- A
After user authentication, have the client generate a SAS token using the storage account key retrieved from a secure endpoint.
Why wrong: Exposing the storage account key to the client is a security risk.
- B
After user authentication, use the server-side code to generate a user delegation SAS for a specific blob container path that includes the user's identifier. Store the SAS in the user's session and return it to the client. The client then uses the SAS to upload the file directly to Blob Storage.
User delegation SAS is scoped to the user and can be generated without exposing the account key.
- C
After user authentication, use the server-side code to generate a service SAS for the entire blob container. Return the SAS to the client. The client uploads the file, and the server later moves the file to a user-specific folder.
Why wrong: A service SAS for the entire container gives access to all blobs, violating the requirement that each user only sees their own files.
- D
After user authentication, use the server to upload the file to Blob Storage using the storage account key. Then return the URL of the uploaded blob to the client.
Why wrong: Using the storage account key on the server is a security risk and does not scale.
Quick Answer
The correct approach is to generate a user delegation SAS token on the server after authentication, scoped to a blob container path that includes the user’s identifier. This works because a user delegation SAS is signed with Microsoft Entra ID credentials rather than a storage account key, tying the token directly to the authenticated user’s identity. By storing the SAS in the user’s session and returning it to the client for direct upload, you ensure each user can only access their own files while keeping the storage account key secure. On the AZ-204 exam, this scenario tests your understanding of delegated access versus shared access—a common trap is choosing a service SAS, which lacks user-level scoping and risks cross-user access. Remember the key distinction: user delegation SAS = user identity bound; service SAS = account wide. For a memory tip, think “User Delegation = User Identity” to avoid mixing up the two SAS types.
AZ-204 Implement Azure security Practice Question
This AZ-204 practice question tests your understanding of implement azure security. 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.
You are developing a web application that will be deployed to Azure App Service. The application allows users to upload files, which are stored in Azure Blob Storage. You need to ensure that only authenticated users can upload files and that each user can only see their own files. You plan to use shared access signatures (SAS) for secure access. The application uses Microsoft Entra ID for authentication. You want to generate SAS tokens on the server after the user authenticates. Which approach should you use?
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
After user authentication, use the server-side code to generate a user delegation SAS for a specific blob container path that includes the user's identifier. Store the SAS in the user's session and return it to the client. The client then uses the SAS to upload the file directly to Blob Storage.
Option A is correct because generating a user delegation SAS with the user's identity ensures that the SAS token is scoped to that user. Storing the SAS in the user's session and returning it to the client for direct upload is secure and efficient. Option B is wrong because a service SAS is not tied to the user's identity and would allow cross-user access. Option C is wrong because using the storage account key directly from the server is a security risk and does not tie the SAS to the user. Option D is wrong because client-side generation of SAS tokens requires the storage account key to be exposed to the client.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
After user authentication, have the client generate a SAS token using the storage account key retrieved from a secure endpoint.
Why it's wrong here
Exposing the storage account key to the client is a security risk.
- ✓
After user authentication, use the server-side code to generate a user delegation SAS for a specific blob container path that includes the user's identifier. Store the SAS in the user's session and return it to the client. The client then uses the SAS to upload the file directly to Blob Storage.
Why this is correct
User delegation SAS is scoped to the user and can be generated without exposing the account key.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
After user authentication, use the server-side code to generate a service SAS for the entire blob container. Return the SAS to the client. The client uploads the file, and the server later moves the file to a user-specific folder.
Why it's wrong here
A service SAS for the entire container gives access to all blobs, violating the requirement that each user only sees their own files.
- ✗
After user authentication, use the server to upload the file to Blob Storage using the storage account key. Then return the URL of the uploaded blob to the client.
Why it's wrong here
Using the storage account key on the server is a security risk and does not scale.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-204 NAT questions on configuration and troubleshooting.
- →
Implement Azure security — study guide chapter
Learn the concepts, then practise the questions
- →
Implement Azure security practice questions
Targeted practice on this topic area only
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Microsoft Azure Developer Associate AZ-204 study guide
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Implement Azure security — This question tests Implement Azure security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: After user authentication, use the server-side code to generate a user delegation SAS for a specific blob container path that includes the user's identifier. Store the SAS in the user's session and return it to the client. The client then uses the SAS to upload the file directly to Blob Storage. — Option A is correct because generating a user delegation SAS with the user's identity ensures that the SAS token is scoped to that user. Storing the SAS in the user's session and returning it to the client for direct upload is secure and efficient. Option B is wrong because a service SAS is not tied to the user's identity and would allow cross-user access. Option C is wrong because using the storage account key directly from the server is a security risk and does not tie the SAS to the user. Option D is wrong because client-side generation of SAS tokens requires the storage account key to be exposed to the client.
What should I do if I get this AZ-204 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-204 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 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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