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 TWO of the following are valid ways to authenticate to Azure Blob Storage from an application? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Storage account access key
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.
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.
✗
Microsoft account (personal) OAuth token
Why it's wrong here
Personal Microsoft accounts are not supported for Azure Storage authentication.
✗
SQL Server authentication
Why it's wrong here
SQL authentication is for Azure SQL Database.
✓
Storage account access key
Why this is correct
Access key provides full access to the storage account.
Related concept
Read the scenario before looking for a memorised answer.
✓
Shared access signature (SAS) token
Why this is correct
SAS tokens provide delegated access to storage resources.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Cosmos DB primary key
Why it's wrong here
Cosmos DB keys are not valid for Blob Storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure AD authentication (which uses OAuth 2.0 tokens) with personal Microsoft account OAuth tokens, or mistakenly think Cosmos DB keys or SQL Server credentials can be reused across Azure services, when each service has its own distinct authentication mechanism.
Detailed technical explanation
How to think about this question
Under the hood, the storage account access key is used to compute a Hash-based Message Authentication Code (HMAC) with SHA-256, which is then sent as the Authorization header value in the format 'SharedKey <account>:<signature>'. The SAS token, on the other hand, is a URI query parameter that grants delegated access with specific permissions (read, write, delete, list) and time constraints, without exposing the account key. In real-world scenarios, SAS tokens are often used for temporary, scoped access (e.g., allowing a mobile app to upload a file), while the account key is reserved for backend services that need full control.
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: Storage account access key — 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.
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.
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Question Discussion
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