Fe80::2AA;FF:FE 28: 9C 5A is a valid IPv6 address.

• A. True
• B. False
• C. Not sure
• D. Not applicable

Answer: (A)

IPv6 addresses are written as eight 16-bit hexadecimal blocks separated by colons, and they can use a double colon to compress a run of zero-valued blocks. They also often use an EUI-64 style interface identifier, where FF FE is inserted in the middle of the MAC-derived bits to form the lower 64 bits. In this example, the address begins with Fe80, which is a classic link-local prefix used on a single network segment. The double colon after Fe80 means one or more 0000 blocks have been collapsed there. The remaining explicit blocks are 2AA, FF, FE, 28, 9C, and 5A. That gives seven explicit blocks, so exactly one 0000 block is omitted by the compression, which is valid for an IPv6 address. The FF FE portion in the middle indicates the common EUI-64 formatting used to generate the interface ID. When written with proper punctuation, Fe80::2AA:FF:FE:28:9C:5A, this is a valid IPv6 address. The original semicolon and spacing are formatting quirks; the underlying pattern follows IPv6 rules.