Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 344

Unicast Reverse Path Forwarding (uRPF) has been configured on a service provider network to protect itself from spoofed based attacks. Which of the following are valid uRPF modes? (Choose two.)

Answer options

• A. Strict mode
• B. Open mode
• C. Closed mode
• D. Block mode
• E. Loose mode

Correct answer: A, E

Explanation

The correct answers are A (Strict mode) and E (Loose mode). Strict mode requires that the source address of the packet matches the routing table entry in a specific way, while loose mode allows more flexibility by only requiring that the source address is reachable. The other options (B, C, and D) are not recognized modes of uRPF.