There are two modes of unicast RPF, strict mode, and loose mode. The default is strict mode, which means the switch forwards a packet only if the receiving interface is the best return path to the packet's unicast source address.
The other mode is loose mode, which means the system checks to see if the packet has a source address with a corresponding prefix in the routing table, but it does not check whether the receiving interface is the best return path to the packet's unicast source address.
--from: https://www.juniper.net/documentation/us/en/software/junos/vpn-l3/topics/topic-map/l3-vpns-unicast-reverse-path.html#:~:text=There%20are%20two%20modes%20of,the%20packet's%20unicast%20source%20address.
Correct answer
According to Voucher Assessment Test from Juniper.
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