Refer to the exhibit. R1 is connected to two service providers and is under a DDoS attack. Which statement about this design is true if URPF in strict mode is configured on both interfaces?
A) R1 drops all traffic that ingresses either interface that has a FIB entry that exits a different interface.
B) R1 drops destination addresses that are routed to a null interface on the router.
C) R1 permits asymmetric routing as long as the AS-PATH attribute entry matches the connected AS.
D) R1 accepts source addresses on interface gigabitethernet0/1 that are private addresses.

Question

Refer to the exhibit. R1 is connected to two service providers and is under a DDoS attack. Which statement about this design is true if URPF in strict mode is configured on both interfaces?
A) R1 drops all traffic that ingresses either interface that has a FIB entry that exits a different interface. 
B) R1 drops destination addresses that are routed to a null interface on the router. 
C) R1 permits asymmetric routing as long as the AS-PATH attribute entry matches the connected AS. 
D) R1 accepts source addresses on interface gigabitethernet0/1 that are private addresses.

Quizplus · Accepted Answer

The Answer of  Refer to the exhibit. R1 is connected to two service providers and is under a DDoS attack. Which statement about this design is true if URPF in strict mode is configured on both interfaces?
A) R1 drops all traffic that ingresses either interface that has a FIB entry that exits a different interface. 
B) R1 drops destination addresses that are routed to a null interface on the router. 
C) R1 permits asymmetric routing as long as the AS-PATH attribute entry matches the connected AS. 
D) R1 accepts source addresses on interface gigabitethernet0/1 that are private addresses.

Refer to the Exhibit