- A
show ipv6 interface
Correct. This command shows whether an IPv6 access-group or uRPF is applied on the interface, including packet statistics.
- B
show ipv6 access-list
Correct. Displays the configured IPv6 access-lists with hit counts, useful for verifying if traffic is being matched.
- C
show ipv6 route
Correct. uRPF uses the FIB, and 'show ipv6 route' shows the routing table entries needed for uRPF verification.
- D
show ipv6 traffic
Why wrong: Incorrect. This command shows aggregate IPv6 packet statistics (e.g., total packets sent/received), not per-interface filtering or uRPF status.
- E
show ipv6 neighbors
Why wrong: Incorrect. This shows the IPv6 neighbor discovery cache (MAC addresses), not related to traffic filtering or uRPF.
Question 904 of 2,152
IPv6 uRPF Verification Commands — show ipv6 interface, access-list, route
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 THREE commands can be used to verify IPv6 traffic filtering and uRPF operation on a Cisco IOS-XE router? (Choose THREE.)
Quick Answer
The answer is show ipv6 interface, show ipv6 access-list, and show ipv6 route. These three commands are correct because they directly verify the two key components of IPv6 uRPF operation: the interface-level uRPF and access-group status, the access-list hit counts that track filtering matches, and the FIB entries in the routing table that uRPF uses to validate source addresses. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish between verification commands that reveal filtering details versus those that show only traffic statistics or neighbor cache data. A common trap is choosing show ipv6 traffic, which displays packet counters but not per-interface uRPF or ACL status, or show ipv6 neighbors, which is unrelated to filtering. For a quick memory tip, remember the acronym IAR: Interface, Access-list, Route — the three places uRPF and filtering are verified.
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 interface configurations, including whether IPv6 unicast reverse path forwarding (uRPF) is enabled and its strict or loose mode. It also shows access-group information for IPv6 traffic filtering applied to the interface, making it essential for verifying both uRPF and ACL application.
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
Correct. This command shows whether an IPv6 access-group or uRPF is applied on the interface, including packet statistics.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
show ipv6 access-list
Why this is correct
Correct. Displays the configured IPv6 access-lists with hit counts, useful for verifying if traffic is being matched.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
show ipv6 route
Why this is correct
Correct. uRPF uses the FIB, and 'show ipv6 route' shows the routing table entries needed for uRPF verification.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
show ipv6 traffic
Why it's wrong here
Incorrect. This command shows aggregate IPv6 packet statistics (e.g., total packets sent/received), not per-interface filtering or uRPF status.
- ✗
show ipv6 neighbors
Why it's wrong here
Incorrect. This shows the IPv6 neighbor discovery cache (MAC addresses), not related to traffic filtering or uRPF.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between commands that show configuration/status (like 'show ipv6 interface') versus those that show operational statistics or neighbor tables, leading candidates to mistakenly select 'show ipv6 traffic' or 'show ipv6 neighbors' for verification tasks.
Trap categories for this question
Command / output trap
Incorrect. This command shows aggregate IPv6 packet statistics (e.g., total packets sent/received), not per-interface filtering or uRPF status.
Detailed technical explanation
How to think about this question
IPv6 uRPF relies on the Forwarding Information Base (FIB) to verify that the source address of incoming packets is reachable via the incoming interface (strict mode) or at least via any interface (loose mode). The 'show ipv6 interface' command reveals the uRPF mode and any applied IPv6 access-list, while 'show ipv6 access-list' shows the exact permit/deny entries and hit counts, and 'show ipv6 route' confirms the routing table entries used by uRPF for source reachability checks.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Visual reference
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 interface configurations, including whether IPv6 unicast reverse path forwarding (uRPF) is enabled and its strict or loose mode. It also shows access-group information for IPv6 traffic filtering applied to the interface, making it essential for verifying both uRPF and ACL application.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO commands can be used to verify IPv6 unicast RPF operation on an interface? (Choose TWO.)
medium- ✓ A.show ipv6 interface
- ✓ B.show ipv6 cef detail
- C.show ipv6 access-list
- D.show ipv6 route
- E.show ipv6 traffic
Why A: 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.
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Last reviewed: Jul 4, 2026
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