You need to ensure that users can access VM0. The solution must meet the platform protection requirements. What should you do?

The platform protection requirements mandate that traffic to internal resources like VM0 must be inspected by the Azure Firewall. To enable external users to access a service on VM0 through the firewall, a Destination Network Address Translation (DNAT) rule is the correct mechanism. A DNAT rule on the Azure Firewall translates inbound traffic destined for the firewall's public IP address and a specific port to the private IP address and port of VM0. This allows the firewall to receive, inspect, and forward the traffic securely to the intended virtual machine, thereby meeting the security requirements.

A. Moving the VM to another subnet does not configure the firewall to allow inbound traffic to it; it only changes its network location.

B. Network traffic filtering rules are typically used for outbound or east-west traffic, not for translating inbound internet traffic to a specific internal host.

C. The dedicated AzureFirewallSubnet is managed by the Azure platform, and associating a user-defined route table (UDR) with it is not permitted.

1. Microsoft Learn | Azure Firewall Documentation | Tutorial: Filter inbound network traffic with Azure Firewall DNAT using the Azure portal: In the introduction

it states

"To configure inbound connectivity

you configure Destination Network Address Translation (DNAT) as described in this article. DNAT rules translate and filter inbound Internet traffic to your subnets." This directly supports the use of a DNAT rule for inbound access.

2. Microsoft Learn | Azure Firewall Documentation | Azure Firewall rule processing logic: Under the "Inbound connectivity" section

the documentation explicitly states

"Inbound Internet connectivity can be enabled by configuring Destination Network Address Translation (DNAT) as described in Tutorial: Filter inbound traffic with Azure Firewall DNAT using the Azure portal." This confirms DNAT is the intended feature for this scenario.

3. Microsoft Learn | Azure Firewall Documentation | Azure Firewall FAQ: In the "Configuration" section

the question "Can I associate a UDR to the AzureFirewallSubnet?" is answered with "No. You can't associate a UDR to the AzureFirewallSubnet." This directly invalidates option C.