The answer is AWS IAM authentication. This is correct because Amazon S3 is an external cloud storage service that does not support Microsoft Entra ID, SQL Authentication, or Windows Authentication, so Purview’s managed identity must authenticate by assuming an AWS IAM role with read permissions for the S3 bucket. For the Microsoft Azure Data Fundamentals DP-900 exam, this question tests your understanding that Purview can scan cross-cloud sources, but authentication methods must match the source’s native identity system—a common trap is assuming Entra ID works everywhere. Remember that for any non-Azure external source like S3, you rely on the provider’s own IAM; for Azure sources, you use managed identity or SQL auth. A useful memory tip: “S3 needs IAM, not SAML or Entra—think cross-cloud role assumption.”
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Your company is implementing a data governance solution using Microsoft Purview. The data catalog must automatically scan and classify sensitive data in Azure SQL Database, Azure Synapse Analytics, and Amazon S3. The company uses Microsoft Entra ID for identity management. You need to ensure that the Purview managed identity can authenticate to these data sources. Which authentication method should you configure for the Amazon S3 connection?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS IAM authentication
Amazon S3 is an external cloud storage service that does not support Microsoft Entra ID, SQL Authentication, or Windows Authentication. To authenticate Purview's managed identity to S3, you must configure AWS IAM authentication, which allows Purview to assume an IAM role with permissions to read the S3 bucket metadata and data for scanning and classification.
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.
✓
AWS IAM authentication
Why this is correct
Amazon S3 uses AWS IAM for authentication. The Purview managed identity must be granted access via an IAM role.
Related concept
Read the scenario before looking for a memorised answer.
✗
SQL Authentication
Why it's wrong here
SQL Authentication is used for Azure SQL Database and Azure Synapse, not for Amazon S3.
✗
Windows Authentication
Why it's wrong here
Windows Authentication is used for on-premises SQL Server, not for cloud S3.
✗
Microsoft Entra ID authentication
Why it's wrong here
Microsoft Entra ID is used for Azure services, but Amazon S3 requires AWS IAM.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume Microsoft Entra ID authentication works for all data sources because the question mentions Entra ID for identity management, but Amazon S3 is an AWS service that requires AWS IAM, not Microsoft's identity system.
Detailed technical explanation
How to think about this question
When configuring a Purview scan rule for Amazon S3, you must create an IAM role in AWS with a trust policy that allows Purview's managed identity (via its AWS external ID) to assume the role. Purview then uses AWS Signature Version 4 to sign API requests to S3, enabling secure access without storing long-term AWS credentials. This cross-cloud authentication pattern is essential for hybrid data governance scenarios.
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-900 question in full detail.
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS IAM authentication — Amazon S3 is an external cloud storage service that does not support Microsoft Entra ID, SQL Authentication, or Windows Authentication. To authenticate Purview's managed identity to S3, you must configure AWS IAM authentication, which allows Purview to assume an IAM role with permissions to read the S3 bucket metadata and data for scanning and classification.
What should I do if I get this DP-900 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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