The answer is to use a managed identity assigned to an Azure resource, along with a shared access signature (SAS) and the storage account access key. These three valid authentication methods for Azure Blob Storage each serve distinct security models: managed identity leverages Azure AD for passwordless, role-based access without storing credentials; a SAS token grants time-limited, delegated access with fine-grained permissions; and the account key provides full administrative control via HMAC-SHA256 signed requests. On the AZ-204 exam, this question tests your understanding of identity-based versus key-based authentication, often appearing as a trap where candidates mistakenly select Azure AD user credentials alone—remember that while Azure AD is used, it must be paired with a managed identity or service principal for application access. A useful memory tip is “MAS”: Managed identity, Access key, SAS—three distinct ways to authenticate, each with a different scope of control.
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 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, and is commonly used for development or scenarios where fine-grained access control is not required.
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
Access key is a shared key authentication method.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an OAuth2 token obtained from Microsoft Entra ID for a user.
Why it's wrong here
User tokens are not directly used; managed identities use service principals.
✓
Use a shared access signature (SAS) token.
Why this is correct
SAS tokens provide delegated access.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a client certificate.
Why it's wrong here
Certificates are not supported for Blob Storage authentication.
✓
Use a managed identity assigned to an Azure resource.
Why this is correct
Managed identities authenticate without storing keys.
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 may incorrectly assume OAuth2 tokens from Microsoft Entra ID for a user are a valid standalone method, but Azure Blob Storage requires the user to be authenticated via Azure AD first, and the token is obtained as part of that flow, not as a direct authentication mechanism like a key or SAS.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
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, and is commonly used for development or scenarios where fine-grained access control is not required.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are valid ways to authenticate to Azure Blob Storage from an application? (Choose two.)
medium
A.Microsoft account (personal) OAuth token
B.SQL Server authentication
✓ C.Storage account access key
✓ D.Shared access signature (SAS) token
E.Azure Cosmos DB primary key
Why C: Option C is correct because a storage account access key provides full administrative access to the storage account, including Blob Storage. Applications can authenticate by including the key in the Authorization header using the SharedKey scheme, which HMAC-SHA256 signs the request. This is a standard, documented method for authenticating to Azure Blob Storage.
Last reviewed: Jun 24, 2026
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