The answer is that the archive access tier has the lowest storage costs but the highest retrieval latency, while the cool access tier offers lower storage costs than hot but higher access costs. This is correct because Azure Blob Storage access tiers are built on a fundamental cost trade-off: as storage costs decrease from hot to cool to archive, the costs to read or write data increase, and retrieval latency grows dramatically—archive data can take hours to rehydrate. On the Microsoft Azure Solutions Architect Expert AZ-305 exam, this concept tests your ability to align tier selection with data lifecycle patterns, often appearing in scenario-based questions about cost optimization for long-term retention. A common trap is assuming cool tier has the lowest storage costs, forgetting that archive is the cheapest for storage but requires a rehydration step. Remember the memory tip: “Hot for hits, Cool for cuts, Archive for archives”—the hotter the tier, the faster and pricier the storage; the colder the tier, the cheaper to store but costlier and slower to access.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are true about Azure Blob Storage access tiers?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The cool access tier has lower storage costs but higher access costs compared to the hot tier
Option A is correct because Azure Blob Storage's cool access tier is designed for infrequently accessed data, offering lower storage costs than the hot tier but higher access costs (per GB read/write) to compensate for the reduced storage price. This cost trade-off aligns with typical usage patterns where data is stored long-term but accessed less often.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The cool access tier has lower storage costs but higher access costs compared to the hot tier
Why this is correct
Correct: cool is cheaper to store, more expensive to access.
Related concept
Read the scenario before looking for a memorised answer.
✗
The cool access tier is designed for data that is accessed more frequently than the hot tier
Why it's wrong here
Cool is for infrequent access.
✗
The archive access tier is suitable for data that is accessed daily
Why it's wrong here
Archive is for rarely accessed data (e.g., yearly).
✓
The archive access tier has the lowest storage costs but the highest retrieval latency
Why this is correct
Correct: archive is cheapest but retrieval takes hours.
Related concept
Read the scenario before looking for a memorised answer.
✗
The hot access tier has the lowest storage costs
Why it's wrong here
Hot has the highest storage costs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing the cost trade-off between storage and access—candidates often assume 'cool' means cheaper overall, but they miss that access costs are higher, and they mistakenly think archive supports daily access due to its low storage cost.
Detailed technical explanation
How to think about this question
Under the hood, Azure Blob Storage access tiers are enforced at the blob level via the `x-ms-access-tier` header, and data in the archive tier must be rehydrated to hot or cool (a process taking up to 15 hours) before reading. In a real-world scenario, a company storing compliance logs for 7 years would use cool for the first 90 days and archive thereafter, balancing cost and retrieval time.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The cool access tier has lower storage costs but higher access costs compared to the hot tier — Option A is correct because Azure Blob Storage's cool access tier is designed for infrequently accessed data, offering lower storage costs than the hot tier but higher access costs (per GB read/write) to compensate for the reduced storage price. This cost trade-off aligns with typical usage patterns where data is stored long-term but accessed less often.
What should I do if I get this AZ-305 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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. A media company stores large video files that are accessed once a month for audits. When needed, they must be available for download immediately (within seconds). The company wants to minimize storage costs. Which Azure Blob Storage access tier should they use?
medium
A.Hot tier
✓ B.Cool tier
C.Cold tier
D.Archive tier
Why B: The Cool tier is optimal for this scenario because it balances low storage cost with high availability and low latency access. Video files accessed once a month for audits require immediate download (within seconds), which Cool tier supports with the same millisecond latency as Hot tier, but at a lower storage price. Archive tier would introduce a multi-hour rehydration delay, making it unsuitable for on-demand access within seconds.
Last reviewed: Jun 24, 2026
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This AZ-305 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-305 exam.
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