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350-401 Practice Question: Drag and drop the steps of Unicast Reverse Path…
Drag and drop the steps of Unicast Reverse Path Forwarding (uRPF) check process into the correct order, from first to last.
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✓
Router receives packet on an interface
uRPF first receives a packet on an interface, then looks up the source IP in the routing table, verifies that the incoming interface matches the best reverse path, and if it matches, forwards the packet; otherwise, it drops the packet.
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Variation 1. Drag and drop the steps of Unicast Reverse Path Forwarding (uRPF) check process into the correct order, from first to last.
medium- A.Enable uRPF on the interface (strict or loose)
- ✓ B.Router receives packet on the interface
- ✓ C.Perform FIB lookup on source IP address
- ✓ D.Check if best reverse path uses same ingress interface
- ✓ E.Forward packet if valid or drop if spoofed
Why B: The Unicast Reverse Path Forwarding (uRPF) runtime check process begins after configuration. On receiving a packet (B), the router performs a FIB lookup on the source IP address (C). It then checks whether the best reverse path to that source uses the same ingress interface (D). If it does, the packet is forwarded; otherwise, it is dropped (E). Enabling uRPF (A) is a prerequisite configuration step, not a runtime check step.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.