Question 625 of 997

Connect to and consume Azure services and third-party services →hardMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to use IoT Hub's built-in Event Hub-compatible endpoint with a consumer group that has one partition per device. This works because IoT Hub’s Event Hub-compatible endpoint partitions messages by device ID by default, ensuring that all telemetry from a single device lands in the same partition, which preserves the order of messages. To achieve exactly once processing, you must also implement idempotent processing in your Azure Function, since the Event Hub-compatible endpoint itself guarantees at-least-once delivery. On the AZ-204 exam, this question tests your understanding of how to combine IoT Hub’s partitioning model with consumer groups to solve the common challenge of IoT Hub message ordering exactly once per device. A frequent trap is confusing device twin updates or cloud-to-device messaging for telemetry ordering; remember that only the Event Hub-compatible endpoint provides ordered, partition-based streams. Memory tip: “One device, one partition, one order.”

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 develop an IoT solution using Azure IoT Hub. Devices send telemetry data that must be processed by a custom Azure Function. You need to ensure that the Function processes messages in order per device and exactly once. Which IoT Hub feature should you use?

Question 1hardmultiple choice

Read the full network assurance explanation →

A
Use IoT Hub message routing to send messages to a Service Bus queue, and process from the queue.
Why wrong: Service Bus queues do not guarantee exactly-once delivery unless you implement deduplication, and ordering is not guaranteed across partitions.
B
Use IoT Hub direct methods to invoke the Function per device.
Why wrong: Direct methods are for command and control, not for telemetry ingestion.
C
Use IoT Hub device twins to store telemetry and trigger the Function on twin changes.
Why wrong: Device twins are for state, not for telemetry streaming; they are not designed for high-throughput telemetry.
D
Use IoT Hub's built-in Event Hub-compatible endpoint with a consumer group that has one partition per device.
Event Hubs support per-partition ordering; with partition key = device ID, messages from a device go to the same partition, ensuring order and at-least-once delivery; idempotent processing can achieve exactly-once.

Full breakdown with real-world context →

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

✓

Use IoT Hub's built-in Event Hub-compatible endpoint with a consumer group that has one partition per device.

IoT Hub's Event Hub-compatible endpoint supports consumer groups, but for ordered processing per device, you need to partition by device ID. Option D is correct because using the built-in endpoint with a consumer group per partition ensures ordering. Option A does not guarantee exactly once; Option B is for device management; Option C is for cloud-to-device.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Use IoT Hub message routing to send messages to a Service Bus queue, and process from the queue.
Why it's wrong here
Service Bus queues do not guarantee exactly-once delivery unless you implement deduplication, and ordering is not guaranteed across partitions.
✗
Use IoT Hub direct methods to invoke the Function per device.
Why it's wrong here
Direct methods are for command and control, not for telemetry ingestion.
✗
Use IoT Hub device twins to store telemetry and trigger the Function on twin changes.
Why it's wrong here
Device twins are for state, not for telemetry streaming; they are not designed for high-throughput telemetry.
✓
Use IoT Hub's built-in Event Hub-compatible endpoint with a consumer group that has one partition per device.
Why this is correct
Event Hubs support per-partition ordering; with partition key = device ID, messages from a device go to the same partition, ensuring order and at-least-once delivery; idempotent processing can achieve exactly-once.
Related concept
Static NAT maps one inside address to one outside address.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Trap categories for this question

Command / output trap
Direct methods are for command and control, not for telemetry ingestion.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-204 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this AZ-204 question test?

Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Use IoT Hub's built-in Event Hub-compatible endpoint with a consumer group that has one partition per device. — IoT Hub's Event Hub-compatible endpoint supports consumer groups, but for ordered processing per device, you need to partition by device ID. Option D is correct because using the built-in endpoint with a consumer group per partition ensures ordering. Option A does not guarantee exactly once; Option B is for device management; Option C is for cloud-to-device.

What should I do if I get this AZ-204 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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