The correct approach is to use Key Vault references in the function app settings. This method stores OAuth 2.0 credentials—such as client ID and client secret—as secure references within the application settings of your Azure Functions app, rather than embedding them in code or configuration files. At runtime, the function app resolves these references by authenticating to Azure Key Vault using a managed identity, ensuring that sensitive API credentials are never exposed in plaintext or accessible through source control. On the AZ-204 exam, this scenario tests your understanding of secure credential management for serverless applications, often appearing as a distractor against options like environment variables or encrypted configuration files. A common trap is assuming that App Service application settings are encrypted by default—they are, but Key Vault references provide centralized control and rotation without redeployment. Memory tip: think “KV refs = runtime resolve, no plaintext, no redeploy.”
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 need to deploy an Azure Functions app that runs on a dedicated App Service plan. The function must be triggered by an HTTP request and call a downstream API that requires OAuth 2.0 authentication. Which approach should you use to store the API credentials securely?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Key Vault references in the function app settings
Option C is correct because Azure Key Vault references in function app settings allow you to securely store and retrieve sensitive information like OAuth 2.0 credentials (client ID, client secret) without exposing them in code or configuration files. The function app resolves these references at runtime using a managed identity, ensuring credentials are never stored in plaintext or accessible via source control.
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 Azure App Configuration with plain text
Why it's wrong here
Plain text is not secure; App Configuration can store encrypted values but Key Vault is preferred for secrets.
✗
Store credentials in a configuration file in the deployment package
Why it's wrong here
Configuration files in deployment can be exposed.
✓
Use Key Vault references in the function app settings
Why this is correct
Key Vault references securely inject secrets.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store credentials in the function code as constants
Why it's wrong here
Hardcoding credentials is insecure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure App Configuration (a configuration store) with Azure Key Vault (a secrets store), assuming both are equally secure for credentials, but App Configuration does not natively encrypt values or support managed identity-based access for secrets without Key Vault integration.
Detailed technical explanation
How to think about this question
Key Vault references use the syntax @Microsoft.KeyVault(SecretUri=https://myvault.vault.azure.net/secrets/mysecret/) and are resolved by the Azure Functions runtime via a system-assigned or user-assigned managed identity. The function app must have the appropriate Key Vault access policy (Get and List permissions) for the identity, and the secret is retrieved at runtime, not at deployment, enabling automatic rotation without redeployment. This approach aligns with the OAuth 2.0 client credentials flow, where the client secret must be kept confidential.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Key Vault references in the function app settings — Option C is correct because Azure Key Vault references in function app settings allow you to securely store and retrieve sensitive information like OAuth 2.0 credentials (client ID, client secret) without exposing them in code or configuration files. The function app resolves these references at runtime using a managed identity, ensuring credentials are never stored in plaintext or accessible via source control.
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.