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300-410 Practice Question: Which TWO commands can be used to verify IPv6…
Which TWO commands can be used to verify IPv6 unicast RPF operation on an interface? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the misconception that 'show ipv6 route' is sufficient for uRPF verification, but uRPF uses the CEF FIB (not the routing table) for its reverse path lookup, making 'show ipv6 cef detail' the correct command alongside 'show ipv6 interface'.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show ipv6 interface
The 'show ipv6 interface' command displays IPv6 unicast RPF (uRPF) configuration and operational status per interface, including whether strict or loose mode is enabled and any drop counts. The 'show ipv6 cef detail' command verifies the Forwarding Information Base (FIB) entries used by uRPF to perform the reverse path lookup, confirming that the source address of incoming packets matches a valid return route in the CEF table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show ipv6 interface
Why this is correct
Displays IPv6 interface configuration including uRPF status (e.g., 'ipv6 verify unicast source reachable-via any').
- ✓
show ipv6 cef detail
Why this is correct
Shows CEF FIB entries with RPF information (e.g., 'RPF: Yes' or 'RPF: No').
- ✗
show ipv6 access-list
Why it's wrong here
Displays IPv6 ACLs, not uRPF verification.
- ✗
show ipv6 route
Why it's wrong here
Shows the IPv6 routing table, not uRPF status.
- ✗
show ipv6 traffic
Why it's wrong here
Shows IPv6 traffic statistics, not per-interface uRPF state.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.