- A
The router is acting as a DHCPv6 client on Gi0/0/0.
Why wrong: The interface is in server mode, not client.
- B
The router is acting as a DHCPv6 server on Gi0/0/0 and has 5 active clients.
Server mode with active clients indicates DHCPv6 server functionality.
- C
Rapid-Commit is enabled.
Why wrong: It is disabled.
- D
The interface is using SLAAC for address assignment.
Why wrong: DHCPv6 is used, not SLAAC.
Question 253 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 dhcp interface Gi0/0/0
Gi0/0/0 is in server mode Uses prefix 2001:DB8:1::/64 Rapid-Commit is disabled Preference value: 0 Information refresh option: 86400 DNS server: 2001:DB8::1 Domain name: example.com Active clients: 5 Pool: DHCP_POOL
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 acting as a DHCPv6 server on Gi0/0/0 and has 5 active clients.
The output shows Gi0/0/0 is in server mode, with a prefix, DNS server, domain name, and a pool named DHCP_POOL. The line 'Active clients: 5' confirms the router is acting as a DHCPv6 server with five active clients. This matches option B exactly.
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 acting as a DHCPv6 client on Gi0/0/0.
Why it's wrong here
The interface is in server mode, not client.
- ✓
The router is acting as a DHCPv6 server on Gi0/0/0 and has 5 active clients.
Why this is correct
Server mode with active clients indicates DHCPv6 server functionality.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Rapid-Commit is enabled.
Why it's wrong here
It is disabled.
- ✗
The interface is using SLAAC for address assignment.
Why it's wrong here
DHCPv6 is used, not SLAAC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between DHCPv6 server mode and client mode, and the trap here is that candidates may misinterpret 'Active clients' as a client-side metric or confuse DHCPv6 server operation with SLAAC.
Detailed technical explanation
How to think about this question
DHCPv6 server mode on an interface means the router assigns IPv6 addresses and other configuration parameters (like DNS and domain name) from a defined pool. The 'Active clients: 5' counter tracks the number of clients that have successfully obtained a lease. In contrast, SLAAC uses ICMPv6 Router Advertisements with the A flag set to allow clients to generate their own addresses, and does not involve a DHCPv6 server for address assignment.
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 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.
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 acting as a DHCPv6 server on Gi0/0/0 and has 5 active clients. — The output shows Gi0/0/0 is in server mode, with a prefix, DNS server, domain name, and a pool named DHCP_POOL. The line 'Active clients: 5' confirms the router is acting as a DHCPv6 server with five active clients. This matches option B exactly.
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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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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