Which technique can tunnel IPv6 traffic across an IPv4 infrastructure?
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Correct answer: 6 to 4 tunneling.
Why this is the answer
6to4 tunneling is a specific mechanism designed to encapsulate IPv6 packets within IPv4 packets, allowing IPv6 networks to communicate over an existing IPv4 infrastructure without explicit tunnel brokers. It uses a special IPv6 address prefix (2002::/16) that embeds the IPv4 address of the tunnel endpoint. NAT (Network Address Translation) translates IP addresses but doesn't tunnel different IP versions. L2TPv3 (Layer 2 Tunneling Protocol version 3) tunnels Layer 2 protocols over an IP network, not specifically IPv6 over IPv4. Dual-stack allows a device to run both IPv4 and IPv6 simultaneously but doesn't tunnel one over the other; it requires both protocols to be natively supported on the infrastructure.
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