- A
Interface Gi0/0/0 is trusted to send DHCPv6 replies.
Role 'server' allows sending DHCP replies.
- B
Interface Gi0/0/1 is trusted to send DHCPv6 replies.
Why wrong: Role 'client' blocks DHCP replies.
- C
Interface Gi0/0/2 is trusted to send DHCPv6 replies.
Why wrong: Default policy with role 'client' blocks DHCP replies.
- D
All interfaces are blocked from sending DHCPv6 replies.
Why wrong: Gi0/0/0 is permitted to send DHCP replies.
Question 1,582 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 guard policy Interface Policy Role State
Gi0/0/0 DHCP_GUARD server ACTIVE Gi0/0/1 DHCP_GUARD client ACTIVE Gi0/0/2 (default) client ACTIVE
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
✓
Interface Gi0/0/0 is trusted to send DHCPv6 replies.
The output shows that interface Gi0/0/0 has the role 'server' and is ACTIVE under the DHCPv6 guard policy. In DHCPv6 guard, a port with the role 'server' is trusted to send DHCPv6 replies (advertise and reply messages), while ports with the role 'client' are blocked from sending such messages. Therefore, only Gi0/0/0 is allowed to send DHCPv6 replies.
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.
- ✓
Interface Gi0/0/0 is trusted to send DHCPv6 replies.
Why this is correct
Role 'server' allows sending DHCP replies.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Interface Gi0/0/1 is trusted to send DHCPv6 replies.
Why it's wrong here
Role 'client' blocks DHCP replies.
- ✗
Interface Gi0/0/2 is trusted to send DHCPv6 replies.
Why it's wrong here
Default policy with role 'client' blocks DHCP replies.
- ✗
All interfaces are blocked from sending DHCPv6 replies.
Why it's wrong here
Gi0/0/0 is permitted to send DHCP replies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that the 'client' role allows sending replies, when in fact only the 'server' role permits DHCPv6 server messages, and the 'client' role strictly blocks them.
Detailed technical explanation
How to think about this question
DHCPv6 guard is a first-hop security feature that prevents rogue DHCPv6 servers by filtering DHCPv6 server messages (Advertise, Reply) on untrusted ports. The role is configured per interface under a DHCPv6 guard policy (using `ipv6 dhcp guard policy`), and the default role is 'client' (untrusted). In real-world deployments, this is critical to mitigate DHCPv6 spoofing attacks, especially in shared access networks where an attacker could plug in a malicious DHCPv6 server.
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: Interface Gi0/0/0 is trusted to send DHCPv6 replies. — The output shows that interface Gi0/0/0 has the role 'server' and is ACTIVE under the DHCPv6 guard policy. In DHCPv6 guard, a port with the role 'server' is trusted to send DHCPv6 replies (advertise and reply messages), while ports with the role 'client' are blocked from sending such messages. Therefore, only Gi0/0/0 is allowed to send DHCPv6 replies.
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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