Which prefix is used for IPv4-mapped IPv6 addresses?

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Multiple Choice

Which prefix is used for IPv4-mapped IPv6 addresses?

Explanation:
IPv4-mapped IPv6 addresses are formed by fixing the first 96 bits and placing the 32-bit IPv4 address in the low-order bits. The standard representation is ::ffff:IPv4-address, which corresponds to a 96-bit prefix of ::ffff/96. So this prefix indicates that the address is an IPv4 address embedded in IPv6 space. That’s why this option is the correct one: the ::ffff/96 prefix is specifically designated for IPv4-mapped IPv6 addresses. The other prefixes serve different purposes—2002::/16 is for 6to4 transitions, fe80::/10 is for link-local addresses, and 198.18.0.0/15 is reserved for testing inter-networking—so they don’t denote IPv4-mapped IPv6 addresses.

IPv4-mapped IPv6 addresses are formed by fixing the first 96 bits and placing the 32-bit IPv4 address in the low-order bits. The standard representation is ::ffff:IPv4-address, which corresponds to a 96-bit prefix of ::ffff/96. So this prefix indicates that the address is an IPv4 address embedded in IPv6 space.

That’s why this option is the correct one: the ::ffff/96 prefix is specifically designated for IPv4-mapped IPv6 addresses. The other prefixes serve different purposes—2002::/16 is for 6to4 transitions, fe80::/10 is for link-local addresses, and 198.18.0.0/15 is reserved for testing inter-networking—so they don’t denote IPv4-mapped IPv6 addresses.

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