Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company manages a fleet of millions of IoT devices that send telemetry data every minute. The data must be stored for 10 years to meet compliance requirements. For the first 30 days, data is accessed frequently for real-time dashboards and alerting. After 30 days, data is only accessed occasionally for historical analysis and reporting. The solution must be cost-effective and support high ingestion rates. Which Azure service should the company use to store and query this data?
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 provides scalable object storage but does not offer built-in time-series query capabilities. External tools are required for analysis, increasing complexity.
B
Best answer
Azure Data Explorer
Azure Data Explorer is optimized for time-series data, supports high ingestion rates, and provides both real-time and historical querying with automatic data tiering for cost effectiveness.
C
Distractor review
Azure SQL Database
Azure SQL Database is a relational database not designed for high-frequency time-series ingestion. It would be expensive and struggle with the required ingestion throughput.
D
Distractor review
Azure Cosmos DB with SQL API
Cosmos DB is a multi-model database but its cost and performance for massive time-series workloads are suboptimal compared to a purpose-built service like ADX.
Common exam trap
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.
Technical deep dive
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.
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Azure Data Explorer — Azure Data Explorer (ADX) is purpose-built for high-throughput time-series data ingestion, real-time analytics, and long-term retention with automatic data tiering. It provides low-latency queries on recent data and cost-effective storage for cold data. Azure Blob Storage lacks native query capabilities for time-series data. Azure SQL Database is not optimized for high-velocity time-series and becomes expensive at scale. Azure Cosmos DB is not designed for massive time-series data and would incur high costs due to indexing and request units.
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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