Right Answer: A Cross Join is a type of SQL join that returns the Cartesian product of two tables, meaning it combines every row from the first table with every row from the second table, resulting in a total number of rows equal to the product of the number of rows in both tables.
Right Answer: The different types of telecommunications networks include:
1. **Public Switched Telephone Network (PSTN)** - Traditional landline networks.
2. **Mobile Networks** - Cellular networks for mobile phones (e.g., 3G, 4G, 5G).
3. **Satellite Networks** - Communication via satellites in orbit.
4. **Optical Fiber Networks** - High-speed data transmission using fiber optics.
5. **Wireless Local Area Networks (WLAN)** - Local networks using wireless technology (e.g., Wi-Fi).
6. **Wide Area Networks (WAN)** - Networks that cover large geographical areas.
7. **Local Area Networks (LAN)** - Networks that cover a small geographical area, like a home or office.
8. **Virtual Private Networks (VPN)** - Secure connections over the internet for private communication.
Right Answer: Promises in JavaScript are objects that represent the eventual completion (or failure) of an asynchronous operation and its resulting value. They allow you to handle asynchronous code more easily by providing methods like `.then()` for success and `.catch()` for errors.
`async` and `await` are syntactic sugar built on top of promises. An `async` function always returns a promise, and within an `async` function, you can use `await` to pause execution until a promise is resolved, making the code easier to read and write as if it were synchronous.
Right Answer: JavaScript is a programming language used to create interactive and dynamic content on websites. It allows developers to manipulate HTML and CSS, handle events, and communicate with servers, enhancing user experience and functionality in web development.
Right Answer: Responsive design is an approach to web development that ensures a website looks and functions well on various devices and screen sizes. It is implemented using flexible grid layouts, fluid images, and CSS media queries to adapt the layout and content based on the device's screen size and orientation.
Right Answer: Block elements take up the full width available and start on a new line (e.g., `<div>`, `<h1>`). Inline elements only take up as much width as necessary and do not start on a new line (e.g., `<span>`, `<a>`). Inline-block elements are similar to inline elements but can have width and height set, and they respect margins and padding (e.g., `<img>`, `<button>`).
