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.
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 THREE commands can be used to verify IPv6 traffic filtering and uRPF operation on a Cisco IOS-XE router? (Choose THREE.)
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.
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
Verification commands for IPv6 filtering include 'show ipv6 interface' (displays access-group and uRPF status), 'show ipv6 access-list' (displays hit counts), and 'show ipv6 route' (checks FIB for uRPF). 'show ipv6 traffic' shows packet statistics but not filtering details. 'show ipv6 neighbors' shows ND cache, not filtering.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
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: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
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
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: show ipv6 interface — Verification commands for IPv6 filtering include 'show ipv6 interface' (displays access-group and uRPF status), 'show ipv6 access-list' (displays hit counts), and 'show ipv6 route' (checks FIB for uRPF). 'show ipv6 traffic' shows packet statistics but not filtering details. 'show ipv6 neighbors' shows ND cache, not filtering.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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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 uRPF status per interface, and show ipv6 cef detail reveals CEF forwarding details including RPF checks. show ipv6 access-list is for ACLs, not uRPF; show ipv6 route does not show uRPF; show ipv6 traffic shows packet statistics, not per-interface uRPF status.
Last reviewed: Jun 18, 2026
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