Quick Answer
The answer is the Storage Blob Data Reader role. This built-in RBAC role is the correct choice because it grants read-only permissions specifically for Azure Storage blob containers and their data, including Azure Data Lake Storage Gen2, without allowing any write, modify, or delete operations. On the Microsoft Azure Data Fundamentals DP-900 exam, this question tests your understanding of how Azure RBAC roles map to specific data plane operations, often appearing in scenarios where you need to distinguish between read-only and read-write access for different job functions. A common trap is confusing the Storage Blob Data Reader with the Storage Blob Data Contributor, which includes write and delete permissions, or with the generic Reader role, which only provides read access to the storage account’s management plane, not the data itself. Remember the mnemonic: “Reader reads data, Contributor creates content” to quickly differentiate these two key roles during the exam.
This DP-900 practice question tests your understanding of describe an analytics workload on azure. 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.
Your company uses Azure Data Lake Storage Gen2 and wants to grant a data scientist read-only access to a specific container. Which built-in RBAC role should you assign?
Storage Account Contributor
Why wrong: This role manages the storage account, not the data.
Reader
Why wrong: Reader does not include data plane permissions.
Storage Blob Data Contributor
Why wrong: This role allows write access, which is not needed.
Storage Blob Data Reader
This role grants read-only access to blob containers and data.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Storage Blob Data Reader
Storage Blob Data Reader (D) is the correct built-in RBAC role because it grants read-only access to Azure Storage blob containers and data, including Data Lake Storage Gen2. This role provides the necessary permissions for a data scientist to read data from a specific container without allowing write or delete operations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Storage Account Contributor
Why it's wrong here
This role manages the storage account, not the data.
Reader
Why it's wrong here
Reader does not include data plane permissions.
Storage Blob Data Contributor
Why it's wrong here
This role allows write access, which is not needed.
Storage Blob Data Reader
Why this is correct
This role grants read-only access to blob containers and data.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the ARM-level Reader role (which only allows viewing storage account metadata) with data plane roles like Storage Blob Data Reader, mistakenly thinking Reader grants data access.
Detailed technical explanation
Azure RBAC roles for Blob Storage are separate from ARM roles; Storage Blob Data Reader uses the 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/read' action to authorize data plane operations via the Azure Blob Storage REST API or SDK. In Data Lake Storage Gen2, this role also enables reading files and directories through the hierarchical namespace, but does not allow ACL modifications or write operations. A real-world scenario is a data scientist needing to query Parquet files in a container using Azure Synapse or Databricks without risking accidental data modification.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Describe an analytics workload on Azure — This question tests Describe an analytics workload on Azure — Read the scenario before looking for a memorised answer..
The correct answer is: Storage Blob Data Reader — Storage Blob Data Reader (D) is the correct built-in RBAC role because it grants read-only access to Azure Storage blob containers and data, including Data Lake Storage Gen2. This role provides the necessary permissions for a data scientist to read data from a specific container without allowing write or delete operations.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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