Exam NSE7_FSN_AR-7.6 Topic 1 Question 81 Discussion

The correct answers are A, D, and E. This is a feasible path RPF check scenario. In FortiGate's default RPF behavior, FortiGate checks whether the routing table contains a valid return route to the source IP address through the same interface on which the packet arrived. The study guide's RPF feasible path example states that FortiGate "checks the routing table for a route that matches the source address and incoming interface of the first original packet." It then gives the exact result: User A passes because "there is a default route through wan1," so packets received on wan1 pass the RPF check regardless of source address. User B fails because FortiGate does not have a route to 95.56.234.24 through wan2. User C fails because FortiGate does not have a route to 10.0.4.63 through port1. Therefore, option B is wrong because FortiGate is not allowing asymmetric return routing here. Option C is wrong because the default route points out wan1, not port1, so it cannot validate User C's packet arriving on port1.