- A
Interface Gi0/0/2 is protected by the GUARD_POLICY policy.
Why wrong: Gi0/0/2 uses the default policy, not GUARD_POLICY.
- B
Interface Gi0/0/2 is not protected by the custom guard policy and may be vulnerable to spoofing attacks.
The default policy provides minimal protection; the custom GUARD_POLICY is not applied to Gi0/0/2.
- C
All interfaces are equally protected by the same policy.
Why wrong: Gi0/0/0 and Gi0/0/1 use GUARD_POLICY, while Gi0/0/2 uses the default policy.
- D
The role 'host' means Gi0/0/2 is acting as a device-guard.
Why wrong: The role 'host' indicates it is a host-facing interface, not a device-guard.
Question 1,678 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 snooping policy Interface Policy Role State
Gi0/0/0 GUARD_POLICY device-guard ACTIVE Gi0/0/1 GUARD_POLICY device-guard 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 Gi0/0/2 is not protected by the custom guard policy and may be vulnerable to spoofing attacks.
Option B is correct because the output shows that Gi0/0/2 is using the default policy with a role of 'host', meaning it is not protected by the custom GUARD_POLICY. The device-guard feature, part of IPv6 First Hop Security, applies only to interfaces with a custom policy; a default policy does not enforce spoofing protection, leaving the interface vulnerable to attacks like rogue RA or ND spoofing.
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 Gi0/0/2 is protected by the GUARD_POLICY policy.
Why it's wrong here
Gi0/0/2 uses the default policy, not GUARD_POLICY.
- ✓
Interface Gi0/0/2 is not protected by the custom guard policy and may be vulnerable to spoofing attacks.
Why this is correct
The default policy provides minimal protection; the custom GUARD_POLICY is not applied to Gi0/0/2.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
All interfaces are equally protected by the same policy.
Why it's wrong here
Gi0/0/0 and Gi0/0/1 use GUARD_POLICY, while Gi0/0/2 uses the default policy.
- ✗
The role 'host' means Gi0/0/2 is acting as a device-guard.
Why it's wrong here
The role 'host' indicates it is a host-facing interface, not a device-guard.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that all interfaces are equally protected by a guard policy, when in fact the (default) policy indicates no custom protection, leaving the interface vulnerable to spoofing attacks.
Detailed technical explanation
How to think about this question
The device-guard feature (RFC 6105) uses policies to validate IPv6 neighbor discovery messages; a custom policy can enforce strict checks like prefix and address validation, while the default policy applies minimal filtering. In real-world scenarios, an attacker on an unprotected interface (default policy) could send malicious RA messages to redirect traffic, enabling man-in-the-middle attacks. The 'show ipv6 snooping policy' command reveals which interfaces are actively protected by custom policies versus those relying on defaults.
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.
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 Gi0/0/2 is not protected by the custom guard policy and may be vulnerable to spoofing attacks. — Option B is correct because the output shows that Gi0/0/2 is using the default policy with a role of 'host', meaning it is not protected by the custom GUARD_POLICY. The device-guard feature, part of IPv6 First Hop Security, applies only to interfaces with a custom policy; a default policy does not enforce spoofing protection, leaving the interface vulnerable to attacks like rogue RA or ND spoofing.
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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