Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A manufacturing company collects sensor data from thousands of IoT devices every second. The data includes temperature, pressure, and vibration readings. The company needs to store this time-series data and perform real-time queries to detect anomalies, as well as run historical analysis. The data volume is extremely high and will grow continuously. The company wants a fully managed, serverless solution that can automatically scale to handle the data volume and provide built-in analytics functions for time-series. Which AWS service should the company 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
Amazon DynamoDB
Amazon DynamoDB is a fully managed NoSQL database that provides single-digit millisecond latency for key-value and document workloads. While it can store time-series data using techniques like time-to-live and write sharding, it lacks built-in time-series analytics functions and is less optimized for the high-ingestion rates and query patterns typical of IoT sensor data. It is not the best choice for this use case.
B
Best answer
Amazon Timestream
Amazon Timestream is a purpose-built time-series database that can efficiently ingest, store, and analyze trillions of time-stamped data points per day. It is serverless and auto-scaling, with built-in time-series analytics functions such as interpolation, smoothing, and approximation. This makes it the ideal choice for the company's IoT sensor data requirements.
C
Distractor review
Amazon ElastiCache for Redis
Amazon ElastiCache for Redis is an in-memory caching service that provides sub-millisecond latency for caching and session management use cases. It is not designed for persistent storage of large volumes of time-series data, nor does it provide built-in time-series analytics capabilities. It would be an inefficient and costly choice for this workload.
D
Distractor review
Amazon RDS for MySQL
Amazon RDS for MySQL is a managed relational database service suitable for traditional transactional workloads. While it can store time-series data, it is not optimized for the extreme write throughput and storage scalability required for thousands of IoT devices generating data every second. Additionally, it lacks specialized time-series query functions and would require significant manual optimization.
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 developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Amazon Timestream — Amazon Timestream is a fast, scalable, fully managed time-series database purpose-built for IoT and operational applications. It can ingest trillions of time-series data points per day and supports real-time and historical queries. DynamoDB is a NoSQL key-value and document database but lacks specialized time-series analytics. ElastiCache is an in-memory caching service, not designed for persistent time-series storage. Amazon RDS is a relational database service that is not optimized for high-volume time-series ingestion and querying.
What should I do if I get this CLF-C02 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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