• Scenario: How would you design and implement auditing for authentication events (logins, logouts, failures) and significant authorization decisions within your ASP.NET Core application hosted on Azure ?

  • Scenario: You need to implementtwo-factor authentication (2FA/MFA)for users logging into yourASP.NET Core applicationusingASP.NET Core Identity. Outline the steps. Expertise Level: Mid-Level

  • Discuss the implementation of a "Remember Me" functionality securely using ASP.NET Core Identity .

  • Scenario: You are designing a microservices architecture in Azure. How would you handle authentication and authorization propagation between services when a user request flows through multiple ASP.NET Core APIs ?

  • Scenario:Describe how you would use Azure Key Vault and Managed Identity together to secure access tothird-party API keysneeded by your ASP.NET Core Web API running in Azure App Service .

  • Scenario:How do you ensuresecrets used for signing JWTs(if not using an external IdP like Azure AD) aresecurely managed and rotatedfor yourASP.NET Core Web API?

  • Scenario: You need to implement rate limiting for authenticated users accessing your ASP.NET Core Web API hosted in Azure . How would you approach this?

  • Scenario: How would you implementfine-grained, resource-based authorizationin anASP.NET Core Web API? For example, ensuring a user can only editdocuments they own.

  • Scenario: Users are reporting being frequently logged out or receiving 401 errors from your ASP.NET Core Web API. Outline the steps you would take to troubleshoot potential authentication or token validation issues.

  • Scenario: You need to migrate an older ASP.NET application using Forms Authentication to ASP.NET Core Identity or Azure AD. What are the key challenges and steps involved?

  • Design an authorization system for a multi-tenant SaaS application built withASP.NET Coreand hosted onAzure, where users have different permissions based on theirtenantand theirrolewithin that tenant.

  • Scenario:You have anASP.NET Core Web APIconsumed by both aweb application(usingAuthorization Code flow) and abackground service(usingClient Credentials flow). How would you configureauthenticationandauthorizationto support both client types securely?

  • Explain how Azure AD Conditional Access policies can be used to enforce security requirements (like MFA, device compliance, location restrictions) for accessing Azure applications or ASP.NET Core APIs secured by Azure AD.

  • How do you securely store sensitive configuration data (like database connection strings, API keys, client secrets) for an ASP.NET Core application deployed to Azure?

  • What measures should you take to protect against Cross-Site Scripting (XSS) attacks related to user input or data displayed after authentication/authorization ?

  • How can you prevent Cross-Site Request Forgery (CSRF) attacks in ASP.NET Core applications, especially when using cookie-based authentication ? Is it relevant for token-based API authentication ?

  • What isCross-Origin Resource Sharing (CORS), and why is it often necessary to configure it forASP.NET Core Web APIs? How do you configure CORS policies securely?

  • How would you secure anASP.NET Core Web APIusingAPI Keys? What are thesecurity considerationsandlimitationsof this approach?

  • Differentiate between System-Assigned and User-Assigned Managed Identities in Azure.

  • Explain how Managed Identities in Azure can be used for authentication between Azure services (e.g., an App Service calling Azure Key Vault or Azure SQL) without managing credentials in your code.

  • How do you configure an ASP.NET Core application to use an external OpenID Connect provider (like Azure AD or Google) for user authentication?

  • What is OpenID Connect (OIDC) ? How does it extend OAuth 2.0 , and what primary problem does it solve?

  • Explain the OAuth 2.0 Client Credentials Grant flow. When is it appropriate to use this flow for securing communication, for example, between microservices in Azure? Expertise Level: Mid Level

  • Describe the OAuth 2.0 Authorization Code Grant flow . When is it typically used in web applications interacting with APIs ?

  • How would you implement Claims-Based Authorization in an ASP.NET Core Web API?