Refer to the exhibits.

Vendor: Fortinet
Product: FCSS_EFW_AD-7.6
Update on: Sep 3, 2025
Questions: 57

Fortinet FCSS_EFW_AD-7.6 Question Answer

The configuration of a user's Windows PC, which has a default MTU of 1500 bytes, along with FortiGate interfaces set to an MTU of 1000 bytes, and the results of PC1 pinging server 172.16.0.254 are shown.

Why is the user in Windows PC1 unable to ping server 172.16.0.254 and is seeing the message: Packet needs to be fragmented but DF set?

Option ip.flags.mf must be set to enable on FortiGate. The user has to adjust the ping MTU to 1000 to succeed.

Fragmented packets must be encrypted. To connect any application successfully, the user must install the Fortinet_CA certificate in the Microsoft Management Console.

FortiGate honors the do not fragment bit and the packets are dropped. The user has to adjust the ping MTU to 972 to succeed.

The user must trigger different traffic because path MTU discovery techniques do not recognize ICMP payloads.