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DP-203 Exactly-once streaming services Practice Question
You are designing a data processing solution that requires exactly-once processing semantics for streaming data. Which two Azure services support exactly-once processing? (Choose two.)
⚠ Common exam trap
Many candidates confuse the ingestion guarantee of Event Hubs (at-least-once) with the processing guarantee of Stream Analytics, or mistakenly think that a storage service like Data Lake Storage Gen2 inherently provides processing semantics.
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 Stream Analytics
Azure Stream Analytics supports exactly-once processing by using checkpointing and event sourcing to ensure that each event is processed exactly once, even in the event of failures or restarts. It achieves this through its internal state management and the use of checkpoint offsets in the output sink, guaranteeing no duplicate or missed events.
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 Event Hubs
Why it's wrong here
Event Hubs provides at-least-once delivery; exactly-once requires processing logic.
- ✗
Azure Data Lake Storage Gen2
Why it's wrong here
It is a storage service, not a processing engine.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The DP-203 exam frequently reuses these exact scenarios with slightly different constraints.
✓Azure Stream AnalyticsCorrect answer▾
✗Azure Event HubsWrong answer — click to see why▾
Why this is wrong here
Event Hubs provides at-least-once delivery; exactly-once requires processing logic.
✗Azure Data Lake Storage Gen2Wrong answer — click to see why▾
Why this is wrong here
It is a storage service, not a processing engine.
Analysis generated from the official DP-203blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Courseiva writes every DP-203 question from scratch — 760 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DP-203 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 DP-203 exam.