- A
Block blobs with Hot tier and a lifecycle rule to move to Cool after 7 days.
Why wrong: Block blobs require creating new blocks for each append, which is inefficient for frequent small appends; Cool after 7 days is not the cheapest long-term option.
- B
Append blobs with Hot tier and a lifecycle rule to move to Archive after 7 days.
Append blobs are ideal for append-heavy workloads, Hot tier optimizes write performance, and Archive provides the lowest cost for compliance data not accessed frequently.
- C
Page blobs with Premium tier.
Why wrong: Page blobs are for VHDs and random read/write patterns, not append; Premium tier is expensive and not needed for this scenario.
- D
Append blobs with Cool tier and no lifecycle rule.
Why wrong: Cool tier has lower storage but higher write costs; without lifecycle, data remains in Cool tier, which is more expensive than Archive for long-term retention.
Quick Answer
The answer is Append blobs with the Hot tier and a lifecycle rule to move to Archive after 7 days. This combination minimizes write costs because Append blobs are specifically optimized for append operations, allowing you to continuously add small sensor readings without rewriting or modifying existing data, which avoids the higher transaction costs of Block blobs. For storage cost efficiency, a lifecycle management policy automatically transitions the blobs from the Hot tier to the Archive tier after 7 days, leveraging Archive’s lowest-cost storage for compliance data that is rarely accessed. On the AZ-204 exam, this scenario tests your understanding of blob type selection for logging patterns and lifecycle management for cost optimization—a common trap is choosing Block blobs for appending data, which incurs unnecessary overhead. Remember the mnemonic: “Append for append, Archive for archive” to pair the right blob type with the right tier for logging and archival workflows.
AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. 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.
You design an application that writes millions of small sensor readings (each ~100 bytes) to Azure Blob Storage. The data is appended to files every minute and after 7 days it is archived for compliance. You need to minimize write costs and storage costs. Which blob type and tier strategy should you 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.
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
Append blobs with Hot tier and a lifecycle rule to move to Archive after 7 days.
Append blobs are optimized for append operations, making them ideal for continuously adding small sensor readings without rewriting existing data, which minimizes write costs. Moving the blobs to the Archive tier after 7 days via a lifecycle rule reduces storage costs for compliance data, as Archive is the lowest-cost tier for infrequently accessed data.
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.
- ✗
Block blobs with Hot tier and a lifecycle rule to move to Cool after 7 days.
Why it's wrong here
Block blobs require creating new blocks for each append, which is inefficient for frequent small appends; Cool after 7 days is not the cheapest long-term option.
- ✓
Append blobs with Hot tier and a lifecycle rule to move to Archive after 7 days.
Why this is correct
Append blobs are ideal for append-heavy workloads, Hot tier optimizes write performance, and Archive provides the lowest cost for compliance data not accessed frequently.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Page blobs with Premium tier.
Why it's wrong here
Page blobs are for VHDs and random read/write patterns, not append; Premium tier is expensive and not needed for this scenario.
- ✗
Append blobs with Cool tier and no lifecycle rule.
Why it's wrong here
Cool tier has lower storage but higher write costs; without lifecycle, data remains in Cool tier, which is more expensive than Archive for long-term retention.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose block blobs (Option A) assuming they are the default for all data, overlooking the append blob's specific optimization for append operations and the cost benefits of Archive tier for compliance data.
Trap categories for this question
Scenario analysis trap
Page blobs are for VHDs and random read/write patterns, not append; Premium tier is expensive and not needed for this scenario.
Detailed technical explanation
How to think about this question
Append blobs use a specialized append block operation that adds data to the end of the blob without modifying existing blocks, ensuring atomicity and low latency for high-frequency writes. The Archive tier has a 180-day minimum storage duration for early deletion charges, but lifecycle rules can transition blobs after 7 days if the data remains in Archive for the required period. In real-world IoT scenarios, this pattern reduces costs by up to 80% compared to block blobs for append-heavy workloads.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Develop for Azure storage — study guide chapter
Learn the concepts, then practise the questions
- →
Develop for Azure storage practice questions
Targeted practice on this topic area only
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All AZ-204 questions
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Microsoft Azure Developer Associate AZ-204 study guide
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AZ-204 practice test guide
How to use practice tests most effectively before exam day
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Append blobs with Hot tier and a lifecycle rule to move to Archive after 7 days. — Append blobs are optimized for append operations, making them ideal for continuously adding small sensor readings without rewriting existing data, which minimizes write costs. Moving the blobs to the Archive tier after 7 days via a lifecycle rule reduces storage costs for compliance data, as Archive is the lowest-cost tier for infrequently accessed data.
What should I do if I get this AZ-204 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". 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways 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. An application writes millions of small log entries (500 bytes each) daily. The logs are rarely read, and when read, they are accessed sequentially. You need to minimize storage costs and maximize write throughput. Which Azure Blob Storage type should you use?
medium- A.Block Blob
- B.Page Blob
- ✓ C.Append Blob
- D.Archive Blob
Why C: Append Blob is optimized for append operations, making it ideal for logging scenarios where new data is continuously added to the end of the blob. It provides high write throughput for small, sequential writes (like 500-byte log entries) and lower storage costs compared to Block Blob for this pattern, as it avoids the overhead of managing multiple blocks per append. Additionally, Append Blob supports sequential read access efficiently, matching the rare, sequential read requirement.
Last reviewed: Jun 11, 2026
This AZ-204 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-204 exam.
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