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300-410 Practice Question: Which TWO statements about IPv6 First Hop…
Which TWO statements about IPv6 First Hop Security (FHS) RA Guard are true? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the distinction between the default action (block) and optional actions (log), and the specific validation of source MAC against link-local IPv6 address rather than any IPv6 address, leading candidates to confuse the validation scope.
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 default RA Guard policy action is to block Router Advertisements from unauthorized ports.
The default action of an IPv6 RA Guard policy is to block Router Advertisements (RAs) received on ports that are not explicitly authorized. This prevents rogue devices from sending malicious RAs that could redirect traffic or launch man-in-the-middle attacks. The RA Guard feature enforces this by dropping unauthorized RAs at the switch level.
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 default RA Guard policy action is to block Router Advertisements from unauthorized ports.
Why this is correct
Correct. The default action for an RA Guard policy is 'block', which drops unauthorized RAs.
- ✗
RA Guard validates the source MAC address of Router Advertisements against the IPv6 source address.
Why it's wrong here
Incorrect. RA Guard does not perform source MAC validation; it checks router preference and hop limit fields.
- ✗
The default RA Guard policy action is to log Router Advertisements from unauthorized ports.
Why it's wrong here
Incorrect. The default action is 'block', not 'log'. Logging can be configured separately.
- ✓
RA Guard can be applied on a per-interface or per-VLAN basis using a policy map.
Why this is correct
Correct. RA Guard policies are applied using a policy map that can be attached to an interface or a VLAN.
- ✗
RA Guard is typically enabled on trunk ports to protect against rogue RAs from other VLANs.
Why it's wrong here
Incorrect. RA Guard is usually applied on access ports; trunk ports often need to forward legitimate RAs.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.