The answer is to enable session support on Event Hubs and use the session-enabled trigger in Azure Functions. Session support guarantees that all events with the same partition key are routed to the same partition and processed sequentially, preserving order. The session-enabled trigger, combined with checkpointing, records the last successfully processed event offset; when the function restarts or scales, it resumes from that checkpoint, ensuring each event is processed exactly once within the partition. On the AZ-204 exam, this scenario tests your understanding of how to maintain order and idempotency in distributed event-driven architectures—a common trap is confusing checkpointing alone with exactly-once delivery, but checkpointing only guarantees at-least-once without sessions. Remember the mnemonic: “Sessions for sequence, checkpoints for certainty.”
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. 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.
You are designing a solution that uses Azure Functions to process events from Azure Event Hubs. Which TWO features should you enable to ensure the function processes events in order and exactly once?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement checkpointing in the function
Option C is correct because checkpointing in Azure Functions allows the function to record the last successfully processed event offset and partition. When the function resumes, it reads from that checkpoint, ensuring that events are processed exactly once within the partition, even if the function restarts or scales.
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.
✗
Durable Functions
Why it's wrong here
Durable Functions are for orchestrating workflows, not for Event Hubs ordered processing.
✗
Process events in batches
Why it's wrong here
Batch processing does not guarantee order; it may interleave events from different partitions.
✓
Implement checkpointing in the function
Why this is correct
Checkpointing stores the last processed event offset, ensuring exactly-once processing.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable session support on Event Hubs and use the session-enabled trigger
Why this is correct
Sessions ensure ordered delivery; session-enabled trigger processes each session in order.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a retry policy in the function
Why it's wrong here
Retry policy handles transient failures but does not guarantee ordering or exactly-once.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think Durable Functions or retry policies guarantee exactly-once processing, but they do not address the fundamental need for checkpointing and session-aware consumption to maintain order and prevent duplicates in a distributed event processing system.
Detailed technical explanation
How to think about this question
Event Huses partitions maintain order within the partition, and checkpointing stores the sequence number or offset in an external store (e.g., Azure Blob Storage) so the function can resume from that point. Session support on Event Hubs (using the EventProcessorClient with a session-enabled consumer group) ensures that all events with the same partition key are processed by the same function instance, preserving order and enabling exactly-once processing when combined with checkpointing.
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.
TExam Day Tips
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
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: Implement checkpointing in the function — Option C is correct because checkpointing in Azure Functions allows the function to record the last successfully processed event offset and partition. When the function resumes, it reads from that checkpoint, ensuring that events are processed exactly once within the partition, even if the function restarts or scales.
What should I do if I get this AZ-204 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You are designing a solution that uses Azure Functions to process events from Azure Event Hubs. The function must process events in order and exactly once per partition. What should you do?
hard
A.Enable session state in the function app.
B.Use a Service Bus queue trigger with a singleton lock.
C.Disable checkpointing to ensure no duplicates.
✓ D.Use the Event Hubs trigger for Azure Functions with default configuration.
Why D: The Event Hubs trigger for Azure Functions, by default, processes events in order and exactly once per partition. It uses checkpointing to track the offset of the last successfully processed event, ensuring that each event is processed only once and in sequence within a partition. This default behavior aligns with the requirement without needing additional configuration.
Last reviewed: Jun 24, 2026
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This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.
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