Q1: How would you implement authentication in an ASP.NET Core application?
Answer:
Authentication in ASP.NET Core can be implemented using various methods like cookies, JWT, or third-party providers (e.g., Google, Facebook). The typical approach is to use ASP.NET Core Identity for user management. You can also configure JWT authentication by using the AddJwtBearer() method in Startup.cs for API-based applications.
Q2: What is the role of Identity in ASP.NET Core for authentication and authorization?
Answer:
ASP.NET Core Identity provides a framework for managing user authentication and authorization. It includes features like password hashing, user roles, and claims-based authentication. It integrates seamlessly with ASP.NET Core and allows for easy setup of user login, registration, and role-based access.
Q3: Explain the concept of JWT (JSON Web Token) and how to implement it in .NET Core.
Answer:
JWT is a compact, URL-safe token format used for securely transmitting information between client and server. In ASP.NET Core, you can implement JWT authentication by configuring the AddJwtBearer() middleware in Startup.cs. The server generates a token containing claims and sends it to the client, which includes it in the Authorization header for subsequent requests.
Q4: What are the best practices for securing an ASP.NET Core application?
Answer:
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Use HTTPS to ensure secure communication.
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Implement proper user authentication and authorization.
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Use data protection APIs for sensitive data storage.
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Keep dependencies up to date and use security patches.
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Secure API endpoints with rate limiting and logging.
Q5: How do you prevent Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) attacks in ASP.NET Core?
Answer:
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XSS: Use Razor syntax for HTML rendering, which automatically encodes