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 dhcp binding
Client: FE80::1 DUID: 0003000100AABBCCDDEE
Username: unknown
IA NA: IA ID 0x00010001, T1 302400, T2 483840 Address: 2001:DB8:1::100/128 Preferred lifetime 604800, valid lifetime 2592000 Expires at Sep 15 2024 12:00 PM (2592000 seconds)
Based on this output, which statement is correct?
The client has been assigned an IPv6 address via DHCPv6.
The binding shows an IA NA with an assigned address.
The client is using SLAAC instead of DHCPv6.
Why wrong: The binding indicates DHCPv6 was used.
The client's lease has expired.
Why wrong: The valid lifetime is 2592000 seconds, so it is still valid.
The client is not authorized.
Why wrong: The username is unknown, but the binding is still active.
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 client has been assigned an IPv6 address via DHCPv6.
The output shows a DHCPv6 binding for a client with link-local address FE80::1, DUID, and an assigned IPv6 address 2001:DB8:1::100/128 with valid lifetime. This indicates that DHCPv6 is functioning and the client has a valid lease.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The client has been assigned an IPv6 address via DHCPv6.
Why this is correct
The binding shows an IA NA with an assigned address.
Related concept
Read the scenario before looking for a memorised answer.
The client is using SLAAC instead of DHCPv6.
Why it's wrong here
The binding indicates DHCPv6 was used.
The client's lease has expired.
Why it's wrong here
The valid lifetime is 2592000 seconds, so it is still valid.
The client is not authorized.
Why it's wrong here
The username is unknown, but the binding is still active.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
IPv6 First Hop Security — This question tests IPv6 First Hop Security — Read the scenario before looking for a memorised answer..
The correct answer is: The client has been assigned an IPv6 address via DHCPv6. — The output shows a DHCPv6 binding for a client with link-local address FE80::1, DUID, and an assigned IPv6 address 2001:DB8:1::100/128 with valid lifetime. This indicates that DHCPv6 is functioning and the client has a valid lease.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 18, 2026
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