DRAG DROP - Drag the properties from the left onto their corresponding Unicast Reverse Path Forwarding mode on the right. Not all properties are used. Select and Place:
Yes: strict mode for inside interface, loose mode + default route for outside.
"Administrators should use Unicast RPF in strict mode on network interfaces for which all packets received on an interface are guaranteed to originate from the subnet assigned to the interface. A subnet composed of end stations or network resources fulfills this requirement. Such a design would be in place for an access layer network or a branch office where there is only one path into and out of the branch network. No other traffic originating from the subnet is allowed and no other routes are available past the subnet.
Unicast RPF loose mode can be used on an uplink network interface that has a default route associated with it."
https://tools.cisco.com/security/center/resources/unicast_reverse_path_forwarding
Strict Mode
- Source packet must be received on the interface that will foward the return traffic
- Configure on internet router inside interface
Loose Mode
- Source address must appear in routing table
- Configured on internet router outside interfaces
- Default route can be us
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