20+ practice questions focused on IPv6 Traffic Filtering and uRPF — 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 Traffic Filtering and uRPF PracticeA network engineer is troubleshooting a connectivity issue between two routers R1 and R2 connected via GigabitEthernet0/0. The engineer notices that R1 can ping its own IPv6 address 2001:db8:1::1/64, but cannot ping R2's interface address 2001:db8:1::2/64. The output of 'show ipv6 interface GigabitEthernet0/0' on R1 indicates that IPv6 is enabled and the interface is up/up. The engineer checks the access list applied to the interface and sees an inbound IPv6 ACL that permits only ICMPv6 echo requests from a specific source. What is the most likely cause of the ping failure?
Explanation: The inbound ACL on R1 is blocking the ICMPv6 echo reply from R2, because the ACL only permits echo requests from a specific source, not replies. For a successful ping, both the echo request and echo reply must be permitted. The reply is sourced from R2's address, which is not matched by the permit statement.
A network engineer is troubleshooting a BGP IPv6 peering issue between two routers, R1 and R2, connected via a point-to-point link. The engineer notices that the BGP session is flapping with error 'BGP Notification sent: 3/2 (Update malformed)'. The engineer checks the IPv6 ACL applied to the interface on R1 and sees an inbound ACL that permits only TCP port 179 from the neighbor's link-local address. The BGP peering uses the global unicast addresses of the interfaces. What is the most likely cause of the BGP session failure?
Explanation: The BGP session is flapping because the inbound ACL on R1 permits only TCP port 179 traffic sourced from the neighbor's link-local address, but the BGP peering is configured using global unicast addresses. Therefore, TCP packets from R2's global unicast address are dropped by the ACL, causing the BGP session to fail with a 'Notification sent: 3/2 (Update malformed)' error, as the TCP connection cannot be established or maintained.
A network engineer is troubleshooting an IPv6 routing issue on a router that is receiving OSPFv3 routes from multiple neighbors. The engineer notices that some routes are missing from the routing table. The engineer checks the interface configuration and finds an inbound IPv6 ACL applied to the interface that permits only specific prefixes. The engineer also notices that the missing routes are from a neighbor that is sending routes with a prefix length of /48, while the ACL permits only /64 prefixes. What is the most likely cause of the missing routes?
Explanation: The inbound IPv6 ACL on the interface is filtering OSPFv3 routes based on prefix length. Since the ACL permits only /64 prefixes, any routes with a /48 prefix length are denied and not installed in the routing table. This is the most likely cause of the missing routes.
A network engineer is troubleshooting a connectivity issue where a host on VLAN 10 cannot reach a server on VLAN 20. Both VLANs are on the same switch, which is running IPv6. The engineer checks the switch and finds that uRPF (unicast Reverse Path Forwarding) is enabled in strict mode on the VLAN 20 interface. The host's IPv6 address is 2001:db8:10::100/64, and the server's address is 2001:db8:20::200/64. The switch has a default route pointing to a next-hop router. The host sends traffic to the server, but the switch drops the packets. What is the most likely cause?
Explanation: With uRPF strict mode enabled on the VLAN 20 interface, the switch checks that the source IP address of incoming packets (2001:db8:10::100) is reachable via the same interface on which the packet arrived. Since the switch only has a default route pointing to a next-hop router and no specific route for the 2001:db8:10::/64 subnet pointing back to the VLAN 10 interface, the FIB lookup for the source address fails the strict uRPF check, causing the switch to drop the packet.
A network engineer is troubleshooting an IPv6 connectivity issue on a router that is receiving routes via EIGRP for IPv6. The engineer notices that some routes are not being installed in the routing table, even though the EIGRP neighbor relationship is established. The engineer checks the interface configuration and finds an inbound IPv6 ACL that permits only certain EIGRP packets. The ACL permits EIGRP hello packets and updates, but not EIGRP queries or replies. What is the most likely cause of the missing routes?
Explanation: EIGRP for IPv6 uses multicast address FF02::A for all EIGRP packets, including hello, update, query, and reply. The ACL permits only hello and update packets, blocking query and reply packets. EIGRP requires query and reply packets for the Diffusing Update Algorithm (DUAL) to converge and install routes; without them, the router cannot complete the route installation process, even though the neighbor relationship is established.
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Practice all IPv6 Traffic Filtering and uRPF questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of IPv6 Traffic Filtering and uRPF. 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 Traffic Filtering and uRPF 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 Traffic Filtering and uRPF is tested as part of the Cisco CCNP ENARSI 300-410 blueprint. Practicing with targeted IPv6 Traffic Filtering and uRPF questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but IPv6 Traffic Filtering and uRPF 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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