The correct answer is that the custom RBAC role lacks the necessary data plane permission for blob deletion. While the role includes 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete' under Actions, this is a control plane permission that only governs management operations like listing or configuring storage accounts, not the actual data operation of deleting a blob. To delete blobs, the role must specify the corresponding data action 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete/action' under DataActions, which grants direct access to the blob data itself. On the AZ-305 exam, this distinction between Azure RBAC control plane vs data plane permissions for blob deletion is a frequent trap: candidates often assume any permission with "delete" in the name covers the action, but Azure enforces a strict separation. A reliable memory tip is to remember that data actions always end with '/action'—if you don't see that suffix, you're only managing the resource, not using it.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. 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.
Refer to the exhibit. A custom Azure RBAC role is defined as shown. A user assigned this role is unable to delete blobs in a container. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The role does not include delete permission on blobs
Option D is correct because the custom RBAC role definition shown in the exhibit includes 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete' under the 'Actions' section, but this permission is a control plane action, not a data plane action. To delete blobs, the role must include the corresponding data action 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete/action' under 'DataActions'. Without it, the user lacks the necessary data plane permission to perform blob deletion, even though the control plane permission is present.
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.
✗
The role is scoped to the storage account but not to the container
Why it's wrong here
The role can be assigned at any scope; container-level assignment would work.
✗
The role does not include read permission on blobs
Why it's wrong here
Read permission is included in dataActions.
✗
The role does not include any dataActions
Why it's wrong here
DataActions for read and write are present.
✓
The role does not include delete permission on blobs
Why this is correct
Delete action is missing from dataActions.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see 'delete' in the Actions list and assume it covers blob deletion, missing the critical distinction between control plane and data plane permissions in Azure RBAC.
Detailed technical explanation
How to think about this question
Azure RBAC separates control plane (Azure Resource Manager) actions from data plane actions. Control plane actions manage the resource itself (e.g., creating a storage account), while data plane actions operate on data within the resource (e.g., reading or deleting a blob). For blob deletion, the required data action is 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete/action'. This distinction is critical because a role with only control plane delete permission cannot delete the actual blob content; it can only delete the blob resource metadata. In practice, this means a user with 'Contributor' at the storage account scope can delete the storage account but not the blobs inside it without additional dataActions.
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-305 question in full detail.
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The role does not include delete permission on blobs — Option D is correct because the custom RBAC role definition shown in the exhibit includes 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete' under the 'Actions' section, but this permission is a control plane action, not a data plane action. To delete blobs, the role must include the corresponding data action 'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete/action' under 'DataActions'. Without it, the user lacks the necessary data plane permission to perform blob deletion, even though the control plane permission is present.
What should I do if I get this AZ-305 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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