The correct answer is Azure Stream Analytics because it is purpose-built for real-time stream processing and natively integrates with Azure Cosmos DB as a direct output sink, allowing you to process high-velocity IoT data and store results with minimal latency. Azure Stream Analytics uses a SQL-like query language to define transformations on streaming data, making it the most straightforward and efficient choice for this scenario. On the AZ-204 exam, this question tests your ability to differentiate between services optimized for streaming versus batch or storage workloads—a common trap is confusing Azure Data Lake Storage (a storage layer) or Azure Databricks (a complex analytics platform) with a dedicated stream processor. Remember that Stream Analytics is the only service here that offers a direct, no-code output to Cosmos DB for near real-time pipelines. Memory tip: think “Stream to Cosmos” for instant analytics.
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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 need to process large volumes of streaming data from IoT devices in near real-time. The processed data must be stored in Azure Cosmos DB for further analysis. Which Azure service should you use for stream processing?
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
Option C is correct because Azure Stream Analytics is designed for real-time stream processing and can output directly to Azure Cosmos DB. Option A is wrong because Azure Data Lake Storage is a storage service, not a stream processing service. Option B is wrong because Azure Databricks is a big data analytics platform, but it is not the most straightforward for simple stream processing to Cosmos DB; it requires more configuration. Option D is wrong because Azure Batch is for batch processing, not streaming.
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 Batch
Why it's wrong here
Azure Batch is for batch processing, not streaming.
✗
Azure Databricks
Why it's wrong here
Databricks is a big data analytics platform, but it is not the most straightforward for simple stream processing to Cosmos DB.
✗
Azure Data Lake Storage
Why it's wrong here
Data Lake Storage is a storage service, not a stream processing service.
✓
Azure Stream Analytics
Why this is correct
Stream Analytics is designed for real-time stream processing and can output directly to Cosmos DB.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 Stream Analytics — Option C is correct because Azure Stream Analytics is designed for real-time stream processing and can output directly to Azure Cosmos DB. Option A is wrong because Azure Data Lake Storage is a storage service, not a stream processing service. Option B is wrong because Azure Databricks is a big data analytics platform, but it is not the most straightforward for simple stream processing to Cosmos DB; it requires more configuration. Option D is wrong because Azure Batch is for batch processing, not streaming.
What should I do if I get this AZ-204 question wrong?
Identify which AZ-204 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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