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?
The router is not sending any Router Advertisements.
Why wrong: 8 RAs were sent.
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.
There is a high number of errors in IPv6 traffic.
Why wrong: Errors are 0.
The router is dropping many packets.
Why wrong: Dropped is 0.
Answer choices
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.
The ND statistics show that Router Advertisements (RAs) are being sent (8 sent) and received (2 received). This is normal for a router that is advertising itself. The numbers are balanced and indicate proper ND operation.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
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
OSPF neighbours must agree on key parameters.
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
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.
Detailed technical explanation
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.
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
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
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.
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FAQ
IPv6 First Hop Security — This question tests IPv6 First Hop Security — OSPF neighbours must agree on key parameters..
The correct answer is: The router is receiving more Neighbor Solicitations than it is sending, which is expected. — The ND statistics show that Router Advertisements (RAs) are being sent (8 sent) and received (2 received). This is normal for a router that is advertising itself. The numbers are balanced and indicate proper ND operation.
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.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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