Exam NSE4_FGT-7.0 topic 1 question 13 discussion

BD for sure

Reference and download study guide: https://ebin.pub/fortinet-fortigate-infrastructure-study-guide-for-fortios-72.html

BD, lower distance & enable DPD

BD - DPD enabled and lower distance is prefered

Study Guide – IPsec VPN – IPsec configuration – Phase 1 Network. When Dead Peer Detection (DPD) is enabled, DPD probes are sent to detect a failed tunnel and bring it down before its IPsec SAs expire. This failure detection mechanism is very useful when you have redundant paths to the same destination, and you want to failover to a backup connection when the primary connection fails to keep the connectivity between the sites up. There are three DPD modes. On demand is the default mode. Study Guide – IPsec VPN – Redundant VPNs. Add one phase 1 configuration for each tunnel. DPD should be enabled on both ends. Add at least one phase 2 definition for each phase 1. Add one static route for each path. Use distance or priority to select primary routes over backup routes (routes for the primary VPN must have a lower distance or lower priority than the backup). Alternatively, use dynamic routing. Configure FW policies for each IPsec interface.