The answer is Azure Service Bus Topics and Subscriptions because they provide a true publish-subscribe model where each independent subscriber receives its own copy of every message that matches its filter criteria. This is achieved through SQL filters defined on subscriptions, which evaluate custom message properties to determine delivery, ensuring that subscribers only process relevant messages while the broker guarantees at-least-once delivery through persistent storage. On the AZ-204 exam, this scenario tests your ability to distinguish between Service Bus Topics and other messaging services like Event Grid or Event Hubs, which lack SQL-based filtering or per-subscriber message copies. A common trap is choosing Event Grid for its filtering capabilities, but remember that Event Grid uses event type and subject filtering, not SQL-like property filters, and does not guarantee message delivery in the same way. Memory tip: think “Topic + SQL Filter = Subscriber-specific copies with guaranteed delivery.”
AZ-204 Practice Question: Connect to and consume Azure services and third-party services
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. 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 building an event-driven application that needs to publish messages to multiple independent subscribers. Each subscriber must be able to filter messages based on custom properties, and each subscriber must receive all messages that match its filter, even if other subscribers have different filters. The solution must guarantee message delivery. Which Azure messaging service should you use?
Why wrong: Queue Storage provides simple FIFO queues with no built-in filtering or pub/sub pattern.
B
Azure Service Bus Topics and Subscriptions
You can create a topic with multiple subscriptions, each with its own filter. Each subscription receives a copy of messages that match its filter, supporting independent consumption.
C
Azure Service Bus Queues
Why wrong: Service Bus Queues are point-to-point; a message is consumed by a single receiver. They do not support multiple independent subscribers.
D
Azure Event Hubs
Why wrong: Event Hubs is designed for event ingestion and streaming. While it supports multiple consumer groups, it does not support message-level filtering like Service Bus topics.
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 Topics and Subscriptions
Azure Service Bus Topics and Subscriptions are designed for publish-subscribe messaging where multiple independent subscribers each receive a copy of every message that matches their filter criteria. The topic allows publishing messages with custom properties, and each subscription can define a SQL-like filter (using the `SqlFilter` class) to select only relevant messages. This ensures that all subscribers receive all messages matching their filter, with guaranteed delivery via the broker's persistent storage and at-least-once delivery semantics.
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.
✗
Azure Queue Storage
Why it's wrong here
Queue Storage provides simple FIFO queues with no built-in filtering or pub/sub pattern.
✓
Azure Service Bus Topics and Subscriptions
Why this is correct
You can create a topic with multiple subscriptions, each with its own filter. Each subscription receives a copy of messages that match its filter, supporting independent consumption.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Service Bus Queues
Why it's wrong here
Service Bus Queues are point-to-point; a message is consumed by a single receiver. They do not support multiple independent subscribers.
✗
Azure Event Hubs
Why it's wrong here
Event Hubs is designed for event ingestion and streaming. While it supports multiple consumer groups, it does not support message-level filtering like Service Bus topics.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Service Bus Queues (point-to-point) with Topics (publish-subscribe), or assume Event Hubs can handle per-subscriber filtering, but Event Hubs lacks broker-side filtering and guarantees each event is consumed by only one consumer per consumer group, not by multiple independent subscribers with custom filters.
Detailed technical explanation
How to think about this question
Under the hood, Azure Service Bus Topics use a broker that maintains a separate message copy for each subscription, enabling independent consumption and filtering via `SqlFilter` or `CorrelationFilter` expressions. The `SqlFilter` supports a subset of SQL-92 syntax (e.g., `sys.Label LIKE '%urgent%' OR user.customProp = 'high'`), allowing fine-grained routing. In a real-world scenario, a logistics system might publish a single order event to a topic, with one subscription filtering for 'region=US' to trigger domestic shipping and another filtering for 'value>1000' to trigger insurance processing — both subscriptions receive their matching messages independently, even if the filters overlap.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Service Bus Topics and Subscriptions — Azure Service Bus Topics and Subscriptions are designed for publish-subscribe messaging where multiple independent subscribers each receive a copy of every message that matches their filter criteria. The topic allows publishing messages with custom properties, and each subscription can define a SQL-like filter (using the `SqlFilter` class) to select only relevant messages. This ensures that all subscribers receive all messages matching their filter, with guaranteed delivery via the broker's persistent storage and at-least-once delivery semantics.
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.
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