Teredo provides full IPv6 connectivity for hosts even if they do not have a native IPv6 network.

Teredo provides full IPv6 connectivity for hosts even if they do not have a native IPv6 network.

• A. Dual Stack
• B. NAT64
• C. 6to4
• D. Teredo

Answer: (D)

Providing IPv6 connectivity when a network lacks native IPv6 requires a tunneling approach that can traverse NAT. Teredo does this by encapsulating IPv6 packets inside UDP over IPv4, allowing a host that only has IPv4 (often behind a NAT) to obtain an IPv6 address and reach IPv6 destinations through Teredo servers and relays. This NAT-traversal capability is what makes Teredo able to offer IPv6 access without a native IPv6 network on the path. Dual stack means the host runs both IPv4 and IPv6 stacks, but it still relies on the network to carry IPv6 traffic; if the path has no IPv6, dual stack won’t help. NAT64 enables IPv6-only clients to reach IPv4 content via translation, not giving IPv6 connectivity to an IPv4-only host. 6to4 tunnels IPv6 over IPv4 but typically requires a routable IPv4 address on the host and doesn’t handle NAT traversal as reliably as Teredo.

Providing IPv6 connectivity when a network lacks native IPv6 requires a tunneling approach that can traverse NAT. Teredo does this by encapsulating IPv6 packets inside UDP over IPv4, allowing a host that only has IPv4 (often behind a NAT) to obtain an IPv6 address and reach IPv6 destinations through Teredo servers and relays. This NAT-traversal capability is what makes Teredo able to offer IPv6 access without a native IPv6 network on the path.

Dual stack means the host runs both IPv4 and IPv6 stacks, but it still relies on the network to carry IPv6 traffic; if the path has no IPv6, dual stack won’t help. NAT64 enables IPv6-only clients to reach IPv4 content via translation, not giving IPv6 connectivity to an IPv4-only host. 6to4 tunnels IPv6 over IPv4 but typically requires a routable IPv4 address on the host and doesn’t handle NAT traversal as reliably as Teredo.