Learn how AWS Lambda enables developers to run code in response to events without managing servers. This guide is essential for mastering the AWS Certified Cloud Practitioner CLF-C02 exam.
Table of Contents
Question
What does AWS Lambda allow developers to do?
A. Manage EC2 instances
B. Run code in response to triggers
C. Automatically allocate Elastic IPs
D. Monitor applications in real-time
Answer
B. Run code in response to triggers
Explanation
AWS Lambda allows developers to run code in response to triggers such as data changes or user requests, without provisioning or managing servers.
AWS Lambda is a serverless compute service provided by Amazon Web Services (AWS). It allows developers to execute code in response to specific events or triggers without the need to manage or provision servers. This functionality makes it a highly efficient and scalable tool for building event-driven applications.
Key Features of AWS Lambda
Event-Driven Execution: Lambda functions are triggered by events from various AWS services, such as:
- File uploads to Amazon S3
- Updates in Amazon DynamoDB tables
- HTTP requests via Amazon API Gateway
- Real-time data streams from Amazon Kinesis
Serverless Architecture: Developers can focus solely on writing code, as AWS handles infrastructure management, including scaling, patching, and maintenance.
Automatic Scaling: Lambda automatically adjusts the number of function instances based on demand, ensuring high availability and cost efficiency.
Pay-As-You-Go Pricing: Costs are incurred only for the compute time used, measured in milliseconds.
Why Option B is Correct
AWS Lambda is specifically designed to run code in response to events or triggers, such as changes in data or user actions. For example:
- Processing uploaded files in an S3 bucket
- Responding to API requests via API Gateway
- Handling real-time log analysis with Amazon Kinesis.
Why Other Options Are Incorrect
A. Manage EC2 instances: EC2 instance management involves provisioning and maintaining virtual machines, which is unrelated to Lambda’s serverless model.
C. Automatically allocate Elastic IPs: Elastic IP allocation is a networking feature tied to EC2 instances, not Lambda.
D. Monitor applications in real-time: While AWS provides monitoring tools like CloudWatch, this is not a core function of Lambda itself.
AWS Lambda empowers developers by automating the execution of code based on predefined triggers, making it a cornerstone of modern serverless application development.
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