Fortinet FCSS_EFW_AD-7.6 Question Answer
Refer to the exhibit, which shows an ADVPN network.

The client behind Spoke-1 generates traffic to the device located behind Spoke-2.
What is the first message that the hub sends to Spoke-1 to bring up the dynamic tunnel?

A client behind Spoke-1 sends traffic to a device behind Spoke-2.
The traffic initially flows through the hub, following the pre-established overlay tunnel.
The hub detects that Spoke-1 is communicating with Spoke-2 and determines that a direct shortcut tunnel between the spokes can optimize the connection.
The hub sends a "Shortcut Offer" message to Spoke-1, informing it that a direct dynamic tunnel to Spoke-2 is possible.
Spoke-1 and Spoke-2 then negotiate and establish a direct IPsec tunnel for communication.