The answer is Azure Managed Identities, the correct choice because this service allows applications running in Azure to access secrets and keys without storing credentials in code by providing an automatically managed identity in Azure AD. When an application uses a Managed Identity, Azure handles credential rotation and authentication automatically, so developers never have to embed connection strings or keys in their source code. On the AZ-900 exam, this concept tests your understanding of how Azure eliminates credential management for cloud workloads—a common trap is confusing Managed Identities with service principals or Key Vault itself, but remember that Managed Identities are the authentication mechanism, while Key Vault stores the secrets. For a memory tip, think “Managed Identities manage the messy credentials for you,” or use the mnemonic MIA: Managed Identities Authenticate—no keys in code, ever.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 Azure service provides a secure way for applications running in Azure to access secrets and keys without storing credentials in code?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Managed Identities
Azure Managed Identities (Option C) provide an automatically managed identity in Azure AD that applications can use to authenticate to any service supporting Azure AD authentication, including Key Vault, without storing any credentials in code. This eliminates the need for developers to manage secrets or keys, as the Azure infrastructure automatically rotates the identity's credentials.
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.
✗
Azure Key Vault
Why it's wrong here
Key Vault stores the secrets; Managed Identities provide the identity used to access Key Vault without credentials in code.
Managed Identities give Azure resources an Azure AD identity to authenticate to other services without credentials in code.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Certificate Manager
Why it's wrong here
Azure manages certificates for App Service domains; Managed Identities handle authentication without credentials.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Key Vault (a storage service) with the authentication mechanism itself, mistakenly thinking Key Vault eliminates the need for credentials in code, when in fact it still requires an identity to access it.
Detailed technical explanation
How to think about this question
Under the hood, Azure Managed Identities use a token-based authentication flow where the Azure Instance Metadata Service (IMDS) endpoint (169.254.169.254) provides an OAuth 2.0 access token to the application at runtime, which is then used to authenticate to Azure resources. The identity is tied to the lifecycle of the Azure resource (e.g., a VM or App Service), and credentials are automatically rotated by Azure every 8 days. In a real-world scenario, a web app using Managed Identities can access Azure SQL Database or Key Vault without any connection strings or secrets in configuration files, significantly reducing the attack surface.
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-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Managed Identities — Azure Managed Identities (Option C) provide an automatically managed identity in Azure AD that applications can use to authenticate to any service supporting Azure AD authentication, including Key Vault, without storing any credentials in code. This eliminates the need for developers to manage secrets or keys, as the Azure infrastructure automatically rotates the identity's credentials.
What should I do if I get this AZ-900 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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