250+ Node Js MCQ With Online Practice Test

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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.

211. What is the primary benefit of containerizing Node.js applications with Docker?

Answer: Portability and consistent environments

212. What is a "Docker image" in the context of containerization for Node.js applications?

Answer: A snapshot of the application and its dependencies, including the runtime environment

213. In a Dockerfile for a Node.js application, what is the purpose of the FROM instruction?

Answer: To specify the base image to build upon

214. What is the role of a "Docker container" in the context of Node.js application deployment?

Answer: To package the application and its dependencies in an isolated environment

215. Which Docker command is used to build a Docker image from a Dockerfile for a Node.js application?

Answer: docker build

216. How does Docker enable environment consistency and reproducibility for Node.js applications?

Answer: By including the entire application environment and dependencies within a Docker image

217. What is the purpose of the .dockerignore file when building Docker images for Node.js applications?

Answer: To exclude specific files or directories from being copied into the Docker image

218. Which Docker command is used to run a Docker container based on a previously built Docker image for a Node.js application?

Answer: docker run

219. In a multi-container application setup, what is the role of Docker Compose in orchestrating containers for a Node.js application?

Answer: To define and manage the application's services and their dependencies

220. What is the purpose of a "Docker registry" when deploying Node.js applications with Docker?

Answer: To store and share Docker images, making them available for deployment on various servers
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