Quick Answer
The answer is Microsoft Entra ID (formerly Azure AD) authentication and Shared Key authentication. These are the two valid authentication options for accessing Azure Storage from an application because Shared Key uses the storage account key to sign every request via HMAC-SHA256 in the Authorization header, granting full administrative access, while Microsoft Entra ID leverages OAuth 2.0 tokens and role-based access control (RBAC) for fine-grained, keyless access. On the AZ-204 exam, this distinction tests your understanding of when to use account keys for legacy or simple scenarios versus Entra ID for secure, managed identity-based access—a common trap is confusing Shared Key with Shared Access Signatures (SAS), which are a separate delegated access method. Remember the mnemonic “Key for Keys, Entra for Roles” to recall that Shared Key unlocks everything, while Entra ID assigns specific roles.
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 TWO of the following are valid authentication options for accessing Azure Storage from an application? (Choose TWO.)
Storage account key (Shared Key).
Shared Key is a valid authentication method.
Microsoft Entra ID (formerly Azure AD) authentication.
Entra ID provides authentication via RBAC.
Certificate-based authentication.
Why wrong: Not supported for Azure Storage.
Managed Service Identity (MSI).
Why wrong: MSI is an identity, not an authentication method.
Shared access signature (SAS) token.
Why wrong: SAS is authorization, not authentication.
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 account key (Shared Key).
Option A is correct because the storage account key (Shared Key) provides full administrative access to the storage account, allowing the application to authenticate requests via the Authorization header using HMAC-SHA256. Option B is correct because Microsoft Entra ID (formerly Azure AD) supports role-based access control (RBAC) for Azure Storage, enabling applications to authenticate using OAuth 2.0 tokens for fine-grained access without exposing account keys.
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 key (Shared Key).
Why this is correct
Shared Key is a valid authentication method.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Entra ID (formerly Azure AD) authentication.
Why this is correct
Entra ID provides authentication via RBAC.
Related concept
Read the scenario before looking for a memorised answer.
Certificate-based authentication.
Why it's wrong here
Not supported for Azure Storage.
Managed Service Identity (MSI).
Why it's wrong here
MSI is an identity, not an authentication method.
Shared access signature (SAS) token.
Why it's wrong here
SAS is authorization, not authentication.
Common exam traps
The trap here is that candidates often confuse Managed Service Identity (MSI) as a standalone authentication method, when in reality it is an identity provider that relies on Entra ID tokens, and they may also mistake SAS tokens as an authentication option rather than a delegated authorization mechanism.
Detailed technical explanation
Under the hood, Shared Key authentication uses the storage account name and key to compute an HMAC-SHA256 signature over the request, which is validated by the storage service. Entra ID authentication leverages OAuth 2.0 tokens, where the application obtains a token from the Microsoft identity platform and includes it in the Authorization header as a Bearer token. A real-world scenario: using Entra ID allows you to revoke access for a specific user or application without rotating the storage account key, improving security in multi-tenant environments.
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
Develop for Azure storage — This question tests Develop for Azure storage — Read the scenario before looking for a memorised answer..
The correct answer is: Storage account key (Shared Key). — Option A is correct because the storage account key (Shared Key) provides full administrative access to the storage account, allowing the application to authenticate requests via the Authorization header using HMAC-SHA256. Option B is correct because Microsoft Entra ID (formerly Azure AD) supports role-based access control (RBAC) for Azure Storage, enabling applications to authenticate using OAuth 2.0 tokens for fine-grained access without exposing account keys.
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
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.
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