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 developing a solution that processes orders. Each order must be processed exactly once, in the order it was received. You need to choose an Azure service that guarantees FIFO delivery and at-least-once processing. Which service should you use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Azure Service Bus Queue with sessions
Azure Service Bus queues with sessions provide FIFO guarantee and duplicate detection.
Azure Event Hubs
Why wrong: Azure Event Hubs is for high-throughput event ingestion, not FIFO.
Azure Event Grid
Why wrong: Azure Event Grid is for event routing, not FIFO.
Azure Storage Queue
Why wrong: Azure Storage Queue does not guarantee FIFO ordering.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Service Bus Queue with sessions
Azure Service Bus Queue with sessions is correct because it provides FIFO (first-in, first-out) delivery by grouping related messages into sessions, ensuring messages within a session are processed in order. The at-least-once processing guarantee is inherent to Service Bus queues, as messages are not removed until the receiver completes them, and they can be redelivered if the processing fails or times out.
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.
Azure Service Bus Queue with sessions
Why this is correct
Azure Service Bus queues with sessions provide FIFO guarantee and duplicate detection.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Azure Event Hubs
Why it's wrong here
Azure Event Hubs is for high-throughput event ingestion, not FIFO.
Azure Event Grid
Why it's wrong here
Azure Event Grid is for event routing, not FIFO.
Azure Storage Queue
Why it's wrong here
Azure Storage Queue does not guarantee FIFO ordering.
Common exam traps
The trap here is that candidates often confuse Azure Storage Queue's 'first-in, first-out' appearance with true FIFO, but it does not guarantee order due to its visibility timeout and dequeuing behavior, making Service Bus sessions the only correct choice for strict FIFO with at-least-once processing.
Detailed technical explanation
Under the hood, Azure Service Bus sessions use a session ID to lock a sequence of messages, ensuring that a single receiver processes them in order; the broker maintains a session state and uses a lock to prevent concurrent processing. In a real-world scenario, if an order processing system requires strict sequential processing (e.g., payments must be processed before shipping), sessions ensure that all messages for a given order ID are handled in order, even across multiple receivers. The at-least-once guarantee is enforced by the Peek-Lock mechanism, where the message is not permanently removed until the receiver calls Complete(), allowing redelivery on failure.
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: Azure Service Bus Queue with sessions — Azure Service Bus Queue with sessions is correct because it provides FIFO (first-in, first-out) delivery by grouping related messages into sessions, ensuring messages within a session are processed in order. The at-least-once processing guarantee is inherent to Service Bus queues, as messages are not removed until the receiver completes them, and they can be redelivered if the processing fails or times out.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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