What is the correct format for an IPv4 address mapped into IPv6?
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A. B. C. D.B
The correct format for an IPv4 address mapped into IPv6 is option B, which is ::FFFF:192.168.0.1.
IPv6 uses a 128-bit address space and IPv4 uses a 32-bit address space. In order to support the transition from IPv4 to IPv6, a mechanism called IPv4-mapped IPv6 addresses was introduced.
An IPv4-mapped IPv6 address is an IPv6 address that starts with ::FFFF:0:0/96. The last 32 bits of the IPv6 address represent the 32-bit IPv4 address. In other words, an IPv4 address is mapped into the IPv6 address.
In the example given in option B, the IPv4 address 192.168.0.1 is mapped into an IPv6 address by placing the IPv4 address in the last 32 bits of the IPv6 address. The resulting IPv6 address is ::FFFF:192.168.0.1.
Option A is not a valid IPv4-mapped IPv6 address because it does not include the ::FFFF:0:0/96 prefix.
Option C is not a valid IPv4-mapped IPv6 address because it uses the reserved FFFE value in the middle, which is used for other purposes in IPv6 addressing.
Option D is not a valid IPv4-mapped IPv6 address because it includes a port number, which is not part of an IPv6 address.