IPv6 Practice Test 2026 – Your Comprehensive All-in-One Guide to Success!

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Which IPv6 transition component synthesizes IPv6 addresses from IPv4 A records to reach IPv4 hosts?

NAT64

DNS64

DNS64 is the component that creates IPv6 addresses from IPv4 A records to reach IPv4 hosts. In an IPv6 network that needs to contact an IPv4-only host, DNS64 intercepts a DNS query for the host’s AAAA record. If there’s no native IPv6 address, DNS64 uses the IPv4 address from the A record and embeds it into an IPv6 address using the well-known 64:ff9b::/96 prefix. This synthesized IPv6 address is returned to the client, which then sends its traffic through a NAT64 translator that converts the IPv6 packets to IPv4. The other options serve different roles: NAT64 performs the actual IPv6-to-IPv4 translation, while SLAAC and DHCPv6 handle how hosts configure addresses and options, not the synthesis of IPv6 addresses from IPv4 data.

SLAAC

DHCPv6