Which IP address will be used for source NAT when a user on Local-Client pings the IP address of Remote-FortiGate?

The source NAT (Network Address Translation) functionality is utilized to modify the source IP address of packets that are being sent from a local client when reaching out to a remote destination. In this scenario, when a user on Local-Client pings the IP address of Remote-FortiGate, the source NAT will be determined based on the configurations applied to the FortiGate firewall.

The correct choice, 10.200.1.99, is typically designated for NAT operations and is likely assigned to the internal interface of the FortiGate that handles traffic from the Local-Client. This address is used to ensure that outbound packets have a consistent, routable address when communicating with external devices, such as the Remote-FortiGate in this case.

The other options may represent various other IP addresses configured in the network, possibly indicating different interfaces, subnets, or addresses not specifically designated for NATing local traffic destined for the remote site. Consequently, they wouldn't be used for source NAT in this particular scenario as they don’t align with the interface or setup that manages the traffic from the Local-Client to the Remote-FortiGate.