Which prefix is used for 6over4 addressing?

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Multiple Choice

Which prefix is used for 6over4 addressing?

Explanation:
In 6over4, IPv6 runs over an IPv4 network by using the IPv6 link-local space and encoding the IPv4 address into the IPv6 interface identifier. That means a 6over4 IPv6 address starts with the link-local prefix FE80::/64, and the lower 32 bits (the interface ID) hold the IPv4 address in hexadecimal. FE80::0a0a:0a0a shows this pattern perfectly: the prefix FE80::/64 is used, and the 32-bit tail 0a0a:0a0a encodes IPv4 10.10.10.10. The other options either show just the prefix or a link-local address that doesn’t illustrate the IPv4-embedded tail, so they don’t demonstrate the 6over4 addressing method.

In 6over4, IPv6 runs over an IPv4 network by using the IPv6 link-local space and encoding the IPv4 address into the IPv6 interface identifier. That means a 6over4 IPv6 address starts with the link-local prefix FE80::/64, and the lower 32 bits (the interface ID) hold the IPv4 address in hexadecimal.

FE80::0a0a:0a0a shows this pattern perfectly: the prefix FE80::/64 is used, and the 32-bit tail 0a0a:0a0a encodes IPv4 10.10.10.10. The other options either show just the prefix or a link-local address that doesn’t illustrate the IPv4-embedded tail, so they don’t demonstrate the 6over4 addressing method.

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