Question 674 of 2,152

IPv6 First Hop Security →hardMultiple SelectObjective-mapped

Verifying IPv6 FHS Bindings — Show Commands Explained | Cisco CCNP ENARSI 300-410

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.

A
show ipv6 neighbors
Correct. This command displays the IPv6 neighbor discovery cache, which includes bindings used by FHS features like ND inspection.
B
show ipv6 dhcp snooping binding
Correct. This command shows DHCPv6 snooping bindings that are used by IPv6 Source Guard.
C
show ipv6 route
Why wrong: Incorrect. This command shows the IPv6 routing table, not FHS bindings.
D
show ipv6 source-guard
Correct. This command displays Source Guard policy and statistics, including dropped packets.
E
show ipv6 traffic
Why wrong: Incorrect. This command shows IPv6 traffic statistics, not FHS-specific binding information.

Full breakdown with real-world context →

Quick Answer

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.

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 neighbors

Option A is correct because the 'show ipv6 neighbors' command displays the IPv6 neighbor cache, which is populated by the Neighbor Discovery Protocol (NDP). In IPv6 FHS, this cache is used to verify bindings between IPv6 addresses and MAC addresses, and it is directly affected by features like RA Guard and ND Inspection, which monitor and filter NDP messages to ensure only legitimate neighbors are learned.

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 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.
Related concept
Read the scenario before looking for a memorised answer.
✓
show ipv6 dhcp snooping binding
Why this is correct
Correct. This command shows DHCPv6 snooping bindings that are used by IPv6 Source Guard.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
show ipv6 route
Why it's wrong here
Incorrect. This command shows the IPv6 routing table, not FHS bindings.
✓
show ipv6 source-guard
Why this is correct
Correct. This command displays Source Guard policy and statistics, including dropped packets.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
show ipv6 traffic
Why it's wrong here
Incorrect. This command shows IPv6 traffic statistics, not FHS-specific binding information.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between control-plane verification commands (like 'show ipv6 neighbors' for ND-based bindings) and data-plane or routing commands (like 'show ipv6 route'), leading candidates to mistakenly select routing or traffic statistics commands that do not reveal FHS-specific binding or operational state.

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

IPv6 FHS encompasses features like RA Guard, DHCPv6 Guard, ND Inspection, and Source Guard, all of which rely on binding tables. The 'show ipv6 dhcp snooping binding' command (Option B) reveals the DHCPv6 lease database, which is critical for DHCPv6 Guard to validate server and client messages. The 'show ipv6 source-guard' command (Option D) displays the policy and active bindings used to filter traffic based on source IPv6 addresses, preventing spoofing attacks. Under the hood, these bindings are stored in a common binding table that can be populated by ND Inspection or DHCPv6 snooping, and they are referenced by Source Guard to enforce per-port filtering.

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.

Quick reference

Access Control Model Comparison

Model	Acronym	Who Controls Access?	Best For
Discretionary Access Control	DAC	Resource owner	Small teams, file shares
Mandatory Access Control	MAC	System / security labels	Classified govt / military
Role-Based Access Control	RBAC	Administrator (via roles)	Enterprise environments
Attribute-Based Access Control	ABAC	Policy engine (user + resource attributes)	Fine-grained, dynamic policies
Rule-Based Access Control	RuBAC	System rules / ACLs	Firewall rules, network ACLs

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Related 300-410 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Layer 3 Technologies practice questions

Practise 300-410 questions linked to Layer 3 Technologies.

EIGRP Troubleshooting practice questions

Practise 300-410 questions linked to EIGRP Troubleshooting.

OSPF Troubleshooting (v2/v3) practice questions

Practise 300-410 questions linked to OSPF Troubleshooting (v2/v3).

BGP Troubleshooting practice questions

Practise 300-410 questions linked to BGP Troubleshooting.

Route Redistribution practice questions

Practise 300-410 questions linked to Route Redistribution.

Policy-Based Routing (PBR) practice questions

Practise 300-410 questions linked to Policy-Based Routing (PBR).

VRF-Lite practice questions

Practise 300-410 questions linked to VRF-Lite.

Route Maps and Route Filtering practice questions

Practise 300-410 questions linked to Route Maps and Route Filtering.

Administrative Distance practice questions

Practise 300-410 questions linked to Administrative Distance.

Route Summarization practice questions

Practise 300-410 questions linked to Route Summarization.

Bidirectional Forwarding Detection (BFD) practice questions

Practise 300-410 questions linked to Bidirectional Forwarding Detection (BFD).

VPN Technologies practice questions

Practise 300-410 questions linked to VPN Technologies.

Practice this exam

Start a free 300-410 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

300-410 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this 300-410 question test?

IPv6 First Hop Security — This question tests IPv6 First Hop Security — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: show ipv6 neighbors — Option A is correct because the 'show ipv6 neighbors' command displays the IPv6 neighbor cache, which is populated by the Neighbor Discovery Protocol (NDP). In IPv6 FHS, this cache is used to verify bindings between IPv6 addresses and MAC addresses, and it is directly affected by features like RA Guard and ND Inspection, which monitor and filter NDP messages to ensure only legitimate neighbors are learned.

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.

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?

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 →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

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.