The correct answer is to configure the Service Bus queue to dead-letter messages after a specified number of delivery attempts, using the MaxDeliveryCount property. This works because when an Azure Function fails to process a message, the Service Bus trigger does not rely on the function’s host-level retry policy; instead, Service Bus itself manages retries by redelivering the message each time the lock expires, incrementing the delivery count. Once that count exceeds MaxDeliveryCount, the message is automatically moved to the dead-letter queue, preserving it for investigation rather than being lost or retried infinitely. On the AZ-204 exam, this tests your understanding of how Service Bus triggers differ from other triggers—a common trap is assuming Durable Functions or host-level retry policies handle this, but Service Bus dead-lettering is the built-in poison message mechanism. Memory tip: think “MaxDeliveryCount = dead-letter gate”—once the gate count is exceeded, the message is safely quarantined.
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 architecture using Azure Functions for a data processing pipeline. The pipeline must process messages from an Azure Service Bus queue. Each message can take up to 5 minutes to process. You need to ensure that if a function fails, the message is not lost and is retried after a delay. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the Service Bus queue to dead-letter messages after a specified number of delivery attempts.
Option C is correct because Service Bus queue dead-lettering automatically moves poison messages after exceeding MaxDeliveryCount. Enabling dead-lettering ensures failed messages are preserved for later investigation. Option A is wrong because Durable Functions are for orchestrating long-running workflows, not for simple retry logic. Option B is wrong because Azure Functions host-level retry policy doesn't apply to Service Bus triggers; Service Bus itself handles retries via MaxDeliveryCount. Option D is wrong because using PeekLock mode with automatic completion on success is the default; if the function fails without calling complete, the lock expires and the message becomes visible again, which can cause infinite retries without dead-lettering.
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.
✗
Use the PeekLock message receive mode and manually complete the message only after successful processing.
Why it's wrong here
If function crashes without completing, message becomes visible again, leading to infinite retries without dead-lettering.
✗
Use Durable Functions with a retry policy.
Why it's wrong here
Overly complex for simple retry; Service Bus built-in retry is sufficient.
✗
Set the Azure Functions retry policy in the host.json file.
Why it's wrong here
Retry policy does not apply to Service Bus triggers.
✓
Configure the Service Bus queue to dead-letter messages after a specified number of delivery attempts.
Why this is correct
Prevents message loss and allows retries via MaxDeliveryCount.
Related concept
Read the scenario before looking for a memorised answer.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the Service Bus queue to dead-letter messages after a specified number of delivery attempts. — Option C is correct because Service Bus queue dead-lettering automatically moves poison messages after exceeding MaxDeliveryCount. Enabling dead-lettering ensures failed messages are preserved for later investigation. Option A is wrong because Durable Functions are for orchestrating long-running workflows, not for simple retry logic. Option B is wrong because Azure Functions host-level retry policy doesn't apply to Service Bus triggers; Service Bus itself handles retries via MaxDeliveryCount. Option D is wrong because using PeekLock mode with automatic completion on success is the default; if the function fails without calling complete, the lock expires and the message becomes visible again, which can cause infinite retries without dead-lettering.
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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Question Discussion
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