AZ-204 Practice Question: Connect to and consume Azure services and third-party services
A company uses Azure Service Bus for messaging between microservices. They need to ensure that messages are processed in order within a partition. Which feature should they enable?
⚠ Common exam trap
Test-takers frequently confuse partitioning with ordering, but partitioning alone does not guarantee order; sessions must be explicitly enabled to achieve FIFO processing within a partition.
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
✓
Sessions
Sessions in Azure Service Bus provide strict message ordering and first-in-first-out (FIFO) guarantees within a session. By setting the SessionId property on messages, all messages with the same session ID are processed sequentially by a single receiver, ensuring order is preserved even across multiple partitions or competing consumers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Duplicate detection
Why it's wrong here
Azure Service Bus duplicate detection ensures that a message sent multiple times within a specified detection window, identified by its MessageId, is processed only once. While crucial for idempotent operations and preventing redundant processing, this feature operates independently of message sequence. It does not provide any mechanism to enforce a specific processing order for distinct messages, only to discard identical re-sends.
- ✗
Partitioning
Why it's wrong here
Partitioning for Azure Service Bus queues or topics distributes messages across multiple message brokers or message stores. This design significantly enhances throughput and availability by allowing parallel processing of messages across different partitions. However, because messages are routed to different partitions, there is no guarantee that messages sent in a specific order by a producer will be received in the same order by a consumer, as each partition operates independently.
- ✓
Sessions
Why this is correct
Azure Service Bus sessions enable the processing of related messages in a guaranteed First-In, First-Out (FIFO) order. By assigning a SessionId to messages, all messages belonging to that session are delivered to the same message receiver, ensuring sequential processing. This mechanism is essential for scenarios where the order of operations for a specific entity or conversation must be strictly maintained.
- ✗
Dead-letter queue
Why it's wrong here
The dead-letter queue (DLQ) in Azure Service Bus is a secondary sub-queue used to hold messages that cannot be delivered to any receiver or processed successfully. Messages are moved to the DLQ due to various reasons, such as exceeding delivery attempts, message expiration, or application-specific rejections. Its purpose is error handling and message recovery, not to enforce or maintain the order of messages during normal processing.
Go deeper
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Key term
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JA
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.