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 PracticeWhich TWO statements about IPv4 and IPv6 ACLs are true?
Explanation: Extended IPv4 ACLs filter on source and destination IP addresses, ports, and protocols, so placing them as close to the source as possible prevents unwanted traffic from traversing the network, reducing bandwidth waste and security risks. This is a best practice for extended ACLs, unlike standard ACLs which should be placed close to the destination.
A network administrator is troubleshooting an IPv6 connectivity issue on a newly deployed router. The router's G0/0/0 interface is configured with an IPv6 address using EUI-64, but hosts on that subnet cannot reach the router's link-local address. The administrator runs 'show ipv6 interface g0/0/0' and sees that the interface is up/up but the IPv6 address is not in the expected format. What is the most likely cause of the problem?
Explanation: The router's G0/0/0 interface is up/up, but the IPv6 address is not in the expected EUI-64 format. This indicates that the 'ipv6 address' command was likely omitted entirely, because if it were simply misconfigured (e.g., without the `eui-64` keyword), the router would still automatically generate a link-local address, and hosts would be able to reach it. Since hosts cannot reach the link-local address, IPv6 is not enabled on the interface at all. The correct configuration requires the `ipv6 address` command with the appropriate prefix and the `eui-64` keyword.
An IPv6 host successfully reaches neighbors on its local segment, but it cannot reach remote IPv6 destinations. The host has a global unicast address and a correct prefix length. Which missing item is the strongest suspect?
Explanation: The strongest suspect is the absence of a usable default router learned through IPv6 router advertisements or equivalent configuration. While local connectivity works because the host can communicate on its own link, remote IPv6 destinations require a next hop off the local segment. Option B is wrong because IPv6-to-IPv4 NAT is unnecessary for native IPv6 communication and would not be the primary cause of off-link failure. Option C is wrong because a VLAN trunk on the host NIC is for carrying multiple VLANs, not for enabling off-link routing. Option D is wrong because a second global unicast address does not provide a default route; it only adds another local address.
Which IPv6 address type is automatically created on an interface and used for communication on the local link only?
Explanation: Every IPv6-enabled interface generates a link-local address, typically in the FE80::/10 range. It is used for neighbor discovery, local communication, and next-hop resolution on the same link.
Two directly connected routers running OSPFv3 do not form an adjacency. Both interfaces have valid IPv6 addresses and can ping each other using link-local addresses. What is the most likely cause?
Explanation: The most likely cause is an OSPFv3 area mismatch on the interface. In practical terms, OSPFv3 still requires neighbors on the same link to agree on the area assignment, just as OSPF for IPv4 does. Link-local reachability alone is not enough to form an adjacency. The protocol parameters still have to match. This is an important IPv6 routing point because people sometimes assume that successful IPv6 ping means the routing protocol should automatically work. It does not. Adjacency depends on protocol alignment, not just basic connectivity.
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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 200-301 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 200-301. Practicing each scenario type ensures you're ready for any format.
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