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.
Show All Answers
Practice Test
131. What is a WebSocket in the context of Node.js and web applications?
A. A protocol for encrypting data
B. A type of database
C. A communication protocol that provides full-duplex, bidirectional communication channels over a single TCP connection
D. A method for handling HTTP requests
Show Answer
Report This Question
Answer: A communication protocol that provides full-duplex, bidirectional communication channels over a single TCP connection
132. How is a WebSocket different from a traditional HTTP request in Node.js?
A. WebSockets use a different port number for communication.
B. WebSockets are unidirectional, while HTTP is bidirectional.
C. WebSockets provide full-duplex communication, allowing both the client and server to send data at any time.
D. WebSockets are a deprecated technology.
Show Answer
Report This Question
Answer: WebSockets provide full-duplex communication, allowing both the client and server to send data at any time.
133. Which Node.js module is commonly used for implementing WebSocket functionality in web applications?
A. express
B. http
C. ws
D. crypto
Show Answer
Report This Question
Answer: ws
134. What is the purpose of the ws module in Node.js?
A. To create HTML templates
B. To establish database connections
C. To provide a WebSocket server and client implementation
D. To handle routing
Show Answer
Report This Question
Answer: To provide a WebSocket server and client implementation
135. What is a WebSocket handshake in Node.js?
A. A process for establishing a secure connection using SSL/TLS
B. A process where the client and server exchange encryption keys
C. An initial HTTP request-response exchange to negotiate and establish a WebSocket connection
D. A process for user authentication
Show Answer
Report This Question
Answer: An initial HTTP request-response exchange to negotiate and establish a WebSocket connection
136. What is the WebSocket protocol identifier in a URL, often used for WebSocket connections in Node.js?
A. http://
B. ws://
C. tcp://
D. udp://
Show Answer
Report This Question
Answer: ws://
137. In Node.js Websockets, what is the purpose of the WebSocket object on the client-side?
A. To establish a connection to the database
B. To create a WebSocket server
C. To manage hardware devices
D. To communicate with the WebSocket server
Show Answer
Report This Question
Answer: To communicate with the WebSocket server
138. In Node.js WebSocket communication, how does the server send messages to connected clients?
A. By sending HTTP GET requests
B. By using the console.log() function
C. By calling the WebSocket.send() method on the client's WebSocket object
D. By sending email notifications
Show Answer
Report This Question
Answer: By calling the WebSocket.send() method on the client's WebSocket object
139. What is the purpose of the WebSocket.on('message') event in Node.js WebSocket communication?
A. To log errors
B. To close the WebSocket connection
C. To handle incoming messages from the WebSocket clients
D. To establish a secure connection
Show Answer
Report This Question
Answer: To handle incoming messages from the WebSocket clients
140. In Node.js, what is the typical way to broadcast a message to all connected WebSocket clients?
A. By sending individual messages to each client
B. By using the WebSocket.broadcast() method
C. By looping through all connected clients and sending the message to each one
D. By using HTTP requests
Show Answer
Report This Question
Answer: By looping through all connected clients and sending the message to each one
