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 PracticeAn IPv6-enabled host is trying to discover the MAC address of another host on the same link. The host knows the destination IPv6 address but does not have a corresponding entry in the neighbor cache. Which protocol and message type does the host use?
Explanation: When an IPv6 host needs to resolve a known destination IPv6 address to its MAC address on the same link, it sends a Neighbor Solicitation (NS) message, which is ICMPv6 type 135. This message is multicast to the solicited-node multicast address of the target, and the host with that IPv6 address responds with a Neighbor Advertisement (ICMPv6 type 136) containing its MAC address. This process replaces ARP in IPv4 and is defined in RFC 4861.
Which THREE of the following are characteristics of IPv6? (Select exactly three.)
Explanation: IPv6 was designed without a built-in requirement for Network Address Translation (NAT) because its vast 128-bit address space allows every device to have a globally unique public IP address. Unlike IPv4, which relies on NAT to conserve limited address space, IPv6 restores end-to-end connectivity by default, eliminating the need for address translation at the network edge.
Which DNS record type is used to map a domain name to an IPv6 address?
Explanation: The AAAA record is used for IPv6 address mapping.
Which DNS record type is used to map a domain name to an IPv6 address?
Explanation: The AAAA (quad-A) record is the DNS resource record type defined in RFC 3596 to map a fully qualified domain name to a 128-bit IPv6 address. Unlike the A record, which stores a 32-bit IPv4 address, the AAAA record holds the longer IPv6 address, enabling clients to resolve hostnames to IPv6 destinations.
A network administrator is configuring a DNS server. Which TWO DNS record types are used for IPv6 address resolution?
Explanation: The AAAA record (option D) maps a hostname to a 128-bit IPv6 address, analogous to the A record for IPv4. The PTR record (option C) performs reverse DNS lookup, mapping an IPv6 address to a hostname, which is essential for IPv6 address resolution in scenarios like logging or mail server verification.
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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 200-901 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 200-901. Practicing each scenario type ensures you're ready for any format.
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