AWS Certified Cloud Practitioner — Question 339

Which AWS service uses a combination of publishers and subscribers?

Answer options

• A. AWS Lambda
• B. Amazon Simple Notification Service (Amazon SNS)
• C. Amazon Cloud Watch
• D. AWS CloudFormation

Correct answer: B

Explanation

Amazon Simple Notification Service (Amazon SNS) is a fully managed messaging service designed specifically around the publisher-subscriber (pub/sub) pattern. AWS Lambda is a serverless compute service, Amazon CloudWatch is used for monitoring and observability, and AWS CloudFormation is an infrastructure-as-code service, none of which utilize a publisher-subscriber architecture as their core model.