Using 6to4, the IPv6 address derived from 10.10.10.10 is which?

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Multiple Choice

Using 6to4, the IPv6 address derived from 10.10.10.10 is which?

Explanation:
6to4 addresses use the 2002::/16 prefix and embed the IPv4 address in hex as the next 32 bits, split into two 16-bit blocks. Take the IPv4 10.10.10.10, convert to hex: 0a0a0a0a. Split into two 16-bit pieces: 0a0a and 0a0a. Place these directly after the 2002 prefix, with the remaining bits as zeros to fill to 128 bits. That gives a 6to4 address on the form 2002:0a0a:0a0a:0000:0000:0000:0000:0000, which is commonly written in compressed form as 2002::0a0a:0a0a (the two 0a0a blocks appearing after the ::). Therefore, the address derived from 10.10.10.10 is represented by the option that shows the embedded hex blocks 0a0a:0a0a after the 2002 prefix.

6to4 addresses use the 2002::/16 prefix and embed the IPv4 address in hex as the next 32 bits, split into two 16-bit blocks. Take the IPv4 10.10.10.10, convert to hex: 0a0a0a0a. Split into two 16-bit pieces: 0a0a and 0a0a. Place these directly after the 2002 prefix, with the remaining bits as zeros to fill to 128 bits. That gives a 6to4 address on the form 2002:0a0a:0a0a:0000:0000:0000:0000:0000, which is commonly written in compressed form as 2002::0a0a:0a0a (the two 0a0a blocks appearing after the ::). Therefore, the address derived from 10.10.10.10 is represented by the option that shows the embedded hex blocks 0a0a:0a0a after the 2002 prefix.

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