Identify a valid IPv6 address from the options.

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Multiple Choice

Identify a valid IPv6 address from the options.

Explanation:
In IPv6, addresses are written as eight 16‑bit blocks, each shown in hexadecimal and separated by colons. A block can have 1 to 4 hex digits, and leading zeros can be kept or omitted. A address may also use a shorthand (::) to replace consecutive zero blocks, but that shorthand is optional and used to compress the length. The first option has eight blocks, each exactly four hex digits, and all characters are valid hex digits (0–9 and a–f). This is a fully expanded, standard IPv6 address, with no compression needed, so it clearly meets the format requirements. The second option is in IPv4 notation (dots separating decimal numbers), so it isn’t an IPv6 address. The third option shows only two blocks separated by a colon, which is not enough blocks for an IPv6 address unless there were a shorthand to replace the missing sections—but there isn’t one here, so it’s not a valid IPv6 form. The fourth option uses the :: shorthand to compress zeros. That is allowed in IPv6, but it can make interpretation less immediate, and in this context the fully expanded form is the clearest valid example.

In IPv6, addresses are written as eight 16‑bit blocks, each shown in hexadecimal and separated by colons. A block can have 1 to 4 hex digits, and leading zeros can be kept or omitted. A address may also use a shorthand (::) to replace consecutive zero blocks, but that shorthand is optional and used to compress the length.

The first option has eight blocks, each exactly four hex digits, and all characters are valid hex digits (0–9 and a–f). This is a fully expanded, standard IPv6 address, with no compression needed, so it clearly meets the format requirements.

The second option is in IPv4 notation (dots separating decimal numbers), so it isn’t an IPv6 address.

The third option shows only two blocks separated by a colon, which is not enough blocks for an IPv6 address unless there were a shorthand to replace the missing sections—but there isn’t one here, so it’s not a valid IPv6 form.

The fourth option uses the :: shorthand to compress zeros. That is allowed in IPv6, but it can make interpretation less immediate, and in this context the fully expanded form is the clearest valid example.

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