This 300-410 practice question tests your understanding of ipv6 first hop security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 troubleshoot an IPv6 First Hop Security issue:
R1# debug ipv6 nd raguard
*Mar 1 00:01:23.456: IPv6-ND-RA-Guard: R1, Fa0/0, RA received on port Fa0/0, src fe80::1, dst ff02::1
*Mar 1 00:01:23.456: IPv6-ND-RA-Guard: R1, Fa0/0, RA from fe80::1 is allowed by policy TRUSTED
*Mar 1 00:01:24.789: IPv6-ND-RA-Guard: R1, Fa0/0, RA received on port Fa0/0, src fe80::2, dst ff02::1
*Mar 1 00:01:24.789: IPv6-ND-RA-Guard: R1, Fa0/0, RA from fe80::2 is blocked by policy UNTRUSTED
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
RA Guard is configured with a policy that trusts fe80::1 and blocks fe80::2, preventing rogue RA attacks.
The debug output shows RA Guard filtering RAs based on device trust. RAs from trusted sources are allowed, while those from untrusted sources are blocked to prevent rogue RA attacks.
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.
✓
RA Guard is configured with a policy that trusts fe80::1 and blocks fe80::2, preventing rogue RA attacks.
Why this is correct
The debug confirms that fe80::1 is allowed by policy TRUSTED and fe80::2 is blocked by policy UNTRUSTED, which is the expected behavior for RA Guard.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
RA Guard is blocking all RAs regardless of source, indicating a misconfiguration.
Why it's wrong here
The output shows one RA allowed and one blocked, so not all RAs are blocked.
✗
RA Guard is allowing all RAs but logging them for analysis.
Why it's wrong here
The output explicitly shows a blocked RA, so not all are allowed.
✗
RA Guard is not configured; the debug output is from default IPv6 ND behavior.
Why it's wrong here
The debug output specifically references RA Guard policies, indicating it is configured.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The output shows one RA allowed and one blocked, so not all RAs are blocked.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: RA Guard is configured with a policy that trusts fe80::1 and blocks fe80::2, preventing rogue RA attacks. — The debug output shows RA Guard filtering RAs based on device trust. RAs from trusted sources are allowed, while those from untrusted sources are blocked to prevent rogue RA attacks.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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