Azure App Service & Web Apps Flashcards

What is the purpose of enabling Always On for an Azure Web App?

Answer: Prevents the app from sleeping when idle

Always On keeps the app loaded so it does not unload after a period of inactivity, avoiding cold-start delays.

Which Azure App Service feature allows you to swap a staging slot to production with zero downtime?

Answer: Slot swap operation

The slot swap operation atomically routes traffic from staging to production, enabling zero-downtime deployments with instant rollback capability.

What does the ARR Affinity setting control in Azure App Service?

Answer: Session affinity routing to the same instance

ARR Affinity uses a cookie to route a client's requests to the same instance, maintaining session state in multi-instance deployments.

Which App Service configuration stores sensitive values that are exposed as environment variables and not visible in the portal after saving?

Answer: App settings (Key Vault references)

Key Vault references in App Service application settings allow sensitive values to be stored securely in Azure Key Vault and referenced without exposing the value.

How can you limit network access so that an Azure App Service web app only accepts traffic from an Azure Virtual Network?

Answer: Enable Private Endpoints for the web app

Private Endpoints assign a private IP from your VNet to the App Service, making it accessible only from within the VNet and blocking public internet access.

What is the function of VNet Integration in Azure App Service?

Answer: Allows the web app to make outbound calls into a VNet

VNet Integration enables outbound traffic from the App Service to reach resources inside an Azure Virtual Network, such as private databases.