- A
Forward the RA to the CPU for inspection
Why wrong: RA Guard does not forward the RA; it drops it by default.
- B
Drop the RA and generate a syslog message
Correct. The default action is to drop the RA and log the event.
- C
Shut down the port
Why wrong: Shutting down the port is not the default action; it is a possible manual configuration.
- D
Send a notification to the network management system
Why wrong: This is not the default action; RA Guard only drops and logs by default.
Question 866 of 2,152
300-410 IPv6 First Hop Security Practice Question
This 300-410 practice question tests your understanding of ipv6 first hop security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
In IPv6 FHS, what is the default action for 'RA Guard' when a rogue RA is detected on a switch port?
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
✓
Drop the RA and generate a syslog message
In IPv6 First Hop Security (FHS), RA Guard is designed to block rogue Router Advertisement (RA) messages on switch ports. When a rogue RA is detected, the default action is to drop the offending packet and generate a syslog message, as specified by the 'drop' policy in the 'ipv6 nd raguard' configuration. This prevents unauthorized devices from advertising themselves as routers, mitigating man-in-the-middle 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.
- ✗
Forward the RA to the CPU for inspection
Why it's wrong here
RA Guard does not forward the RA; it drops it by default.
- ✓
Drop the RA and generate a syslog message
Why this is correct
Correct. The default action is to drop the RA and log the event.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Shut down the port
Why it's wrong here
Shutting down the port is not the default action; it is a possible manual configuration.
- ✗
Send a notification to the network management system
Why it's wrong here
This is not the default action; RA Guard only drops and logs by default.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between the default action (drop and syslog) and the more severe 'errdisable' action (shut down the port), leading candidates to mistakenly choose port shutdown as the default.
Detailed technical explanation
How to think about this question
RA Guard is implemented using the 'ipv6 nd raguard' policy on a switch port, which applies a device-role (e.g., 'host' or 'router') to filter RAs. The default 'drop' action is enforced by hardware ACLs in the switch ASIC, ensuring minimal performance impact. In a real-world scenario, a malicious host sending RAs with a low hop limit could cause a denial-of-service (DoS) if not dropped, and RA Guard's default behavior prevents this without manual intervention.
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
Got this wrong? Here's your next step.
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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: Drop the RA and generate a syslog message — In IPv6 First Hop Security (FHS), RA Guard is designed to block rogue Router Advertisement (RA) messages on switch ports. When a rogue RA is detected, the default action is to drop the offending packet and generate a syslog message, as specified by the 'drop' policy in the 'ipv6 nd raguard' configuration. This prevents unauthorized devices from advertising themselves as routers, mitigating man-in-the-middle attacks.
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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