- A
The policy INSPECT validates source and destination MAC and IPv6 addresses on untrusted port Fa0/0.
All four validation checks are enabled, and the port is untrusted.
- B
The policy INSPECT only validates source MAC addresses on trusted ports.
Why wrong: The port is untrusted, not trusted, and multiple validations are enabled.
- C
The policy INSPECT disables ND inspection and logs all ND messages.
Why wrong: ND inspection is enabled, not disabled.
- D
The policy INSPECT is inactive and not applied to any interface.
Why wrong: Status is Active, and Fa0/0 is listed as an untrusted port.
Question 620 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 to verify IPv6 ND inspection policy:
R1# show ipv6 nd inspection policy INSPECT
Policy: INSPECT Status: Active Device role: node Trusted ports: none Untrusted ports: Fa0/0 ND inspection: enabled Validation: - Source MAC address: verify - Destination MAC address: verify - IPv6 source address: verify - IPv6 destination address: verify - Nonce: disabled - Timestamp: disabled
What does this output indicate?
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 policy INSPECT validates source and destination MAC and IPv6 addresses on untrusted port Fa0/0.
Option A is correct because the output shows that the policy INSPECT is active, with ND inspection enabled and validation configured for source MAC, destination MAC, IPv6 source, and IPv6 destination addresses. The 'Untrusted ports: Fa0/0' indicates that these validations are applied to that untrusted port, which is the standard behavior for IPv6 ND inspection to prevent spoofing attacks on untrusted interfaces.
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 policy INSPECT validates source and destination MAC and IPv6 addresses on untrusted port Fa0/0.
Why this is correct
All four validation checks are enabled, and the port is untrusted.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The policy INSPECT only validates source MAC addresses on trusted ports.
Why it's wrong here
The port is untrusted, not trusted, and multiple validations are enabled.
- ✗
The policy INSPECT disables ND inspection and logs all ND messages.
Why it's wrong here
ND inspection is enabled, not disabled.
- ✗
The policy INSPECT is inactive and not applied to any interface.
Why it's wrong here
Status is Active, and Fa0/0 is listed as an untrusted port.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between trusted and untrusted ports in IPv6 ND inspection, where candidates may mistakenly think validation occurs on trusted ports or that the policy is inactive when it is actually active on untrusted ports.
Detailed technical explanation
How to think about this question
IPv6 ND inspection, part of IPv6 First Hop Security, uses the Neighbor Discovery Protocol (NDP) to validate address bindings and prevent attacks like Neighbor Advertisement spoofing. Under the hood, it maintains a binding table and drops ND messages that fail validation checks (e.g., source MAC mismatch with the claimed IPv6 address). In a real-world scenario, this is critical on access ports where untrusted hosts could send rogue ND messages to 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 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.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
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 policy INSPECT validates source and destination MAC and IPv6 addresses on untrusted port Fa0/0. — Option A is correct because the output shows that the policy INSPECT is active, with ND inspection enabled and validation configured for source MAC, destination MAC, IPv6 source, and IPv6 destination addresses. The 'Untrusted ports: Fa0/0' indicates that these validations are applied to that untrusted port, which is the standard behavior for IPv6 ND inspection to prevent spoofing attacks on untrusted interfaces.
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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