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Ques:- What is the difference between User Identification and Authentication?
Right Answer:
User identification is the process of recognizing a user by their unique identifier, such as a username or ID. Authentication, on the other hand, is the process of verifying that the user is who they claim to be, typically through a password or other credentials.
Ques:- What is the difference between var let and const in JavaScript
Right Answer:
`var` is function-scoped or globally-scoped and can be re-declared and updated. `let` is block-scoped, can be updated but not re-declared in the same scope. `const` is also block-scoped, cannot be updated or re-declared, and must be initialized at the time of declaration.
Ques:- What is a single page application SPA
Right Answer:
A Single Page Application (SPA) is a web application that loads a single HTML page and dynamically updates the content as the user interacts with the app, without requiring a full page reload.
Ques:- What is AJAX and how does it work
Right Answer:
AJAX (Asynchronous JavaScript and XML) is a web development technique that allows web pages to communicate with a server and update content asynchronously without reloading the entire page. It works by using JavaScript to send requests to the server, which can return data (often in JSON or XML format) that the browser can then use to update the webpage dynamically.
Ques:- How does a web server handle an HTTP request
Right Answer:
A web server handles an HTTP request by following these steps:

1. **Receive Request**: The server listens for incoming HTTP requests on a specific port (usually port 80 for HTTP or port 443 for HTTPS).
2. **Parse Request**: It parses the request to extract the method (GET, POST, etc.), URL, headers, and body.
3. **Process Request**: The server determines how to respond based on the request. This may involve retrieving files, querying a database, or executing server-side scripts.
4. **Generate Response**: It creates an HTTP response, which includes a status code (like 200 for success), headers, and the requested content (like HTML, JSON, etc.).
5. **Send Response**: The server sends the response back to the client (usually a web browser) over the network.
6. **Log Request**: Optionally, the server logs the request details for monitoring and analysis.
Ques:- What is the difference between inline inline block and block elements
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>`).
Ques:- Tell about tomcat webser
Right Answer:
Tomcat is an open-source web server and servlet container developed by the Apache Software Foundation. It is used to run Java Servlets and JavaServer Pages (JSP), providing a platform for building and deploying web applications. Tomcat implements the Java EE specifications for servlets and JSP, allowing developers to create dynamic web content. It is lightweight, easy to configure, and widely used in the Java ecosystem.
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