The answer is Microsoft Entra ID pass-through authentication, because it directly maps the caller’s identity to the serverless SQL pool query, ensuring that Azure RBAC permissions on the Azure Data Lake Storage Gen2 account are evaluated per query. This method avoids static credentials like storage account keys or shared access signatures, instead relying on the user’s existing Entra ID token to enforce fine-grained access control on Parquet files. On the DP-203 exam, this scenario tests your understanding of how serverless SQL pools differ from dedicated pools—the key trap is choosing a credential-based option (like a SAS token or managed identity) when the requirement explicitly states “identity of the caller.” Remember that pass-through is synonymous with “impersonation” in this context: the query runs as you, not as a service. A helpful memory tip is “pass-through = pass the user through to ADLS Gen2,” which reinforces that RBAC roles like Storage Blob Data Reader are checked in real time, not cached.
DP-203 Develop data processing Practice Question
This DP-203 practice question tests your understanding of develop data processing. 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 data processing solution in Azure Synapse Analytics. The solution must use a serverless SQL pool to query Parquet files stored in Azure Data Lake Storage Gen2. Which authentication method should you use to ensure that the queries use the identity of the caller and adhere to Azure role-based access control (RBAC) permissions?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Entra ID pass-through authentication.
Microsoft Entra ID pass-through authentication (option A) is correct because it allows the serverless SQL pool to use the caller's identity when accessing Azure Data Lake Storage Gen2. This ensures that Azure RBAC permissions (e.g., Storage Blob Data Reader) assigned to the user are evaluated for each query, providing fine-grained access control without exposing storage account keys or tokens.
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.
✓
Microsoft Entra ID pass-through authentication.
Why this is correct
Microsoft Entra ID pass-through uses the caller's identity and enforces RBAC permissions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Storage account key.
Why it's wrong here
Storage account keys provide full access and do not support granular permissions.
✗
Shared access signature (SAS) token.
Why it's wrong here
SAS tokens are static and do not enforce per-user RBAC permissions.
✗
Service principal with a secret.
Why it's wrong here
Service principal does not represent the caller's identity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'service principal' (a fixed identity) with 'user identity' and select option D, not realizing that pass-through authentication is the only method that preserves the caller's individual RBAC permissions.
Detailed technical explanation
How to think about this question
Under the hood, serverless SQL pool uses the OAuth 2.0 token exchange flow: when a user runs a query, the pool requests an access token from Microsoft Entra ID on behalf of the user, then presents that token to Azure Data Lake Storage Gen2. This means the storage service sees the user's identity, not the SQL pool's, enabling row-level security or audit trails tied to the caller. In real-world scenarios, this is critical for multi-tenant environments where each analyst must only see data they are explicitly granted via RBAC.
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.
Develop data processing — This question tests Develop data processing — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Entra ID pass-through authentication. — Microsoft Entra ID pass-through authentication (option A) is correct because it allows the serverless SQL pool to use the caller's identity when accessing Azure Data Lake Storage Gen2. This ensures that Azure RBAC permissions (e.g., Storage Blob Data Reader) assigned to the user are evaluated for each query, providing fine-grained access control without exposing storage account keys or tokens.
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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