- A
Interface Gi0/0/0 is allowed to send Router Advertisements.
Role 'router' under RA guard permits sending RAs.
- B
Interface Gi0/0/1 is allowed to send Router Advertisements.
Why wrong: Role 'host' blocks RAs.
- C
Interface Gi0/0/2 is allowed to send Router Advertisements.
Why wrong: Default policy with role 'host' blocks RAs.
- D
All interfaces are blocked from sending Router Advertisements.
Why wrong: Gi0/0/0 is permitted to send RAs.
Question 1,251 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 nd raguard policy Interface Policy Role State
Gi0/0/0 RA_GUARD router ACTIVE Gi0/0/1 RA_GUARD host ACTIVE Gi0/0/2 (default) host 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 allowed to send Router Advertisements.
The 'show ipv6 nd raguard policy' output shows that interface Gi0/0/0 is configured with the RA_GUARD policy in the 'router' role and is ACTIVE. In IPv6 RA Guard, a port in the 'router' role is explicitly permitted to send Router Advertisements (RAs), while ports in the 'host' role are blocked from sending RAs. Therefore, only Gi0/0/0 is allowed to send RAs, making option A correct.
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 allowed to send Router Advertisements.
Why this is correct
Role 'router' under RA guard permits sending RAs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Interface Gi0/0/1 is allowed to send Router Advertisements.
Why it's wrong here
Role 'host' blocks RAs.
- ✗
Interface Gi0/0/2 is allowed to send Router Advertisements.
Why it's wrong here
Default policy with role 'host' blocks RAs.
- ✗
All interfaces are blocked from sending Router Advertisements.
Why it's wrong here
Gi0/0/0 is permitted to send RAs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that all interfaces with an active RA Guard policy are blocked, but the key differentiator is the 'role' (router vs. host), not just the policy being active.
Detailed technical explanation
How to think about this question
RA Guard (RFC 6105) is a First Hop Security feature that prevents rogue IPv6 Router Advertisements by filtering RAs based on the port role. The 'router' role permits RA transmission, while the 'host' role drops all RAs received on that port. The default policy applies to interfaces not explicitly configured with a custom policy, and its default role is 'host', which blocks RAs. This is critical in enterprise networks to prevent man-in-the-middle attacks via rogue RAs that could redirect traffic.
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.
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 allowed to send Router Advertisements. — The 'show ipv6 nd raguard policy' output shows that interface Gi0/0/0 is configured with the RA_GUARD policy in the 'router' role and is ACTIVE. In IPv6 RA Guard, a port in the 'router' role is explicitly permitted to send Router Advertisements (RAs), while ports in the 'host' role are blocked from sending RAs. Therefore, only Gi0/0/0 is allowed to send RAs, making option A correct.
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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