What is the IPv6 prefix used for 6over4 addressing?

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Multiple Choice

What is the IPv6 prefix used for 6over4 addressing?

Explanation:
6over4 places IPv6 on an IPv4 link by using the IPv6 link-local prefix FE80::/64 and encoding the IPv4 address in the lower 32 bits of the IPv6 address. That means a 6over4 address on the link would look like FE80::X.Y.Z.W, with the IPv4 address X.Y.Z.W written in hex in the last 32 bits. For IPv4 address 10.10.10.10 that hex is 0a0a:0a0a, giving FE80::0a0a:0a0a. This is why that choice is the best one. The other options don’t show the IPv4-embedded form on the correct prefix (they either show a generic or different mapping) and thus don’t represent a valid 6over4 address mapping.

6over4 places IPv6 on an IPv4 link by using the IPv6 link-local prefix FE80::/64 and encoding the IPv4 address in the lower 32 bits of the IPv6 address. That means a 6over4 address on the link would look like FE80::X.Y.Z.W, with the IPv4 address X.Y.Z.W written in hex in the last 32 bits. For IPv4 address 10.10.10.10 that hex is 0a0a:0a0a, giving FE80::0a0a:0a0a. This is why that choice is the best one. The other options don’t show the IPv4-embedded form on the correct prefix (they either show a generic or different mapping) and thus don’t represent a valid 6over4 address mapping.

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