The answer is show ipv6 source-guard, show ipv6 neighbors, and show ipv6 dhcp snooping binding. These three commands directly verify IPv6 First Hop Security (FHS) bindings because each targets a distinct FHS component: the source guard policy and its drop statistics, the neighbor discovery cache that stores ND-snooped entries, and the DHCPv6 snooping database that tracks lease-based bindings. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish FHS verification tools from general IPv6 troubleshooting commands; a common trap is selecting show ipv6 route or show ipv6 traffic, which show routing tables and packet counters respectively, not FHS-specific bindings. When you need to verify IPv6 FHS bindings, remember the three pillars of FHS verification: neighbors for ND, DHCP snooping for leases, and source-guard for enforcement. A useful memory tip is “ND, DHCP, SG” — think of them as the three legs of the FHS stool.
300-410 IPv6 First Hop Security Practice Question
This 300-410 practice question tests your understanding of ipv6 first hop security. 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 First Hop Security (FHS) bindings or operations? (Choose THREE.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show ipv6 neighbors
Various show commands are used to verify FHS features. 'show ipv6 neighbors' displays the ND cache, which includes bindings learned via ND snooping. 'show ipv6 dhcp snooping binding' displays DHCPv6 snooping bindings. 'show ipv6 source-guard' shows Source Guard policy and statistics. Option A is correct: 'show ipv6 neighbors' shows ND entries that FHS uses. Option B is correct: 'show ipv6 dhcp snooping binding' shows DHCPv6 bindings used by Source Guard. Option D is correct: 'show ipv6 source-guard' displays Source Guard configuration and drops. Option C is incorrect: 'show ipv6 route' shows routing table, not FHS bindings. Option E is incorrect: 'show ipv6 traffic' shows packet statistics, not FHS-specific bindings.
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 neighbors
Why this is correct
Correct. This command displays the IPv6 neighbor discovery cache, which includes bindings used by FHS features like ND inspection.
Clue confirmation
The clue word "first" in the question point toward this answer.
Incorrect. This command shows IPv6 traffic statistics, not FHS-specific binding information.
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 the IPv6 routing table, not FHS bindings.
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 First Hop Security — This question tests IPv6 First Hop Security — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: show ipv6 neighbors — Various show commands are used to verify FHS features. 'show ipv6 neighbors' displays the ND cache, which includes bindings learned via ND snooping. 'show ipv6 dhcp snooping binding' displays DHCPv6 snooping bindings. 'show ipv6 source-guard' shows Source Guard policy and statistics. Option A is correct: 'show ipv6 neighbors' shows ND entries that FHS uses. Option B is correct: 'show ipv6 dhcp snooping binding' shows DHCPv6 bindings used by Source Guard. Option D is correct: 'show ipv6 source-guard' displays Source Guard configuration and drops. Option C is incorrect: 'show ipv6 route' shows routing table, not FHS bindings. Option E is incorrect: 'show ipv6 traffic' shows packet statistics, not FHS-specific bindings.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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