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 are designing a serverless application using Azure Functions. The solution must process messages from an Azure Service Bus queue and update a Cosmos DB database. Which binding configuration should you use on the function?
Service Bus trigger with Table storage output binding
Why wrong: Requires Cosmos DB, not Table storage.
Blob trigger with Cosmos DB output binding
Why wrong: Blob trigger responds to blob changes, not queue messages.
HTTP trigger with Cosmos DB input binding
Why wrong: HTTP is not for queue messages.
Service Bus trigger with Cosmos DB output binding
Correct combination for queue-triggered DB update.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Service Bus trigger with Cosmos DB output binding
Option D is correct because the requirement specifies processing messages from an Azure Service Bus queue and updating a Cosmos DB database. A Service Bus trigger binds the function to the queue, and a Cosmos DB output binding writes the processed data directly to Cosmos DB, enabling a seamless serverless workflow without additional code for database operations.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Service Bus trigger with Table storage output binding
Why it's wrong here
Requires Cosmos DB, not Table storage.
Blob trigger with Cosmos DB output binding
Why it's wrong here
Blob trigger responds to blob changes, not queue messages.
HTTP trigger with Cosmos DB input binding
Why it's wrong here
HTTP is not for queue messages.
Service Bus trigger with Cosmos DB output binding
Why this is correct
Correct combination for queue-triggered DB update.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse output bindings with input bindings or choose a trigger that does not match the event source, such as selecting a Blob or HTTP trigger when the requirement explicitly states a Service Bus queue as the message source.
Detailed technical explanation
Under the hood, the Service Bus trigger uses the AMQP 1.0 protocol to receive messages from the queue, and the Cosmos DB output binding leverages the Azure Cosmos DB SDK to perform upsert operations on the specified container. In real-world scenarios, this pattern is ideal for event-driven architectures where incoming messages represent data changes that must be persisted, such as order processing or IoT telemetry ingestion, and the binding handles retry policies and batch writes automatically.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Service Bus trigger with Cosmos DB output binding — Option D is correct because the requirement specifies processing messages from an Azure Service Bus queue and updating a Cosmos DB database. A Service Bus trigger binds the function to the queue, and a Cosmos DB output binding writes the processed data directly to Cosmos DB, enabling a seamless serverless workflow without additional code for database operations.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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