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
191. What is "SQL injection," and how can it be prevented in a Node.js application?
A. A method for optimizing database queries
B. A type of routing strategy
C. An attack where malicious SQL queries are injected into user inputs to manipulate the database
D. A feature for handling HTTP requests
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Answer: An attack where malicious SQL queries are injected into user inputs to manipulate the database
192. Which authentication method is considered more secure than storing passwords in plain text in a Node.js application's database?
A. Base64 encoding
B. Bcrypt hashing
C. MD5 hashing
D. URL encoding
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Answer: Bcrypt hashing
193. In Node.js, what is the purpose of using a secure connection (HTTPS) over HTTP for web communication?
A. To make the application slower
B. To provide a more user-friendly experience
C. To encrypt data transmission to protect against eavesdropping and man-in-the-middle attacks
D. To improve database migrations
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Answer: To encrypt data transmission to protect against eavesdropping and man-in-the-middle attacks
194. What is Cross-Site Request Forgery (CSRF) in the context of web security, and how can it be mitigated in Node.js applications?
A. A technique for load balancing
B. An attack where an authenticated user unknowingly performs actions on a different website
C. A type of routing strategy
D. An optimization technique
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Answer: An attack where an authenticated user unknowingly performs actions on a different website
195. Which tool or library in Node.js is commonly used for scanning and identifying security vulnerabilities in the application code?
A. npm audit
B. express-validator
C. fs
D. http
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Answer: npm audit
196. What is the primary goal of deploying a Node.js application to a production server?
A. To test the application's functionality
B. To make the application available for public use with high reliability and performance
C. To optimize database migrations
D. To develop new features
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Answer: To make the application available for public use with high reliability and performance
197. Which web server software is commonly used for serving Node.js applications in production?
A. Apache
B. Nginx
C. Tomcat
D. IIS
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Answer: Nginx
198. What is the purpose of a reverse proxy server like Nginx when deploying a Node.js application?
A. To add complexity to the server setup
B. To make the application slower
C. To improve security and performance by handling incoming requests and load balancing
D. To optimize database queries
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Answer: To improve security and performance by handling incoming requests and load balancing
199. In the context of production deployment, what does the term "load balancing" refer to?
A. The process of debugging code
B. The process of encrypting data
C. The distribution of incoming traffic across multiple server instances to improve scalability and reliability
D. The optimization of database migrations
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Answer: The distribution of incoming traffic across multiple server instances to improve scalability and reliability
200. What is the role of process managers like PM2 when deploying a Node.js application to a production server?
A. To create HTML templates
B. To handle database migrations
C. To monitor and manage Node.js processes, ensure they stay running, and provide features like auto-restart
D. To manage hardware devices
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Answer: To monitor and manage Node.js processes, ensure they stay running, and provide features like auto-restart
