Based on the exhibit, what is the first message with which Spoke 1 replies to the hub, instructing it to bring up the dynamic tunnel when a client generates traffic destined for Spoke 2? (Choose one answer.)
The ADVPN shortcut negotiation begins after traffic from Spoke 1 to Spoke 2 initially travels through the hub. When the hub detects that both spokes can establish a more direct connection, the hub—not Spoke 1—sends the first control message: a shortcut offer to Spoke 1.
The SD-WAN 7.6 Enterprise Administrator Study Guide then states: “Spoke 1 acknowledges the shortcut offer by sending a shortcut query to the hub.” Therefore, the first message that Spoke 1 sends in response is the shortcut query, making option A correct.
The hub subsequently forwards that query to Spoke 2. Spoke 2 responds with a shortcut reply, which the hub forwards back to Spoke 1. After Spoke 1 receives the reply containing the necessary peer information, Spoke 1 and Spoke 2 begin IKE negotiation and establish the dynamic spoke-to-spoke shortcut tunnel. Consequently, the shortcut reply occurs later and originates from Spoke 2, while the offer originates from the hub. “Shortcut forward” describes the hub’s forwarding action rather than Spoke 1’s first response. This behavior is part of Fortinet’s ADVPN shortcut architecture.
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