CLF-C02 practice question: Developer, end-user and IoT services
Cloud Technology and Services A free question from our original CLF-C02 practice exam. Try it, then open the answer to see why each option is right or wrong.
A farm is installing 5,000 soil-moisture sensors across its fields.
Each sensor must send readings securely to the AWS Cloud using MQTT, a lightweight messaging protocol for devices, so the data can be stored and analyzed.
Which service should the sensors connect to?
Choose one answer.
AA. Amazon Kinesis Data Streams, which ingests large streams of records
BB. AWS IoT Core, which connects devices to AWS over MQTT and other protocols
CC. Amazon Simple Queue Service (Amazon SQS), a message queue for applications
DD. AWS Direct Connect, a dedicated network link into AWS
Show the answer and explanation
Answer: B
A. Wrong: Kinesis ingests records from applications that use the AWS SDKs and APIs. It does not accept MQTT connections directly from sensors.
B. Right: IoT Core lets devices connect securely to AWS and supports MQTT, so each sensor can publish its readings directly to the cloud. Learn more: AWS IoT Core (opens in a new tab)
C. Wrong: SQS queues messages for applications to process. It does not accept MQTT connections from devices.
D. Wrong: Direct Connect provides a private network connection between a site and AWS. It is a network path, not a service that devices use to exchange MQTT messages.
Explanation
AWS IoT Core is the managed service that lets devices connect securely to AWS over MQTT. The other options either ingest data from applications, queue messages between applications, or provide a network path rather than a device messaging service.
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