- A
show ipv6 interface
Displays IPv6 interface configuration including uRPF status (e.g., 'ipv6 verify unicast source reachable-via any').
- B
show ipv6 cef detail
Shows CEF FIB entries with RPF information (e.g., 'RPF: Yes' or 'RPF: No').
- C
show ipv6 access-list
Why wrong: Displays IPv6 ACLs, not uRPF verification.
- D
show ipv6 route
Why wrong: Shows the IPv6 routing table, not uRPF status.
- E
show ipv6 traffic
Why wrong: Shows IPv6 traffic statistics, not per-interface uRPF state.
Question 667 of 2,152
300-410 IPv6 Traffic Filtering and uRPF Practice Question
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO commands can be used to verify IPv6 unicast RPF operation on an interface? (Choose TWO.)
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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').
Related concept
Read the scenario before looking for a memorised answer.
- ✓
show ipv6 cef detail
Why this is correct
Shows CEF FIB entries with RPF information (e.g., 'RPF: Yes' or 'RPF: No').
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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'.
Trap categories for this question
Command / output trap
Shows the IPv6 routing table, not uRPF status.
Detailed technical explanation
How to think about this question
IPv6 unicast RPF leverages the CEF FIB to verify that the source address of an incoming packet is reachable via the same interface it arrived on (strict mode) or via any interface (loose mode). The 'show ipv6 cef detail' command reveals the exact FIB entry used for the reverse lookup, including the output interface and next-hop, which is critical for troubleshooting uRPF failures in asymmetric routing scenarios. In real-world deployments, uRPF is often used on customer-facing interfaces to mitigate spoofed traffic, and verifying with these commands helps ensure that the FIB is populated correctly and that the interface is configured with the 'ipv6 verify unicast source reachable-via' command.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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