Which technology enables seamless transition from IPv4 to IPv6 networks?

The technology that enables a seamless transition from IPv4 to IPv6 networks is 6to4. This mechanism provides a way for IPv6 packets to be transmitted over an IPv4 network by encapsulating the IPv6 packets within IPv4 packets. By doing so, it facilitates communication between IPv4-only devices and those that have transitioned to IPv6, effectively allowing them to coexist and communicate during the transition period.

The 6to4 protocol automatically assigns an IPv6 address based on an IPv4 address, which helps in simplifying the addressing scheme while leveraging existing IPv4 infrastructure. This bridging is crucial as the world moves towards the adoption of IPv6, ensuring that organizations and individuals can communicate without interruption during the transition phase.

Other technologies mentioned, like Teredo, also facilitate IPv6 transition but they operate under different circumstances, such as crossing NAT (Network Address Translation) devices. Dynamic ARP Inspection and DHCP Snooping are security features used within IPv4 networks to mitigate certain types of attacks on the network layer; they do not address the transition between IPv4 and IPv6. Understanding these distinctions helps clarify why 6to4 is the most appropriate choice for enabling a smooth transition between the two protocols.