Question 916 of 2,152

IPv6 First Hop Security →mediumMultiple ChoiceObjective-mapped

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 First Hop Security operation:

R1# show ipv6 nd raguard policy TRUSTED

Policy: TRUSTED Status: Active Device role: host Trusted ports: Fa0/1 Untrusted ports: none RA Guard: enabled RA Guard policy: allow ND inspection: enabled ND inspection policy: INSPECT

What does this output indicate?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
The policy TRUSTED allows RAs on Fa0/1 and performs ND inspection using policy INSPECT.
The output shows RA Guard is enabled with allow action, and ND inspection is enabled with policy INSPECT on the trusted port.
B
The policy TRUSTED blocks all RAs on Fa0/1 and disables ND inspection.
Why wrong: RA Guard is set to allow, not block, and ND inspection is enabled.
C
The policy TRUSTED only applies to untrusted ports and has no effect on Fa0/1.
Why wrong: Fa0/1 is listed as a trusted port, so the policy applies to it.
D
The policy TRUSTED is inactive and not applied to any interface.
Why wrong: Status is Active, and Fa0/1 is a trusted port.

Full breakdown with real-world context →

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 TRUSTED allows RAs on Fa0/1 and performs ND inspection using policy INSPECT.

The output shows that policy TRUSTED is active, with Fa0/1 listed as a trusted port. Since RA Guard is enabled with an 'allow' policy, Router Advertisements (RAs) received on Fa0/1 are permitted. Additionally, ND inspection is enabled using policy INSPECT, meaning Neighbor Discovery messages are inspected on that port. This matches option A.

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 TRUSTED allows RAs on Fa0/1 and performs ND inspection using policy INSPECT.
Why this is correct
The output shows RA Guard is enabled with allow action, and ND inspection is enabled with policy INSPECT on the trusted port.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The policy TRUSTED blocks all RAs on Fa0/1 and disables ND inspection.
Why it's wrong here
RA Guard is set to allow, not block, and ND inspection is enabled.
✗
The policy TRUSTED only applies to untrusted ports and has no effect on Fa0/1.
Why it's wrong here
Fa0/1 is listed as a trusted port, so the policy applies to it.
✗
The policy TRUSTED is inactive and not applied to any interface.
Why it's wrong here
Status is Active, and Fa0/1 is a trusted port.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may misinterpret 'RA Guard: enabled' as blocking RAs, but the output explicitly shows 'RA Guard policy: allow', meaning RAs are permitted on the trusted port.

Detailed technical explanation

How to think about this question

IPv6 RA Guard and ND inspection are part of Cisco's IPv6 First Hop Security framework, designed to mitigate rogue RA and ND spoofing attacks. The 'allow' RA Guard policy on a trusted port permits RAs from legitimate sources, while ND inspection validates ND messages against a binding table to prevent address spoofing. In real-world deployments, trusted ports are typically assigned to legitimate routers or switches, while untrusted ports face stricter filtering.

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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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 TRUSTED allows RAs on Fa0/1 and performs ND inspection using policy INSPECT. — The output shows that policy TRUSTED is active, with Fa0/1 listed as a trusted port. Since RA Guard is enabled with an 'allow' policy, Router Advertisements (RAs) received on Fa0/1 are permitted. Additionally, ND inspection is enabled using policy INSPECT, meaning Neighbor Discovery messages are inspected on that port. This matches option A.

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.

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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