Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company needs to store sensor data from IoT devices. Each device sends a message every second. The data is time-series and will be queried for real-time dashboards and historical analysis. The solution must support high ingestion rates and low-latency queries on recent data. Which Azure service should they use?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Azure Blob Storage with Azure Data Lake Storage Gen2
Blob Storage is for object storage and does not natively support low-latency queries required for real-time dashboards.
B
Distractor review
Azure Cosmos DB with SQL API
Cosmos DB is a globally distributed NoSQL database, but it is not optimized for high-ingestion time-series workloads and can be cost-prohibitive at this scale.
C
Best answer
Azure Event Hubs and Azure Data Explorer
Event Hubs ingests high volumes of event data, and Azure Data Explorer provides fast, real-time analytics on time-series data. This combination is best suited for IoT sensor data.
D
Distractor review
Azure Table Storage
Table Storage is a key-value store with limited query capabilities and does not support the low-latency analytical queries required for this scenario.
Common exam trap
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.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A company is designing hub-and-spoke networking. Spoke VNets must use a central Azure Firewall for outbound internet traffic. Which two configurations are required?
Question 2
A company is designing private access to a PaaS database from workloads in a VNet. The database should not be reachable over its public endpoint. What should be recommended?
Question 3
A data platform must support analytical queries over petabytes of files in a data lake, while preserving hierarchical namespaces and fine-grained ACLs. Which storage service should you design around?
Question 4
A database workload has an RPO of 15 minutes and an RTO of 4 hours. Cost is more important than near-zero data loss. Which design is usually more appropriate than synchronous multi-region replication?
Question 5
A hub-and-spoke Azure network must centralize outbound inspection and still allow spokes to resolve private endpoint DNS names. Which two components are commonly required? (Choose 2.)
Question 6
A multinational company uses Microsoft Entra ID and several Azure subscriptions. Security administrators need to review privileged role assignments every month and require justification for continued access. Which design should be recommended?
FAQ
Questions learners often ask
What does this AZ-305 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Azure Event Hubs and Azure Data Explorer — Azure Data Explorer (ADX) is optimized for time-series data, high ingestion throughput, and low-latency queries using Kusto Query Language (KQL). It is ideal for real-time analytics on streaming data. Azure Event Hubs can be used as an ingestion intermediary, but the primary storage and query service should be ADX. Blob Storage and Table Storage are not designed for real-time queries. Cosmos DB with SQL API can handle high throughput but is not purpose-built for time-series and is more expensive for this use case.
What should I do if I get this AZ-305 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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