Exam NSE4_FGT_AD-7.6 Topic 2 Question 21 Discussion
Actual exam question for Fortinet's NSE4_FGT_AD-7.6 exam
Question #: 21
Topic #: 2
Question #: 21
Topic #: 2
Refer to the exhibits.
A diagram of a FortiGate device connected to the network VIP object and firewall policy configurations are shown.
The WAN (port2) interface has the IP address
100.65.0.101/24.
The LAN (port4) interface has the IP address
10.0.11.254/24.
If the host 100.65.1.111 sends a TCP SYN packet on port 443 to 100.65.0.200. what will the source address, destination address, and destination port of the packet be at the time FortiGate forwards the packet to the destination?
A diagram of a FortiGate device connected to the network VIP object and firewall policy configurations are shown.
The WAN (port2) interface has the IP address
100.65.0.101/24.
The LAN (port4) interface has the IP address
10.0.11.254/24.
If the host 100.65.1.111 sends a TCP SYN packet on port 443 to 100.65.0.200. what will the source address, destination address, and destination port of the packet be at the time FortiGate forwards the packet to the destination?
Suggested Answer: C Vote an answer
From the exhibits:
A VIP named VIP-WEB-SERVER is configured on WAN (port2) with:
External IP: 100.65.0.200
Mapped (internal) IP: 10.0.11.50
Port forwarding enabled (TCP)
External service port: 443
Map to IPv4 port: 4443
The inbound firewall policy Web_Server_Access is:
From WAN (port2) to LAN (port4)
Destination: VIP-WEB-SERVER
Service: HTTPS
NAT: Disabled (meaning no source NAT is applied)
What happens to the packet
A host 100.65.1.111 sends TCP SYN dst-port 443 to 100.65.0.200.
When FortiGate matches the VIP and forwards traffic to the internal server, FortiGate performs destination NAT (DNAT) based on the VIP:
Source IP is unchanged because policy NAT is disabled:
Source remains 100.65.1.111
Destination IP is translated by the VIP:
Destination becomes 10.0.11.50
Destination port is translated by the VIP port-forward:
Destination port becomes 4443
Therefore, at the time FortiGate forwards the packet to the destination (internal server), it will be:
Source address: 100.65.1.111
Destination address: 10.0.11.50
Destination port: 4443
A VIP named VIP-WEB-SERVER is configured on WAN (port2) with:
External IP: 100.65.0.200
Mapped (internal) IP: 10.0.11.50
Port forwarding enabled (TCP)
External service port: 443
Map to IPv4 port: 4443
The inbound firewall policy Web_Server_Access is:
From WAN (port2) to LAN (port4)
Destination: VIP-WEB-SERVER
Service: HTTPS
NAT: Disabled (meaning no source NAT is applied)
What happens to the packet
A host 100.65.1.111 sends TCP SYN dst-port 443 to 100.65.0.200.
When FortiGate matches the VIP and forwards traffic to the internal server, FortiGate performs destination NAT (DNAT) based on the VIP:
Source IP is unchanged because policy NAT is disabled:
Source remains 100.65.1.111
Destination IP is translated by the VIP:
Destination becomes 10.0.11.50
Destination port is translated by the VIP port-forward:
Destination port becomes 4443
Therefore, at the time FortiGate forwards the packet to the destination (internal server), it will be:
Source address: 100.65.1.111
Destination address: 10.0.11.50
Destination port: 4443
by Blithe at Aug 25, 2026, 09:58 PM
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