Node.js, often referred to as simply "Node," is a powerful open-source runtime environment that allows developers to execute JavaScript code outside of web browsers. It is designed for building scalable and efficient network applications, particularly on the server side. Node.js leverages a non-blocking, event-driven architecture, making it ideal for handling asynchronous operations and real-time applications. With its vast ecosystem of packages and modules available through npm (Node Package Manager), Node.js has become a popular choice for web development, microservices, APIs, and more, enabling developers to create high-performance applications with ease.
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Practice Test
221. What is the primary benefit of building serverless applications with AWS Lambda and Node.js?
A. Reduced scalability
B. Simplified infrastructure management
C. Increased hardware requirements
D. Improved database performance
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Answer: Simplified infrastructure management
222. In a serverless architecture, what is AWS Lambda's role in executing Node.js code?
A. Managing database connections
B. Running code in response to events without the need for server provisioning
C. Storing application data
D. Serving static files
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Answer: Running code in response to events without the need for server provisioning
223. What is the primary trigger for AWS Lambda functions in serverless applications?
A. Database queries
B. HTTP requests
C. Manual execution
D. Network monitoring
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Answer: HTTP requests
224. What is an "event source" in AWS Lambda for Node.js applications?
A. A Node.js package manager
B. A service or resource that triggers the execution of a Lambda function
C. A type of database
D. An external API
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Answer: A service or resource that triggers the execution of a Lambda function
225. In AWS Lambda, how can environment variables be set for Node.js functions?
A. They cannot be set; Lambda functions always use hard-coded values.
B. Through the AWS Management Console, AWS CLI, or AWS SDKs
C. By modifying the Lambda function code directly
D. By creating a separate JSON configuration file
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Answer: Through the AWS Management Console, AWS CLI, or AWS SDKs
226. What is the maximum execution duration for an AWS Lambda function by default?
A. 15 seconds
B. 60 seconds
C. 5 minutes
D. 30 minutes
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Answer: 60 seconds
227. How can AWS Lambda functions be invoked asynchronously in response to events in serverless applications?
A. Through HTTP GET requests only
B. By using the AWS SDKs or event sources such as S3, SNS, or API Gateway
C. By directly calling the Lambda function from the application code
D. By manually triggering the function execution
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Answer: By using the AWS SDKs or event sources such as S3, SNS, or API Gateway
228. What is "cold start" in the context of AWS Lambda and how can it affect serverless Node.js applications?
A. A type of AWS Lambda function that never executes
B. The initial startup time for a Lambda function, which can cause latency for the first invocation
C. A security feature of AWS Lambda
D. An event source for Lambda functions
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Answer: The initial startup time for a Lambda function, which can cause latency for the first invocation
229. What AWS service can be used to orchestrate the execution of multiple AWS Lambda functions in a serverless workflow?
A. Amazon RDS
B. Amazon DynamoDB
C. AWS Step Functions
D. AWS CloudFront
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Answer: AWS Step Functions
230. What does "npm" stand for in the context of Node.js development?
A. Node Package Manager
B. New Programming Model
C. Node Project Manager
D. Network Protocol Module
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Answer: Node Package Manager
