The correct action is to change the storage account access keys. This works because every Shared Access Signature (SAS) token is cryptographically signed using either the storage account key or a user delegation key; by rotating the account key, you invalidate the signature of every SAS token that was generated with the old key, immediately revoking access to all blobs for every user, including the specific user in question. On the Microsoft Azure Data Fundamentals DP-900 exam, this scenario tests your understanding of SAS token dependencies and the difference between revoking individual tokens versus invalidating all tokens at once—a common trap is to overthink user-specific solutions when a global key rotation is the simplest and most immediate fix. Remember the memory tip: “Rotate the key, revoke the fleet”—changing the account key is like changing the master lock, which instantly renders every old key copy useless.
DP-900 Practice Question: Describe considerations for working with non-relational data on Azure
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data 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.
A company stores user profile images in Azure Blob Storage. Each image is accessed via a URL that includes a Shared Access Signature (SAS) token generated using the storage account key. The company needs to immediately revoke access to all images for a specific user. Which action should they take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the storage account access keys.
Option B is correct because changing the storage account access keys invalidates all SAS tokens that were generated using those keys, including any existing tokens. This immediately revokes access to all images for all users, including the specific user, without needing to manage individual tokens. SAS tokens are signed with the account key, so rotating the key renders all tokens generated with the old key invalid.
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.
✗
Delete the individual SAS tokens associated with that user's images.
Why it's wrong here
SAS tokens are not stored by Azure; they are generated client-side. There is no way to delete individual tokens.
✓
Change the storage account access keys.
Why this is correct
All SAS tokens that were generated using the account key are invalidated when the key is changed or regenerated, instantly revoking access.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete the container containing the user's images.
Why it's wrong here
This would remove all images, not just for one user, and may affect other users.
✗
Regenerate the SAS token for each image.
Why it's wrong here
Regenerating tokens does not invalidate existing tokens, so the old tokens would still grant access until they expire.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates think SAS tokens can be individually deleted or regenerated, but Azure does not maintain a token registry; the only way to invalidate all tokens derived from an account key is to rotate the key itself.
Detailed technical explanation
How to think about this question
A SAS token is a URI that grants restricted access rights to storage resources, and it is signed using either the storage account key (for account-level SAS) or a user delegation key. When the storage account key is changed, all SAS tokens signed with the old key become invalid because the signature verification fails. This is a common security practice for emergency revocation, similar to rotating a secret in a key management system.
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 considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the storage account access keys. — Option B is correct because changing the storage account access keys invalidates all SAS tokens that were generated using those keys, including any existing tokens. This immediately revokes access to all images for all users, including the specific user, without needing to manage individual tokens. SAS tokens are signed with the account key, so rotating the key renders all tokens generated with the old key invalid.
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.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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