To allow the on-premises environment to access the Azure SQL Database named SQL1 over a site-to-site (S2S) VPN in SubnetB, you shoulddeploy a private endpoint for SQL1. A private endpoint is a network interface that connects you privately and securely to a service powered by Azure Private Link. Private Link allows you to access Azure PaaS services (for example, Azure Storage and SQL Database) and Azure-hosted customer/partner services over a private endpoint in your virtual network. So the correct answer isD. Deploy a private endpoint for SQL1.

You can find more information about private endpoints in theofficial Microsoft documentation.

To resolve the issue where the application on VM1 is unable to send email to recipients outside the company, you should modify the NSG1 rule with a priority of 100 to allow outbound traffic on TCP port 587. The correct answer is therefore:

The proposed solution of configuring a route table with route propagation disabled will not meet the goal of making the new subnet unreachable from the on-premises network.

Route tables in Azure are used to control traffic flow within a virtual network and between virtual networks. By default, each subnet in an Azure virtual network is associated with a system-generated route table, which contains a default route that enables traffic to flow to and from all the subnets within the virtual network.

Disabling route propagation in a custom route table would prevent any new routes from being propagated to the associated subnets. However, it would not prevent traffic from the on-premises network from reaching the new subnet since traffic between the virtual network and the on-premises network would still use the default route in the system-generated route table.

To meet the goal of making the new subnet unreachable from the on-premises network, you would need to create a new route table with a route that sends traffic destined for the new subnet to a null interface. This would cause the traffic to be dropped and the subnet to be effectively unreachable from the on-premises network.

Microsoft documentation on how to create a custom route table and associate it with a subnet: https://docs.microsoft.com/en-us/azure/virtual-network/manage-route-table#create-a-custom-route-table.

Microsoft documentation on how to configure a route to a null interface: https://docs.microsoft.com/en-us/azure/virtual-network/tutorial-create-route-table-portal#to-route-to-a-null-interface.

To resolve the certificate mismatch error, you should reissue the client certificate with client authentication enabled.According to1, when you use Azure certificate for authentication type on point-to-site VPN connections, you need to ensure that your client certificates have client authentication as one of their enhanced key usage attributes. Otherwise, you will receive a certificate mismatch error when connecting by using a VPN client.

To resolve the certificate mismatch error, you should create a profile manually, add the server FQDN and reissue the client certificate.According to1, when you use OpenVPN for tunnel type on point-to-site VPN connections, you need to ensure that your client certificates have the correct server FQDN as one of their subject alternative names (SANs). Otherwise, you will receive a certificate mismatch error when connecting by using a VPN client.