration delay. Which three access tiers can be read directly? Select three.
⚠ Common exam trap
Test-takers frequently confuse the Cold tier with the Archive tier, assuming Cold also requires rehydration, or they mistakenly think the Premium tier is an access tier like Hot/Cool/Cold, when in fact it is a performance tier for premium block blob accounts and not a blob-level access tier.
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
✓
Hot
The Hot, Cool, and Cold access tiers are designed for online data access, meaning blobs stored in these tiers can be read immediately without any rehydration delay. This is because the data is always stored on high-throughput, low-latency media and is immediately available for read operations. In contrast, the Archive tier requires a rehydration process (which can take hours) before data can be accessed, making it unsuitable for scenarios where blobs must be read immediately after upload.
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 this is correct
Hot is an online access tier optimized for frequent read and write operations. Blobs in Hot remain immediately accessible after upload, because no rehydration or lifecycle transition is needed before data is served. This makes Hot a safe default answer, though the scenario does not require optimizing for the lowest cost.
- ✓
Cool
Why this is correct
Cool is also an online tier designed for data that is infrequently accessed but still needs low latency. Because Cool blobs stay fully mounted to the storage service, applications can issue read requests seconds after upload without triggering a restore operation. The higher per-access charge is irrelevant to the requirement because no rehydration delay exists.
- ✓
Cold
Why this is correct
The Cold access tier is a suitable choice because it provides immediate access to data without requiring any rehydration. This directly satisfies the scenario's critical constraint that operations do not want any rehydration delay when reading blobs immediately after upload. Although Cold offers lower storage costs than Hot or Cool, it maintains the necessary direct readability, ensuring data is available instantly.
- ✗
Archive
Why it's wrong here
Archive places blobs in an offline state that requires an explicit rehydration step before the data can be read. This rehydration can take minutes to several hours, depending on the selected priority, which directly violates the constraint that reads happen immediately after upload. Therefore Archive is wrong even though it offers the lowest storage price.
When this WOULD be correct
If the question asked 'Which tier is used for long-term backup with lowest storage cost, accepting rehydration delay?' then Archive would be correct.
- ✗
Premium
Why it's wrong here
Premium is not a blob access tier but a performance tier for storage accounts built on SSD hardware for low latency and high transaction rates. It still relies on the same access tiers (Hot, Cool, Archive) to govern replays and rehydration behavior, so it does not by itself ensure immediate readability. Choosing Premium would answer a performance question, not this access-tier question.
When this WOULD be correct
This option would be correct in a question about selecting a storage tier for a high-performance application requiring low latency and high throughput, such as a database or real-time analytics workload, where the Premium tier (premium block blob storage) is the appropriate choice.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓HotCorrect answer▾
Why this is correct
Hot is an online access tier optimized for frequent read and write operations. Blobs in Hot remain immediately accessible after upload, because no rehydration or lifecycle transition is needed before data is served. This makes Hot a safe default answer, though the scenario does not require optimizing for the lowest cost.
✗ArchiveWrong answer — click to see why▾
Why this is wrong here
Archive tier requires rehydration (up to 15 hours) to read blobs, which contradicts the requirement for no rehydration delay.
★ When this WOULD be the correct answer
If the question asked 'Which tier is used for long-term backup with lowest storage cost, accepting rehydration delay?' then Archive would be correct.
Why candidates choose this
Candidates may think Archive is directly readable because it's a storage tier, but they overlook the rehydration requirement for read access.
✗PremiumWrong answer — click to see why▾
Why this is wrong here
Premium tier is not a general-purpose access tier for blob storage; it is a performance tier for Azure Files or for premium block blob storage, which does not support direct read access in the same way as Hot, Cool, or Cold tiers. The question asks for access tiers that can be read directly without rehydration, and Premium is not one of the three standard access tiers (Hot, Cool, Cold) that offer immediate read access.
★ When this WOULD be the correct answer
This option would be correct in a question about selecting a storage tier for a high-performance application requiring low latency and high throughput, such as a database or real-time analytics workload, where the Premium tier (premium block blob storage) is the appropriate choice.
Why candidates choose this
Candidates may confuse Premium with a high-performance access tier that also allows immediate reads, or they may think that because Premium offers better performance, it must be one of the tiers that can be read directly, overlooking that the question specifically refers to the three standard access tiers (Hot, Cool, Cold) that are designed for direct read access without rehydration.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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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