- A
It validates Neighbor Solicitation and Neighbor Advertisement messages against the IPv6 snooping binding table.
ND Inspection checks NS and NA messages against the binding table to prevent spoofing attacks.
- B
It can be configured to rate-limit ND packets on a per-interface basis.
Rate-limiting is a key feature of ND Inspection to prevent DoS attacks using excessive ND messages.
- C
It prevents rogue DHCPv6 servers from assigning malicious addresses.
Why wrong: This is the function of DHCPv6 Guard, not ND Inspection; ND Inspection focuses on ND messages, not DHCP.
- D
It uses a prefix list to determine which source addresses are allowed.
Why wrong: ND Inspection uses the binding table, not a prefix list; prefix lists are used in other features like RA Guard.
- E
It is enabled globally and cannot be applied on a per-interface basis.
Why wrong: ND Inspection is enabled per-interface using the 'ipv6 nd inspection' command, not just globally.
300-410 IPv6 First Hop Security Practice Question
This 300-410 practice question tests your understanding of ipv6 first hop security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 statements about IPv6 Neighbor Discovery (ND) Inspection are true? (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
It validates Neighbor Solicitation and Neighbor Advertisement messages against the IPv6 snooping binding table.
Option A is correct because IPv6 ND Inspection validates Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages against the IPv6 snooping binding table. This table is built by gleaning information from DHCPv6 messages or by using the IPv6 Neighbor Discovery protocol itself, ensuring that only legitimate ND messages from trusted sources are forwarded, preventing attacks like Neighbor Cache exhaustion or address spoofing.
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.
- ✓
It validates Neighbor Solicitation and Neighbor Advertisement messages against the IPv6 snooping binding table.
Why this is correct
ND Inspection checks NS and NA messages against the binding table to prevent spoofing attacks.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
It can be configured to rate-limit ND packets on a per-interface basis.
Why this is correct
Rate-limiting is a key feature of ND Inspection to prevent DoS attacks using excessive ND messages.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It prevents rogue DHCPv6 servers from assigning malicious addresses.
Why it's wrong here
This is the function of DHCPv6 Guard, not ND Inspection; ND Inspection focuses on ND messages, not DHCP.
- ✗
It uses a prefix list to determine which source addresses are allowed.
Why it's wrong here
ND Inspection uses the binding table, not a prefix list; prefix lists are used in other features like RA Guard.
- ✗
It is enabled globally and cannot be applied on a per-interface basis.
Why it's wrong here
ND Inspection is enabled per-interface using the 'ipv6 nd inspection' command, not just globally.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between IPv6 First Hop Security features, and the trap here is confusing ND Inspection (which validates ND messages) with DHCPv6 Guard (which blocks rogue DHCPv6 servers) or RA Guard (which uses prefix lists).
Trap categories for this question
Command / output trap
ND Inspection is enabled per-interface using the 'ipv6 nd inspection' command, not just globally.
Detailed technical explanation
How to think about this question
Under the hood, IPv6 ND Inspection intercepts NS and NA messages and checks the source IPv6 address and link-layer address against the binding table, which is populated by DHCPv6 snooping or by gleaning from ND messages. In a real-world scenario, if an attacker sends a forged NA claiming to be the default router, ND Inspection drops the packet because the binding table does not contain that mapping, thus preventing a man-in-the-middle attack. The feature also supports rate-limiting to mitigate DoS attacks that flood ND packets.
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.
What to study next
Got this wrong? Here's your next step.
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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: It validates Neighbor Solicitation and Neighbor Advertisement messages against the IPv6 snooping binding table. — Option A is correct because IPv6 ND Inspection validates Neighbor Solicitation (NS) and Neighbor Advertisement (NA) messages against the IPv6 snooping binding table. This table is built by gleaning information from DHCPv6 messages or by using the IPv6 Neighbor Discovery protocol itself, ensuring that only legitimate ND messages from trusted sources are forwarded, preventing attacks like Neighbor Cache exhaustion or address spoofing.
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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