250+ Node Js MCQ With Online Practice Test

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.

Practice Test

201. What does it mean to "scale horizontally" in the context of Node.js application scalability?

Answer: Increasing the number of servers in the application's infrastructure

202. In Node.js application scaling, what is a common use case for horizontal scaling?

Answer: Handling increased traffic and concurrent users

203. What is the primary advantage of horizontal scaling in Node.js applications?

Answer: It improves application performance and fault tolerance by distributing the load across multiple servers.

204. In Node.js, what is the term for distributing incoming requests evenly among multiple server instances to optimize performance and resource utilization?

Answer: Load balancing

205. What is the primary goal of vertical scaling in Node.js application scalability?

Answer: To increase the processing power and capacity of a single server

206. Which Node.js module is commonly used for implementing a reverse proxy and load balancer to achieve horizontal scaling?

Answer: nginx

207. What is "caching" in the context of horizontal scaling for Node.js applications, and how does it contribute to performance optimization?

Answer: Caching is the process of optimizing server responses by storing and reusing frequently requested data.

208. What is a common technique for managing session data and maintaining user state in horizontally scaled Node.js applications?

Answer: Sticky sessions or session affinity

209. What is "auto-scaling" in the context of cloud-based Node.js applications, and how does it work?

Answer: Auto-scaling is the automatic adjustment of server resources based on traffic and workload, typically achieved through cloud provider services like AWS Auto Scaling or Azure AutoScale.

210. Which factor should be carefully considered when planning to scale a Node.js application vertically by upgrading the server hardware?

Answer: The impact on downtime and maintenance windows
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