Which condition can cause unicast reverse path forwarding to fail?
正解:C
Explanation/Reference: Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network. https://www.cisco.com/c/en/us/about/security-center/unicast-reverse-path-forwarding.html