20+ practice questions focused on IPv6 First Hop Security — one of the most tested topics on the Cisco CCNP ENARSI 300-410 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start IPv6 First Hop Security PracticeA network engineer is troubleshooting an IPv6 neighbor discovery issue on a switch running IOS-XE. Hosts on VLAN 100 are intermittently losing connectivity to the default gateway. The switch is configured with IPv6 First Hop Security features including RA Guard and DHCPv6 Guard. The engineer notices that the switch is dropping valid Router Advertisements from the legitimate router. What is the most likely cause of this issue?
Explanation: RA Guard is configured to drop RAs from unauthorized routers. If the legitimate router's MAC address is not in the RA Guard policy's allowed list or the policy is misconfigured, valid RAs will be dropped, causing hosts to lose their default gateway.
An engineer is troubleshooting a network where IPv6 hosts cannot obtain IP addresses via DHCPv6. The switch is configured with DHCPv6 Guard to prevent rogue DHCP servers. The legitimate DHCPv6 server is connected to port GigabitEthernet1/0/1. The engineer sees that DHCPv6 Solicit messages from hosts reach the server, but the server's Advertise and Reply messages are not reaching the hosts. What is the most likely root cause?
Explanation: DHCPv6 Guard on the switch port connected to the DHCP server will drop DHCPv6 server messages (Advertise, Reply) unless the port is configured as a trusted DHCPv6 server port. If the port is not trusted, the server's responses are dropped.
A network engineer is troubleshooting an issue where IPv6 traffic is being forwarded incorrectly on a switch. The switch is configured with IPv6 Source Guard on access ports. A legitimate host on port Fa0/1 with IPv6 address 2001:db8:1::10 is unable to send traffic to the default gateway. The engineer checks the IPv6 binding table and sees that the host's entry is missing. What is the most likely cause?
Explanation: IPv6 Source Guard requires a valid binding entry (learned via DHCPv6 snooping or ND snooping) to permit traffic. If the host is using a static IPv6 address, ND snooping must be enabled to learn the binding; otherwise, traffic is dropped.
An engineer is troubleshooting an IPv6 connectivity issue where hosts on VLAN 10 cannot reach the internet. The switch is configured with IPv6 First Hop Security features including RA Guard and DHCPv6 Guard. The legitimate router is connected to port Gi1/0/1. The engineer notices that the router is sending RAs, but hosts are not receiving them. The switch shows that RA Guard is dropping packets on port Gi1/0/1. What is the most likely misconfiguration?
Explanation: RA Guard drops RAs from devices that are not authorized as routers. If the legitimate router's MAC address is not included in the RA Guard policy's allowed list, or if the port is not configured with the correct device-role, the RAs will be dropped.
A network engineer is troubleshooting an issue where IPv6 hosts are unable to perform Duplicate Address Detection (DAD) successfully. The switch is configured with IPv6 First Hop Security features including ND Inspection and ND Suppress. The engineer notices that Neighbor Solicitation messages for DAD are being dropped by the switch. What is the most likely cause?
Explanation: ND Suppress is a feature that suppresses Neighbor Advertisements for addresses that are in the binding table. However, if ND Inspection is misconfigured, it may drop Neighbor Solicitations that are part of DAD because the source address is the unspecified address (::) and the switch may not have a binding for it.
+15 more IPv6 First Hop Security questions available
Practice all IPv6 First Hop Security questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of IPv6 First Hop Security. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
IPv6 First Hop Security questions on the 300-410 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. IPv6 First Hop Security is tested as part of the Cisco CCNP ENARSI 300-410 blueprint. Practicing with targeted IPv6 First Hop Security questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but IPv6 First Hop Security is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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