What is the result of a successful RFP check?

Question

Options

• AThe packet is dropped because it arrived on the interface used to route traffic back to the
• BThe packet is forwarded because it arrived on the interface used to route traffic back to the
• CThe packet is forwarded because it arrived on the interface used to route traffic to the
• DThe packet is dropped because it arrived on the interface used to route traffic to the

• A
  8% (5)
• B
  87% (53)
• C
  3% (2)
• D
  2% (1)

Explanation

This question refers to RPF (Reverse Path Forwarding), a spoofing-prevention mechanism. An RPF check examines whether an incoming packet arrived on the interface that the router would use to route traffic back to the packet's source IP address. A successful RPF check means the packet did arrive on the expected (correct) interface, indicating the source address is reachable via that interface and is likely not spoofed. The result is that the packet is forwarded. A failed RPF check (packet arrived on the wrong interface) results in the packet being dropped as a potential spoofed or asymmetrically routed packet. Option B correctly states the packet is forwarded because it arrived on the interface used to route back to the source.

No community discussion yet for this question.