The correct choice is Azure Event Hubs, because it is purpose-built for high-throughput IoT ingestion, handling millions of events per second while supporting exactly-once processing through partition-based offset management and checkpointing. This service achieves fault tolerance via built-in replication and availability zones, ensuring no data loss even during failures. On the Microsoft Azure Data Fundamentals DP-900 exam, this scenario tests your understanding of which Azure service specializes in real-time, large-scale event ingestion versus batch-oriented tools like Azure Blob Storage or IoT Hub. A common trap is confusing IoT Hub (for device management and bi-directional communication) with Event Hubs (for pure, high-throughput ingestion). Remember the memory tip: “Event Hubs for the firehose, IoT Hub for the control.”
DP-900 Describe core data concepts Practice Question
This DP-900 practice question tests your understanding of describe core data concepts. 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 implementing a data pipeline that ingests millions of events per second from IoT devices. The pipeline must tolerate failures and guarantee exactly-once processing. Which Azure service should you use to ingest the events?
Why wrong: IoT Hub is designed for device management and bi-directional communication, with lower event throughput than Event Hubs.
B
Azure Event Hubs
Event Hubs can ingest millions of events per second, supports checkpointing for exactly-once processing, and provides at-least-once delivery with idempotent consumers.
C
Azure Service Bus
Why wrong: Service Bus is for enterprise messaging with lower throughput and does not natively support exactly-once at high scale.
D
Azure Queue Storage
Why wrong: Queue Storage has lower throughput and guarantees at-least-once, not exactly-once.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Event Hubs
Azure Event Hubs is the correct choice because it is a big data streaming platform and event ingestion service designed for high-throughput scenarios, capable of ingesting millions of events per second. It supports exactly-once processing through checkpointing and partition-based offset management, and its built-in replication and availability zones provide fault tolerance.
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 IoT Hub
Why it's wrong here
IoT Hub is designed for device management and bi-directional communication, with lower event throughput than Event Hubs.
✓
Azure Event Hubs
Why this is correct
Event Hubs can ingest millions of events per second, supports checkpointing for exactly-once processing, and provides at-least-once delivery with idempotent consumers.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Service Bus
Why it's wrong here
Service Bus is for enterprise messaging with lower throughput and does not natively support exactly-once at high scale.
✗
Azure Queue Storage
Why it's wrong here
Queue Storage has lower throughput and guarantees at-least-once, not exactly-once.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure IoT Hub with Event Hubs because both handle IoT data, but IoT Hub is for device management and control, not for high-throughput event ingestion with exactly-once guarantees.
Detailed technical explanation
How to think about this question
Under the hood, Event Hubs uses a partitioned consumer model where each partition is an ordered sequence of events, and exactly-once processing is achieved by storing offsets in a checkpoint store (e.g., Azure Blob Storage) and using idempotent event handling. The AMQP 1.0 protocol enables efficient, low-latency ingestion, and the service can auto-inflate throughput units to handle sudden spikes, making it ideal for real-time analytics pipelines like those from IoT devices.
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 DP-900 question in full detail.
Describe core data concepts — This question tests Describe core data concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Event Hubs — Azure Event Hubs is the correct choice because it is a big data streaming platform and event ingestion service designed for high-throughput scenarios, capable of ingesting millions of events per second. It supports exactly-once processing through checkpointing and partition-based offset management, and its built-in replication and availability zones provide fault tolerance.
What should I do if I get this DP-900 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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Question Discussion
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