Question 16 of 997

Connect to and consume Azure services and third-party services →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to use DefaultAzureCredential from the @azure/identity library when creating the ServiceBusClient. This is correct because DefaultAzureCredential automatically attempts multiple authentication sources in order, and when running in an Azure Container Instance with a user-assigned managed identity, it will use that identity if the environment variable AZURE_CLIENT_ID is set to the identity's client ID. On the AZ-204 exam, this pattern tests your understanding of managed identity authentication for Azure Service Bus SDK, specifically that DefaultAzureCredential is the recommended approach for serverless or containerized workloads over explicit ManagedIdentityCredential, which requires hardcoding the client ID. A common trap is reaching for connection strings or interactive credentials, but those violate security best practices for production. Remember the mnemonic: "Default picks the right identity when the client ID is set."

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.

Trey Research uses Azure Service Bus for messaging between microservices. One microservice written in Node.js needs to send messages to a queue. The team wants to use managed identity to authenticate to Service Bus. The microservice runs in an Azure Container Instance (ACI) with a user-assigned managed identity. The identity has been granted 'Sender' role on the Service Bus namespace. The team uses the @azure/service-bus SDK. Which code snippet should the developer use to create a ServiceBusClient?

Question 1hardmultiple choice

Full question →

A
const { ServiceBusClient } = require('@azure/service-bus'); const { InteractiveBrowserCredential } = require('@azure/identity'); const credential = new InteractiveBrowserCredential(); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential);
Why wrong: Incorrect: InteractiveBrowserCredential is for user interaction, not server.
B
const { ServiceBusClient } = require('@azure/service-bus'); const { DefaultAzureCredential } = require('@azure/identity'); const credential = new DefaultAzureCredential(); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential);
Correct: DefaultAzureCredential works with user-assigned MI if environment variable set.
C
const { ServiceBusClient } = require('@azure/service-bus'); const { ManagedIdentityCredential } = require('@azure/identity'); const credential = new ManagedIdentityCredential('<client-id>'); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential);
Why wrong: Incorrect: works but requires hardcoded client ID, not best practice.
D
const { ServiceBusClient } = require('@azure/service-bus'); const sbClient = new ServiceBusClient('<connection-string>');
Why wrong: Incorrect: uses connection string, not managed identity.

Full breakdown with real-world context →

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

✓

const { ServiceBusClient } = require('@azure/service-bus'); const { DefaultAzureCredential } = require('@azure/identity'); const credential = new DefaultAzureCredential(); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential);

Use DefaultAzureCredential which will use the user-assigned managed identity if the environment variable AZURE_CLIENT_ID is set to the identity's client ID. Option A is correct. Option B uses ManagedIdentityCredential but requires explicit client ID. Option C uses connection string. Option D uses InteractiveBrowserCredential, not for server scenarios.

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.

✗
const { ServiceBusClient } = require('@azure/service-bus'); const { InteractiveBrowserCredential } = require('@azure/identity'); const credential = new InteractiveBrowserCredential(); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential);
Why it's wrong here
Incorrect: InteractiveBrowserCredential is for user interaction, not server.
✓
const { ServiceBusClient } = require('@azure/service-bus'); const { DefaultAzureCredential } = require('@azure/identity'); const credential = new DefaultAzureCredential(); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential);
Why this is correct
Correct: DefaultAzureCredential works with user-assigned MI if environment variable set.
Related concept
Read the scenario before looking for a memorised answer.
✗
const { ServiceBusClient } = require('@azure/service-bus'); const { ManagedIdentityCredential } = require('@azure/identity'); const credential = new ManagedIdentityCredential('<client-id>'); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential);
Why it's wrong here
Incorrect: works but requires hardcoded client ID, not best practice.
✗
const { ServiceBusClient } = require('@azure/service-bus'); const sbClient = new ServiceBusClient('<connection-string>');
Why it's wrong here
Incorrect: uses connection string, not managed identity.

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.

What to study next

Got this wrong? Here's your next step.

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.

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FAQ

Questions learners often ask

What does this AZ-204 question test?

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: const { ServiceBusClient } = require('@azure/service-bus'); const { DefaultAzureCredential } = require('@azure/identity'); const credential = new DefaultAzureCredential(); const sbClient = new ServiceBusClient('<namespace>.servicebus.windows.net', credential); — Use DefaultAzureCredential which will use the user-assigned managed identity if the environment variable AZURE_CLIENT_ID is set to the identity's client ID. Option A is correct. Option B uses ManagedIdentityCredential but requires explicit client ID. Option C uses connection string. Option D uses InteractiveBrowserCredential, not for server scenarios.

What should I do if I get this AZ-204 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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