The user's traffic originates from 10.0.1.10 (port3) and is destined for 10.200.3.1 (port1). The FortiGate evaluates firewall policies to find a match. The "WebServer" policy is disabled and therefore ignored. The second policy (ID 2) matches the traffic flow: incoming interface port3, outgoing interface port1, source all, destination all, and service ALL. This policy has NAT enabled and configured to "Use Outgoing Interface Address". The outgoing interface for this traffic is port1, which has the IP address 10.200.1.1. Therefore, the user's source IP (10.0.1.10) will be translated to 10.200.1.1.

A. 10.200.1.10 is the external IP of a VIP object used in a disabled policy for incoming traffic and is irrelevant to this outgoing traffic flow.

B. 10.0.1.254 is the IP address of the incoming interface (port3). Source NAT uses the outgoing interface address, not the incoming one.

D. 10.200.3.1 is the destination IP address of the traffic. The question asks for the source NAT address, not the destination.

1. FortiOS 7.2 Administration Guide, "Firewall policies". Fortinet Document Library, docs.fortinet.com. Accessed October 2023. The "NAT" subsection explains that when "Use Outgoing Interface Address" is selected, FortiOS uses the IP address of the interface that the traffic is leaving from as the source NAT address.

2. FortiOS 7.2 Cookbook, "Top-down processing of firewall policies". Fortinet Document Library, docs.fortinet.com. Accessed October 2023. This document confirms that policies are matched in order from top to bottom and that a disabled policy is skipped during evaluation.