AZ-204 Research & Evidence-Based Practice 3 — Questions and Answers
Question 1: In Azure Functions, which trigger type monitors a Service Bus queue depth and automatically scales instances to process backlogged messages?
- HTTP trigger
- Timer trigger
- Service Bus trigger (Correct answer)
- Event Grid trigger
Correct answer: Service Bus trigger
The Service Bus trigger integrates with KEDA-based scaling to spin up additional function instances as queue depth increases.
Question 2: Which Durable Functions orchestration pattern fans out work across multiple parallel activity functions and then waits for all results before continuing?
- Function chaining
- Fan-out/fan-in (Correct answer)
- External events
- Eternal orchestrations
Correct answer: Fan-out/fan-in
The fan-out/fan-in pattern starts multiple activity tasks concurrently with Task.WhenAll and aggregates their results once all complete.
Question 3: What is the maximum execution timeout for an Azure Function running on the Consumption hosting plan?
- 5 minutes
- 10 minutes (Correct answer)
- 15 minutes
- 30 minutes
Correct answer: 10 minutes
The Consumption plan caps function execution at 10 minutes (600 seconds); the default timeout is 5 minutes but can be raised to this ceiling.
Question 4: Which Azure Service Bus feature guarantees that related messages are processed in order by a single consumer at a time?
- Dead-letter queue
- Message sessions (Correct answer)
- Auto-forwarding
- Duplicate detection
Correct answer: Message sessions
Sessions group messages by a session ID and ensure a single receiver processes all messages in that session sequentially.
Question 5: Which Azure Event Hubs feature automatically captures streaming event data and writes it to Azure Blob Storage or Azure Data Lake?
- Consumer groups
- Event Hubs Capture (Correct answer)
- Schema Registry
- Partitioned receivers
Correct answer: Event Hubs Capture
Event Hubs Capture writes incoming events to a storage destination on a configurable time or size window, enabling batch analytics.
Question 6: What happens to an Azure Service Bus message that has been delivered more times than its configured maximum delivery count?
- It is immediately deleted from the queue
- It is moved to the dead-letter queue (Correct answer)
- It is returned to the sending application
- It is archived to Azure Blob Storage
Correct answer: It is moved to the dead-letter queue
After exceeding the maximum delivery count, Service Bus automatically transfers the message to the associated dead-letter subqueue for inspection.
Question 7: In Azure Functions, which binding type injects data from an external source such as Azure Blob Storage directly into a function parameter for reading?
- Input binding (Correct answer)
- Output binding
- Trigger binding
- Connection binding
Correct answer: Input binding
Input bindings supply data to the function at invocation time, removing the need to write explicit SDK calls to read the source.
AZ-204 Research & Evidence-Based Practice 3
In Azure Functions, which trigger type monitors a Service Bus queue depth and automatically scales instances to process backlogged messages?