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.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Why wrong: Hot tier has the highest storage cost and is designed for frequent access, not cost-effective for monthly access.
B
Cool tier
Cool tier balances lower storage cost with immediate access, ideal for data accessed less than 30 days apart.
C
Cold tier
Why wrong: Cold tier has the lowest storage cost but higher access costs, best for data accessed very rarely (90+ days); for monthly access, Cool is more cost-effective.
D
Archive tier
Why wrong: Archive tier has the lowest storage cost but requires manual rehydration (taking hours) before data can be read, not suitable for immediate access.
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 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.
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.
✗
Hot tier
Why it's wrong here
Hot tier has the highest storage cost and is designed for frequent access, not cost-effective for monthly access.
✓
Cool tier
Why this is correct
Cool tier balances lower storage cost with immediate access, ideal for data accessed less than 30 days apart.
Clue confirmation
The clue words "minimum / minimize", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cold tier
Why it's wrong here
Cold tier has the lowest storage cost but higher access costs, best for data accessed very rarely (90+ days); for monthly access, Cool is more cost-effective.
✗
Archive tier
Why it's wrong here
Archive tier has the lowest storage cost but requires manual rehydration (taking hours) before data can be read, not suitable for immediate access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Archive tier for infrequent access without realizing that the multi-hour rehydration latency makes it impossible to meet the 'within seconds' availability requirement, or they choose Hot tier out of habit for any access speed requirement, ignoring the cost-minimization goal.
Detailed technical explanation
How to think about this question
Azure Blob Storage access tiers are designed with different storage and access costs: Hot has the highest storage cost but no access cost, Cool has lower storage cost with a $0.01/GB read cost and 30-day minimum storage duration, Cold has even lower storage cost with a $0.02/GB read cost and 90-day minimum, and Archive has the lowest storage cost but requires a rehydration operation (Blob Batch or Set Blob Tier) that can take 1-15 hours depending on priority. The Cool tier's 30-day minimum storage duration aligns perfectly with monthly access patterns, avoiding early deletion penalties that would apply to Cold or Archive tiers.
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: Cool tier — 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.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize", "immediately / without restart". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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