The answer is to use `var client = new SecretClient(new Uri(keyVaultUrl), new DefaultAzureCredential());`. This is correct because `DefaultAzureCredential` automatically chains multiple authentication sources, and when running on an Azure VM with a system-assigned managed identity enabled, it will seamlessly fall back to that identity without requiring any explicit client ID or secret. For the AZ-204 exam, this scenario tests your understanding of managed identity authentication for Azure resources, a core pattern for secure, credential-free access to services like Key Vault. A common trap is choosing `ManagedIdentityCredential` directly, which would require a client ID for a user-assigned identity, or `ClientSecretCredential`, which defeats the purpose of using a managed identity. Remember the memory tip: "Default does it all" — `DefaultAzureCredential` is the go-to when you want the SDK to figure out the right identity automatically, especially from a VM.
AZ-204 Practice Question: Connect to and consume Azure services and third-party services
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party 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.
Avanade is developing a .NET Core console application that runs on an Azure VM. The application needs to read a secret from Azure Key Vault. The VM has a system-assigned managed identity enabled. The managed identity has been granted 'Get' and 'List' permissions on the Key Vault secrets. The code uses the Azure.Identity and Azure.Security.KeyVault.Secrets NuGet packages. Which code snippet should the developer use to authenticate to Key Vault?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
var client = new SecretClient(new Uri(keyVaultUrl), new DefaultAzureCredential());
Use DefaultAzureCredential to automatically use the managed identity. Option A is correct. Option B uses ClientSecretCredential which requires a secret. Option C uses ManagedIdentityCredential but requires client ID for user-assigned. Option D uses EnvironmentCredential which requires environment variables.
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.
✗
var client = new SecretClient(new Uri(keyVaultUrl), new EnvironmentCredential());
Why it's wrong here
Incorrect: requires environment variables.
✓
var client = new SecretClient(new Uri(keyVaultUrl), new DefaultAzureCredential());
Why this is correct
Correct: DefaultAzureCredential will use system-assigned managed identity.
Related concept
Read the scenario before looking for a memorised answer.
✗
var client = new SecretClient(new Uri(keyVaultUrl), new ManagedIdentityCredential());
Why it's wrong here
Incorrect: ManagedIdentityCredential without client ID works for system-assigned, but DefaultAzureCredential is preferred and simpler.
✗
var client = new SecretClient(new Uri(keyVaultUrl), new ClientSecretCredential(tenantId, clientId, clientSecret));
Why it's wrong here
Incorrect: requires client secret.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: var client = new SecretClient(new Uri(keyVaultUrl), new DefaultAzureCredential()); — Use DefaultAzureCredential to automatically use the managed identity. Option A is correct. Option B uses ClientSecretCredential which requires a secret. Option C uses ManagedIdentityCredential but requires client ID for user-assigned. Option D uses EnvironmentCredential which requires environment variables.
What should I do if I get this AZ-204 question wrong?
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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