- A
Use the storage account access key.
The storage account access key is a valid authentication method, providing full access to the account. It is commonly used for administrative tasks or when fine-grained control is not required.
- B
Use an OAuth2 token obtained from Microsoft Entra ID for a user.
An OAuth2 token obtained from Microsoft Entra ID for a user identity is a supported authentication method for Azure Blob Storage. It enables role-based access and is ideal for user-facing applications.
- C
Use a shared access signature (SAS) token.
A shared access signature (SAS) token is a valid method for granting delegated access to Blob Storage resources with controlled permissions and expiry. It is useful for providing time-limited access.
- D
Use a client certificate.
Why wrong: Client certificates are not a supported authentication method for Azure Blob Storage. They can be used for device authentication or to authenticate to Azure AD as a service principal, but not directly for Blob Storage access.
- E
Use a managed identity assigned to an Azure resource.
A managed identity assigned to an Azure resource (e.g., a virtual machine or App Service) is a valid authentication method for Azure Blob Storage. It allows secure authentication without storing credentials.
AZ-204 Develop for Azure storage Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. 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.
Which THREE are valid ways to authenticate to Azure Blob Storage from an application? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use the storage account access key.
Option A is correct because the storage account access key provides full administrative access to the storage account, including Blob Storage. It is a simple, shared-key authentication method using HMAC-SHA256 to sign requests. Option B is correct because OAuth2 tokens obtained from Microsoft Entra ID for a user are a supported authentication method for Azure Blob Storage, enabling fine-grained access control. Option C is correct because a shared access signature (SAS) token provides delegated access to storage resources with specified permissions and expiry. Option E is correct because a managed identity assigned to an Azure resource (e.g., a VM or App Service) can be used to authenticate to Blob Storage without storing credentials. Option D is incorrect because client certificates are not a supported authentication method for direct access to Azure Blob Storage; they are used for device authentication or authenticating to Azure AD as a service principal.
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.
- ✓
Use the storage account access key.
Why this is correct
The storage account access key is a valid authentication method, providing full access to the account. It is commonly used for administrative tasks or when fine-grained control is not required.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use an OAuth2 token obtained from Microsoft Entra ID for a user.
Why this is correct
An OAuth2 token obtained from Microsoft Entra ID for a user identity is a supported authentication method for Azure Blob Storage. It enables role-based access and is ideal for user-facing applications.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use a shared access signature (SAS) token.
Why this is correct
A shared access signature (SAS) token is a valid method for granting delegated access to Blob Storage resources with controlled permissions and expiry. It is useful for providing time-limited access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a client certificate.
Why it's wrong here
Client certificates are not a supported authentication method for Azure Blob Storage. They can be used for device authentication or to authenticate to Azure AD as a service principal, but not directly for Blob Storage access.
- ✓
Use a managed identity assigned to an Azure resource.
Why this is correct
A managed identity assigned to an Azure resource (e.g., a virtual machine or App Service) is a valid authentication method for Azure Blob Storage. It allows secure authentication without storing credentials.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Common mistake: Candidates often assume that only one of OAuth2 user token (B) and managed identity (E) is valid, but both are supported methods. Also, client certificates (D) are not directly supported for Blob Storage authentication.
Detailed technical explanation
How to think about this question
Azure Blob Storage authentication relies on three primary mechanisms: shared key (access key), shared access signatures (SAS), and Azure AD OAuth2 tokens (including managed identities). The access key is a 512-bit base64-encoded key used to compute an HMAC-SHA256 signature for each request. SAS tokens allow granular, time-limited access without exposing the account key. Managed identities use Azure AD tokens automatically managed by Azure, eliminating credential storage in code.
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.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Develop for Azure storage — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the storage account access key. — Option A is correct because the storage account access key provides full administrative access to the storage account, including Blob Storage. It is a simple, shared-key authentication method using HMAC-SHA256 to sign requests. Option B is correct because OAuth2 tokens obtained from Microsoft Entra ID for a user are a supported authentication method for Azure Blob Storage, enabling fine-grained access control. Option C is correct because a shared access signature (SAS) token provides delegated access to storage resources with specified permissions and expiry. Option E is correct because a managed identity assigned to an Azure resource (e.g., a VM or App Service) can be used to authenticate to Blob Storage without storing credentials. Option D is incorrect because client certificates are not a supported authentication method for direct access to Azure Blob Storage; they are used for device authentication or authenticating to Azure AD as a service principal.
What should I do if I get this AZ-204 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.
About these practice questions
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Last reviewed: Jun 24, 2026
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