You have a public load balancer that balances ports 80 and 443 across three virtual machines named VM1, VM2, and VM3. You need to direct all the Remote Desktop Protocol (RDP) connections to VM3 only. What should you configure?
The difference between inbound NAT rules and port mapping in load balancer rules is that inbound NAT rules apply to direct forwarding to a VM, whereas load balancer rules forward traffic to a backend pool.
Don't confuse public load balancer with Application load balancer. Public load balancers do not have load balancing rules based on layer 7 traffic. Hence the NAT rule...
A. an inbound NAT rule.
To direct all RDP connections to VM3 only, you need to create an inbound NAT rule that maps the RDP port (3389) to the RDP port of VM3. You can do this by specifying the frontend IP configuration of the public load balancer, the protocol (TCP), the frontend port (3389), and the backend port (3389) of VM3 in the inbound NAT rule. This will route all incoming RDP traffic to VM3 only, regardless of the load balancing configuration.
A is correct .... An inbound NAT rule forwards incoming traffic sent to frontend IP address and port combination. The traffic is sent to a specific virtual machine or instance in the backend pool.
https://docs.microsoft.com/en-us/azure/load-balancer/components
Correct.
Inbound Network Address Translation (NAT) rules are an optional setting in Azure Load Balancer. These rules essentially create another port mapping from the frontend to the backend, forwarding traffic from a specific port on the frontend to a specific port in the backend.
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