- A
The interface will allow DHCP server messages only from sources matching SERVER_ACL.
The 'match server' clause restricts which servers are trusted, and the policy is applied to the interface.
- B
The interface will block all DHCP server messages.
Why wrong: The policy allows server messages that match the ACL, not block all.
- C
The interface will allow all DHCP client messages.
Why wrong: The policy focuses on server messages; client messages are not explicitly filtered.
- D
The interface will drop all DHCP messages.
Why wrong: Only server messages not matching the ACL are dropped.
Question 1,160 of 2,152
IPv6 DHCP Guard Policy with device-role server and ACL | Cisco CCNP ENARSI 300-410
This 300-410 practice question tests your understanding of ipv6 first hop security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Examine the following partial IPv6 DHCP guard configuration:
ipv6 dhcp guard policy DHCP_GUARD device-role server match server access-list SERVER_ACL
interface GigabitEthernet0/2
ipv6 dhcp guard policy DHCP_GUARD
Which statement is true about this configuration?
Quick Answer
The correct statement is that the interface will allow DHCP server messages only from sources matching SERVER_ACL. This is because the DHCP guard policy configured with device-role server explicitly designates the interface as a trusted DHCP server, but the match server access-list SERVER_ACL clause restricts which server source addresses are permitted; any DHCP server message not matching the ACL is dropped. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how DHCP guard policies enforce role-based filtering on IPv6 networks, often appearing in questions that mix device-role client and server with ACLs to create traps where candidates forget that server role still requires ACL validation. A common mistake is assuming device-role server allows all DHCP server traffic, but the ACL is mandatory for granular control. Remember the memory tip: “Server role opens the door, but the ACL holds the key.”
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 interface will allow DHCP server messages only from sources matching SERVER_ACL.
The configuration applies the DHCP_GUARD policy to GigabitEthernet0/2 with the device-role set to server and a match server access-list SERVER_ACL. This means the interface is configured to trust DHCP server messages, but only those that match the source addresses permitted by SERVER_ACL. Any DHCP server messages from sources not matching the ACL will be dropped, while client messages are unaffected because the policy only filters server-side traffic.
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 interface will allow DHCP server messages only from sources matching SERVER_ACL.
Why this is correct
The 'match server' clause restricts which servers are trusted, and the policy is applied to the interface.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The interface will block all DHCP server messages.
Why it's wrong here
The policy allows server messages that match the ACL, not block all.
- ✗
The interface will allow all DHCP client messages.
Why it's wrong here
The policy focuses on server messages; client messages are not explicitly filtered.
- ✗
The interface will drop all DHCP messages.
Why it's wrong here
Only server messages not matching the ACL are dropped.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that setting device-role server blocks all server messages, but the match server ACL allows specific trusted servers, so the interface permits only those matching the ACL.
Detailed technical explanation
How to think about this question
The IPv6 DHCP guard feature, defined in RFC 7610, operates by inspecting DHCPv6 messages and applying a policy based on the device-role (client or server). When device-role is set to server, the switch validates that incoming DHCPv6 server messages (e.g., ADVERTISE, REPLY) originate from sources matching the specified ACL; any mismatch triggers a drop. This prevents rogue DHCPv6 servers from poisoning the network, a common attack vector in IPv6 first-hop security.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 interface will allow DHCP server messages only from sources matching SERVER_ACL. — The configuration applies the DHCP_GUARD policy to GigabitEthernet0/2 with the device-role set to server and a match server access-list SERVER_ACL. This means the interface is configured to trust DHCP server messages, but only those that match the source addresses permitted by SERVER_ACL. Any DHCP server messages from sources not matching the ACL will be dropped, while client messages are unaffected because the policy only filters server-side traffic.
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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