IPv6 questions test address types (global unicast, link-local, multicast, anycast), address assignment (SLAAC, DHCPv6, EUI-64), OSPFv3, and dual-stack. The CCNA often presents an IPv6 address and asks you to identify the prefix, type, or calculate the EUI-64 interface ID.
Start Scenario PracticeConsider the following DHCPv6 configuration on router R2: ipv6 dhcp pool DHCP6_POOL dns-server 2001:db8::1 domain-name example.com ! interface GigabitEthernet0/0 ipv6 address 2001:db8:1::1/64 ipv6 dhcp server DHCP6_POOL ipv6 nd other-config-flag no shutdown What is the effect of this configuration?
Explanation: The configuration uses the `ipv6 nd other-config-flag` command, which sets the 'Other Configuration' flag (O-flag) in Router Advertisement (RA) messages. This tells hosts to use Stateless Address Autoconfiguration (SLAAC) for their IPv6 address (based on the prefix in the RA) and then use DHCPv6 (stateless DHCPv6) only to obtain additional parameters like DNS server and domain name, as defined in the DHCPv6 pool.
Drag and drop the steps to verify and validate IPv6 traffic filtering and uRPF operational state into the correct order, from first to last.
Explanation: Validation begins with checking the uRPF configuration on the interface, then verifying the interface status, inspecting uRPF statistics, testing connectivity with ping, and finally confirming the routing table for expected routes.
A network engineer runs the following command on Router R1: R1# show ipv6 interface tunnel 0 Tunnel0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::1 Global unicast address(es): 2001:DB8:2::1, subnet is 2001:DB8:2::/64 Joined group address(es): FF02::1 FF02::2 ICMP redirects are enabled ICMP unreachables are enabled ND DAD is enabled, number of DAD attempts: 1 ND reachable time is 30000 milliseconds IPv6 uRPF: loose mode (allow default route) Based on this output, what is the uRPF configuration on this interface?
Explanation: The output explicitly shows 'IPv6 uRPF: loose mode (allow default route)', which confirms that unicast Reverse Path Forwarding (uRPF) is enabled in loose mode. In loose mode, the router checks that the source address of an incoming packet has a matching entry in the routing table, but it does not require the incoming interface to match the best return path. This is distinct from strict mode, which requires both a routing table entry and that the incoming interface is the same as the outgoing interface for the return route.
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.
Which IPv6 access-list entry will deny traffic from any source to the destination prefix 2001:db8:1::/48?
Explanation: The IPv6 access-list entry 'deny ipv6 any 2001:db8:1::/48' uses the correct syntax: the source is 'any' (all traffic), and the destination is the prefix 2001:db8:1::/48, which matches all addresses within that /48 range. This entry denies traffic from any source to the entire destination prefix, as required by the question.
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Practice all IPv6 Configuration ScenariosIPv6 questions test address types (global unicast, link-local, multicast, anycast), address assignment (SLAAC, DHCPv6, EUI-64), OSPFv3, and dual-stack. The CCNA often presents an IPv6 address and asks you to identify the prefix, type, or calculate the EUI-64 interface ID. These appear throughout the 300-410 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 300-410. Practicing each scenario type ensures you're ready for any format.
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