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Fortinet Certified Professional: FortiGate / FortiOS 7.6 Administrator · Fortinet
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C. On Idle FortiGate Infrastructure 7.2 Study Guide (p.256): "On Idle: FortiGate sends DPD probes when no traffic is observed in the tunnel." Reference and download study guide: https://ebin.pub/fortinet-fortigate-infrastructure-study-guide-for-fortios-72.html
correct answer is C.
On Idle: FortiGate sends DPD probes when no traffic is observed in the tunnel. An idle tunnel does not necessarily mean the tunnel is dead. Avoid this mode if you have many tunnels, because the overhead introduced by DPD can be very resource intensive.