You have a Windows App Service in West Europe that must access two back-end networks: (A) an Azure SQL Database private endpoint in a VNet also in West Europe, and (B) an application server in a VNet located in North Europe that can be reached only via that VNet’s VPN gateway. The app should not require inbound connectivity from those VNets. What VNet integration approach should you use for each back end?

For A, regional VNet Integration allows your App Service to access resources within the same region's VNet, like the Azure SQL Database private endpoint, without requiring a gateway. For B, since the application server is in a different region and accessible only via its VNet's VPN gateway, gateway-required VNet Integration is necessary. This enables the App Service to route traffic through the remote VNet's gateway. Private Endpoints on the App Service are for inbound access, not outbound to a private endpoint. ExpressRoute FastPath is for ExpressRoute, not VPN gateways. Using gateway-required VNet Integration for A is unnecessary as it's in the same region. Regional VNet Integration for B wouldn't work across regions to a gateway-protected resource without specific gateway integration. Service endpoints are for specific Azure services, not general VNet access, and Azure Firewall is not the primary solution for VNet integration.