- A
The interface drops all incoming Router Advertisements from other routers.
The 'ipv6 nd raguard' command blocks RAs received on this interface, enforcing first-hop security.
- B
The interface sends RAs with the autonomous flag set to allow SLAAC.
Why wrong: The 'no-autoconfig' keyword actually clears the autonomous flag, preventing SLAAC.
- C
The interface only allows RAs from a specific authorized router.
Why wrong: RA guard blocks all RAs, not selectively allowing any.
- D
The interface drops all Neighbor Solicitations.
Why wrong: RA guard only filters Router Advertisements, not Neighbor Solicitations.
Question 1,171 of 2,152
300-410 IPv6 First Hop Security Practice Question
This 300-410 practice question tests your understanding of ipv6 first hop security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Interface GigabitEthernet0/1 is configured as shown: interface GigabitEthernet0/1
ipv6 address 2001:db8:1::1/64 ipv6 nd raguard ipv6 nd prefix default no-autoconfig
What is the effect of this configuration?
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
✓
The interface drops all incoming Router Advertisements from other routers.
The `ipv6 nd raguard` command enables Router Advertisement (RA) guard on the interface, which drops all incoming RAs from other routers to prevent rogue RA attacks. The `ipv6 nd prefix default no-autoconfig` command suppresses the autonomous flag in sent RAs, but the RA guard is the active security feature that blocks incoming RAs, making option A correct.
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.
- ✓
The interface drops all incoming Router Advertisements from other routers.
Why this is correct
The 'ipv6 nd raguard' command blocks RAs received on this interface, enforcing first-hop security.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The interface sends RAs with the autonomous flag set to allow SLAAC.
Why it's wrong here
The 'no-autoconfig' keyword actually clears the autonomous flag, preventing SLAAC.
- ✗
The interface only allows RAs from a specific authorized router.
Why it's wrong here
RA guard blocks all RAs, not selectively allowing any.
- ✗
The interface drops all Neighbor Solicitations.
Why it's wrong here
RA guard only filters Router Advertisements, not Neighbor Solicitations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between commands that affect outgoing RAs (like `ipv6 nd prefix default no-autoconfig`) versus those that filter incoming RAs (like `ipv6 nd raguard`), leading candidates to confuse the direction of the traffic being controlled.
Trap categories for this question
Keyword trap
The 'no-autoconfig' keyword actually clears the autonomous flag, preventing SLAAC.
Detailed technical explanation
How to think about this question
RA guard operates by inspecting incoming ICMPv6 type 134 (Router Advertisement) messages and dropping them if the interface is configured as a host-facing port. This is critical in enterprise networks to prevent man-in-the-middle attacks where a rogue device advertises itself as a default gateway. The `no-autoconfig` keyword affects only outgoing RAs, ensuring hosts do not use SLAAC to autoconfigure addresses from the prefix, but it does not influence the RA guard behavior on incoming 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
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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: The interface drops all incoming Router Advertisements from other routers. — The `ipv6 nd raguard` command enables Router Advertisement (RA) guard on the interface, which drops all incoming RAs from other routers to prevent rogue RA attacks. The `ipv6 nd prefix default no-autoconfig` command suppresses the autonomous flag in sent RAs, but the RA guard is the active security feature that blocks incoming RAs, making option A correct.
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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