AZ-204 Practice Question: Connect to and consume Azure services and third-party services
You are building a solution that processes orders from multiple regions. Orders must be processed in the order they are received, but processing can take up to 5 minutes. You need to ensure exactly-once processing and minimize latency. Which Azure service and configuration should you use?
⚠ Common exam trap
Many candidates confuse 'duplicate detection' with 'ordering,' but duplicate detection only prevents duplicate message IDs within a time window and does not guarantee FIFO order, while sessions are required for ordered processing.
Answer choices
Why each option matters
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 enabled
Azure Service Bus Queue with sessions enabled ensures FIFO (first-in-first-out) ordering and exactly-once processing by grouping related messages into sessions. Sessions guarantee that messages within a session are processed in order, and the lock mechanism prevents duplicate processing even if processing takes up to 5 minutes. This minimizes latency by avoiding the overhead of duplicate detection or consumer group coordination.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Azure Service Bus Queue with sessions enabled
Why this is correct
Azure Service Bus Queues with sessions enabled provide a robust mechanism for processing related messages in a guaranteed FIFO order. Sessions group messages by a SessionId, ensuring that all messages belonging to a specific session are delivered to a single receiver and processed sequentially. This capability is crucial for scenarios like order processing, where the sequence of operations for a single order must be maintained, and it facilitates achieving effective exactly-once processing within that session context.
- ✗
Azure Event Hubs with consumer groups
Why it's wrong here
Azure Event Hubs is optimized for high-throughput ingestion and processing of large volumes of events, often used for telemetry or stream analytics. While it guarantees ordering within a single partition, it explicitly does not guarantee FIFO ordering across partitions. For a solution requiring strict FIFO processing of related items like orders, where messages might be distributed across multiple partitions, Event Hubs with consumer groups alone would not meet the ordering requirement.
- ✗
Azure Service Bus Queue with duplicate detection enabled
Why it's wrong here
Azure Service Bus Queue with duplicate detection enabled is designed to prevent the re-processing of identical messages within a specified time window, using a MessageId to identify duplicates. This feature ensures at-most-once delivery semantics by discarding messages that have already been sent. However, duplicate detection does not inherently enforce the order in which distinct, non-duplicate messages are delivered or processed, meaning a later unique message could still be processed before an earlier unique message.
- ✗
Azure Queue Storage with poison messages
Why it's wrong here
Azure Queue Storage offers a simple, highly scalable, and cost-effective queueing service. However, it does not provide inherent guarantees for FIFO (First-In, First-Out) message ordering. While it supports handling "poison messages" (messages that repeatedly fail processing and are eventually moved to a dead-letter queue), this mechanism addresses message reliability and error handling, not the fundamental ordering guarantee for successful message delivery and processing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.