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300-410 Practice Question: An engineer is troubleshooting IPv6 connectivity…
An engineer is troubleshooting IPv6 connectivity issues on a switch that has IPv6 First Hop Security features enabled. Clients are unable to obtain a valid IPv6 address via SLAAC. Which TWO configuration changes could resolve this issue? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the distinction between RA Guard (which filters RAs) and ND Inspection (which validates ND messages), leading candidates to overlook that both features can block RAs, but they operate at different layers and require different fixes.
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
✓
Modify the RA Guard policy to permit Router Advertisements from the trusted router port.
RA Guard is an IPv6 First Hop Security feature that filters Router Advertisements (RAs) based on port trust. By default, RA Guard blocks RAs on untrusted ports. Modifying the RA Guard policy to permit RAs from the trusted router port allows legitimate RAs to reach clients, enabling SLAAC address assignment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Modify the RA Guard policy to permit Router Advertisements from the trusted router port.
Why this is correct
Correct. If RA Guard is blocking legitimate RAs, permitting the trusted port resolves the issue.
- ✗
Disable DHCPv6 snooping on the VLAN to allow RAs to be forwarded.
Why it's wrong here
Incorrect. DHCPv6 snooping does not affect RA forwarding; it only monitors DHCPv6 messages.
- ✗
Enable IPv6 Source Guard on the client-facing interfaces.
Why it's wrong here
Incorrect. Source Guard filters source addresses, not RAs, and would not help with RA delivery.
- ✓
Add the router's MAC address to the ND inspection allowed-list.
Why this is correct
Correct. ND inspection can drop RAs from unknown sources; adding the router's MAC allows them.
- ✗
Configure a DHCPv6 pool on the switch to provide addresses to clients.
Why it's wrong here
Incorrect. SLAAC does not use DHCPv6; a DHCPv6 pool is for stateful DHCPv6, not SLAAC.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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