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 are developing a .NET Core application that uploads large files (up to 50 GB) to Azure Blob Storage. The application must support resuming uploads that are interrupted due to network failures. Which approach should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a block blob and upload blocks in parallel, then commit the block list.
Block blobs are designed for large files and support uploading blocks in parallel, which improves throughput and reliability. By uploading individual blocks and then committing the block list, you can resume an interrupted upload by re-uploading only the missing blocks, as each block is identified by a unique block ID. This approach is ideal for files up to 50 GB and aligns with Azure's recommended pattern for resumable uploads.
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.
✗
Use an append blob and append blocks in sequence.
Why it's wrong here
Append blobs are optimized for append operations, not for resumable uploads of large files.
✓
Use a block blob and upload blocks in parallel, then commit the block list.
Why this is correct
Block blobs support block-level operations, allowing resumable uploads by re-uploading only failed blocks.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the Put Blob API to upload the entire file in a single request.
Why it's wrong here
Put Blob has a maximum size of 256 MB for block blobs, insufficient for 50 GB files.
✗
Use a page blob and upload pages in sequence.
Why it's wrong here
Page blobs are designed for random read/write operations, not for resumable uploads of large files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the misconception that append blobs are suitable for large file uploads because they support appending, but the trap is that append blobs lack the block-level granularity needed for resumable uploads, unlike block blobs which are explicitly designed for this scenario.
Detailed technical explanation
How to think about this question
Under the hood, block blobs allow you to upload blocks (up to 100 MB each) using the Put Block operation, each with a base64-encoded block ID. After uploading, you commit the block list via Put Block List, which atomically assembles the blob. For resumability, you can track which blocks were successfully uploaded (e.g., by storing block IDs in a local database) and re-upload only the missing ones. Azure Storage SDKs also provide the `BlobUploadOptions` with `TransferOptions` that enable automatic retry and parallel uploads, leveraging the block blob architecture.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
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: Use a block blob and upload blocks in parallel, then commit the block list. — Block blobs are designed for large files and support uploading blocks in parallel, which improves throughput and reliability. By uploading individual blocks and then committing the block list, you can resume an interrupted upload by re-uploading only the missing blocks, as each block is identified by a unique block ID. This approach is ideal for files up to 50 GB and aligns with Azure's recommended pattern for resumable uploads.
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.
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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