Which uRPF mode allows packets to pass if any route exists to the source, regardless of interface?
- VRF mode
- Feasible-paths mode
- Strict mode
- Loose mode
Explanation: According to the sources, Unicast Reverse Path Forwarding (uRPF) in Loose mode is designed to validate the existence of a source network in the routing table without restricting it to a specific interface,.
Unlike Strict mode, which requires a packet to be received on the "expected interface" (the same one the router would use to reach that source), Loose mode allows a packet to pass as long as its source IP address has a corresponding entry in the Forwarding Information Base (FIB),.
This behavior is specifically described as being "reachable-via any," making it a scalable option for environments with asymmetric routing, where valid packets may legitimately arrive on an interface different from the outbound path,.
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