Cisco Certified Network Associate (CCNA) Practice Exam

Which of the following approaches is NOT used when migrating from an IPv4 addressing scheme to an IPv6 scheme?

1. Dual-stack routing

2. Configure IPv4 tunnels between IPv6 islands

3. Port forwarding

4. Proxying and translation to translate IPv6 packets into IPv4 packets

The correct answer is: Port forwarding

When migrating from an IPv4 addressing scheme to an IPv6 scheme, various approaches facilitate the transition while ensuring that both protocols can coexist and communicate as needed. The correct answer highlights a method not typically associated with this migration process. Dual-stack routing allows a network to run both IPv4 and IPv6 simultaneously, enabling devices to communicate using either protocol without disrupting existing services. This approach is essential during the transition as it accommodates both addressing schemes. Configuring IPv4 tunnels between IPv6 islands is another common method where encapsulation techniques create paths for IPv6 packets to travel over an IPv4 infrastructure. This supports interoperability across networks that have not yet fully transitioned to IPv6. Proxying and translation involve mechanisms like NAT64, which enable IPv6 devices to communicate with IPv4 resources by translating and proxying the packets. This method is instrumental in helping the old and new addressing schemes interact. In contrast, port forwarding is not a recognized approach specifically employed during the migration from IPv4 to IPv6. It is primarily a technique used in network address translation to redirect traffic from one IP address and port combination to another, typically within the same IPv4 address space. While port forwarding has its merits in IPv4 environments, it doesn't directly aid in the transition to IPv