- A
The router is not sending any Router Advertisements.
Why wrong: 8 RAs were sent.
- B
The router is receiving more Neighbor Solicitations than it is sending, which is expected.
NS received (50) vs sent (40) is typical as the router responds to queries.
- C
There is a high number of errors in IPv6 traffic.
Why wrong: Errors are 0.
- D
The router is dropping many packets.
Why wrong: Dropped is 0.
Question 518 of 2,152
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.
A network engineer runs the following command on Router R1:
R1# show ipv6 traffic
IPv6 statistics: Rcvd: 1000 total, 800 unicast, 200 multicast Sent: 900 total, 700 unicast, 200 multicast Errors: 0 Dropped: 0 ND statistics: NS: 50 received, 40 sent NA: 30 received, 20 sent RS: 10 received, 5 sent RA: 2 received, 8 sent Redirect: 0 received, 0 sent
Based on this output, which statement is correct?
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 router is receiving more Neighbor Solicitations than it is sending, which is expected.
Option B is correct because in IPv6, Neighbor Solicitations (NS) are used for address resolution and duplicate address detection. A router typically receives more NS messages than it sends, as hosts send NS to resolve the router's link-layer address, while the router sends NS primarily for DAD or to verify neighbor reachability. The output shows 50 NS received versus 40 sent, which aligns with this expected behavior.
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 router is not sending any Router Advertisements.
Why it's wrong here
8 RAs were sent.
- ✓
The router is receiving more Neighbor Solicitations than it is sending, which is expected.
Why this is correct
NS received (50) vs sent (40) is typical as the router responds to queries.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
There is a high number of errors in IPv6 traffic.
Why it's wrong here
Errors are 0.
- ✗
The router is dropping many packets.
Why it's wrong here
Dropped is 0.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the expected asymmetry in Neighbor Solicitation counts between routers and hosts, where candidates mistakenly think a router should send more NS than it receives, but in practice, routers receive more NS from hosts performing address resolution.
Detailed technical explanation
How to think about this question
IPv6 Neighbor Discovery (ND) uses ICMPv6 messages (RFC 4861) for address resolution, DAD, and router discovery. The NS/NA ratio often favors more received NS on routers because hosts initiate NS to resolve the router's MAC address, while routers send NS only for specific tasks like neighbor unreachability detection (NUD) or DAD. In real-world networks, a high NS receive count can indicate hosts performing DAD or resolving the default gateway, which is normal behavior.
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.
Visual reference
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 router is receiving more Neighbor Solicitations than it is sending, which is expected. — Option B is correct because in IPv6, Neighbor Solicitations (NS) are used for address resolution and duplicate address detection. A router typically receives more NS messages than it sends, as hosts send NS to resolve the router's link-layer address, while the router sends NS primarily for DAD or to verify neighbor reachability. The output shows 50 NS received versus 40 sent, which aligns with this expected behavior.
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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