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
211. What is the primary benefit of containerizing Node.js applications with Docker?
A. Simplified database management
B. Improved security
C. Portability and consistent environments
D. Faster execution of JavaScript code
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Answer: Portability and consistent environments
212. What is a "Docker image" in the context of containerization for Node.js applications?
A. A diagram representing the application's architecture
B. A snapshot of the application and its dependencies, including the runtime environment
C. A container management tool
D. A code editor for JavaScript
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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?
A. To specify the application's entry point
B. To define environment variables
C. To specify the base image to build upon
D. To create a new Docker container
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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?
A. To execute code on the client-side
B. To simulate a physical server
C. To package the application and its dependencies in an isolated environment
D. To manage database migrations
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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?
A. docker run
B. docker start
C. docker build
D. docker create
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Answer: docker build
216. How does Docker enable environment consistency and reproducibility for Node.js applications?
A. By automatically optimizing database queries
B. By including the entire application environment and dependencies within a Docker image
C. By providing a code repository for Node.js applications
D. By facilitating real-time monitoring of application performance
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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?
A. To exclude specific files or directories from being copied into the Docker image
B. To define environment variables
C. To specify the base image
D. To create a new Docker container
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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?
A. docker start
B. docker build
C. docker create
D. docker run
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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?
A. To run Node.js code in multiple containers simultaneously
B. To optimize database migrations
C. To define and manage the application's services and their dependencies
D. To create Docker images
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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?
A. To store and share Docker images, making them available for deployment on various servers
B. To monitor server performance
C. To manage load balancing
D. To create HTML templates
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Answer: To store and share Docker images, making them available for deployment on various servers
