LFCS · Question #57
Which of the following is a valid IPv6 address?
The correct answer is A. 2001:db8:3241::1. This question tests the understanding of IPv6 address syntax rules, including the use of hexadecimal digits and the single double-colon abbreviation.
Question
Options
- A2001:db8:3241::1
- B2001::db8:4581::1
- C2001:db8:0g41::1
- D2001%db8%9990%%1
- E2001.db8.819f..1
How the community answered
(50 responses)- A92% (46)
- B2% (1)
- C4% (2)
- D2% (1)
Why each option
This question tests the understanding of IPv6 address syntax rules, including the use of hexadecimal digits and the single double-colon abbreviation.
This is a valid IPv6 address; it uses correct hexadecimal digits and employs a single double-colon (::) to represent a block of zero segments, which is a permissible abbreviation.
An IPv6 address can contain only one double-colon (::) abbreviation, but this address has two, making it invalid.
The segment `0g41` is invalid because 'g' is not a valid hexadecimal digit (which must be 0-9 and a-f).
IPv6 addresses use colons (:) as segment separators, not percentage signs (%), making this format incorrect.
IPv6 addresses use colons (:) as separators, not dots (.), and the `..` notation for abbreviation is incorrect; only `::` is valid.
Concept tested: IPv6 address syntax rules
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/ipv6/ipv6-overview#ipv6-addressing
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