The correct answer is to generate a shared access signature (SAS) with write-only permission and an expiry time. This method provides the highest security for SAS for secure upload to Blob Storage because it delegates time-limited, granular access to a specific container without exposing the storage account key. A write-only SAS ensures the external partner can upload JSON files containing sensitive financial data but cannot read, modify, or list existing blobs, while the expiry automatically revokes access after a set period, minimizing risk. On the Microsoft Azure Data Engineer Associate DP-203 exam, this scenario tests your understanding of delegated access vs. account keys or anonymous access—a common trap is choosing a full SAS or container-level permission, which would violate the principle of least privilege. Remember the mnemonic “WET” for secure uploads: Write-only, Expiry, and Time-bound.
DP-203 Design and implement data storage Practice Question
This DP-203 practice question tests your understanding of design and implement data storage. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 need to store JSON files from an external partner in Azure Blob Storage. The files contain sensitive financial data. Which access method provides the highest security while allowing the partner to upload files?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Generate a shared access signature (SAS) with write-only permission and expiry time
Option C is correct because a Shared Access Signature (SAS) with write-only permission and an expiry time provides delegated, time-limited access to Azure Blob Storage without exposing the storage account key. This ensures the partner can upload JSON files but cannot read, modify, or list existing blobs, and access automatically revokes after the expiry, meeting the highest security requirement for sensitive financial 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.
✗
Share the storage account access key with the partner
Why it's wrong here
C is wrong because access key grants full control over the account.
✗
Configure a firewall to allow only the partner's IP address
Why it's wrong here
D is wrong because IP-based access does not authenticate the partner identity.
✓
Generate a shared access signature (SAS) with write-only permission and expiry time
Why this is correct
B is correct because SAS provides scoped, time-limited access.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable anonymous public access to a container
Why it's wrong here
A is wrong because public access exposes data to anyone.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse IP-based firewalls (Option B) as a security method, but firewalls do not authenticate users or control data-plane permissions, and they can be bypassed if the partner's IP changes or if the partner uses a shared network.
Detailed technical explanation
How to think about this question
A SAS token is generated using the storage account key and includes parameters such as signed permissions (e.g., 'w' for write), signed expiry (e.g., ISO 8601 UTC), and signed resource (e.g., 'c' for container). The token is appended to the blob endpoint URL, and Azure Storage validates the signature using HMAC-SHA256. In a real-world scenario, you can also restrict the SAS to a specific IP range or require HTTPS to further harden access for external partners.
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 DP-203 question in full detail.
Design and implement data storage — This question tests Design and implement data storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Generate a shared access signature (SAS) with write-only permission and expiry time — Option C is correct because a Shared Access Signature (SAS) with write-only permission and an expiry time provides delegated, time-limited access to Azure Blob Storage without exposing the storage account key. This ensures the partner can upload JSON files but cannot read, modify, or list existing blobs, and access automatically revokes after the expiry, meeting the highest security requirement for sensitive financial data.
What should I do if I get this DP-203 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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