Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A web app running in Azure App Service must read blobs from a storage account. The app must authenticate without storing secrets or SAS tokens, and administrators should grant only blob data permissions, not storage management permissions. What should you configure?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
The storage account access key in an application setting, because it works with any blob operation.
An access key is a secret and grants broad control over the storage account, which violates the requirement to avoid stored credentials and limit permissions.
B
Best answer
A system-assigned managed identity for the app with Storage Blob Data Reader assigned at the storage scope.
A managed identity lets the app authenticate to Azure Storage without storing credentials, and the Storage Blob Data Reader role grants only blob data read access. Assigning the role at the storage account scope keeps the permission focused on the intended resource while avoiding management-plane rights. This is the most secure operational pattern for an Azure-hosted app that only needs to read blobs.
C
Distractor review
The Contributor role on the storage account, because it includes both management and data permissions.
Contributor is a management-plane role and does not provide the specific blob data authorization pattern required here. It is also broader than needed.
D
Distractor review
A service endpoint on the subnet, because service endpoints are used for application authentication.
Service endpoints affect network reachability, not identity-based authentication. They do not replace the need for a managed identity or other credential mechanism.
Common exam trap
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Technical deep dive
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A route table contains these entries: 10.0.0.0/8 with next hop Virtual appliance, and 10.1.1.0/24 with next hop Virtual network gateway. Which next hop will Azure use for traffic to 10.1.1.5?
Question 2
You are deploying a stateless web application on Azure virtual machines. The solution must automatically add and remove instances based on CPU demand and allow all instances to be managed as one logical group. Which Azure compute feature should you deploy?
Question 3
You are deploying a Windows Server VM for an internal app. The VM must support Secure Boot and vTPM later, its OS disk must survive host moves, and the team wants the lowest-cost managed disk tier that still behaves like a normal writable OS disk. Which two choices should you make? Select two.
Question 4
You need to deploy several identical virtual machines and ensure that the failure of a single Azure host does not affect all of them. Which feature should you use?
Question 5
You need to connect VNet-Hub and VNet-Spoke so that resources in both virtual networks can communicate privately over the Microsoft backbone. Both virtual networks are in the same region. What should you configure?
Question 6
You need to create a storage account that provides the lowest-cost redundant storage for non-critical data and only needs protection against local disk or server failure within a single datacenter. Which redundancy option should you choose?
FAQ
Questions learners often ask
What does this AZ-104 question test?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: A system-assigned managed identity for the app with Storage Blob Data Reader assigned at the storage scope. — For an Azure-hosted application, a system-assigned managed identity is the cleanest way to authenticate to Storage without secrets. By assigning Storage Blob Data Reader, you grant only the data-plane permission needed to read blobs. This avoids account keys and SAS tokens, keeps credentials out of configuration, and follows least privilege. It is also easy to manage because the identity is tied to the app resource itself. Why others are wrong: A storage account key is a secret and is much broader than needed. Contributor is a management role and does not provide the right least-privilege data access model. Service endpoints only influence network pathing; they do not authenticate the application to Storage. The scenario explicitly asks for secretless authentication with only blob data permissions.
What should I do if I get this AZ-104 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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