N10-005 · Question #564
Which of the following is an IPv6 address?
The correct answer is D. 2001:cdba::3257:9652. IPv6 addresses are 128-bit values written as eight groups of four hexadecimal digits separated by colons, and the double-colon notation represents consecutive groups of zeroes.
Question
Which of the following is an IPv6 address?
Options
- A00:14:38:05:7B:E5
- B10.10.1.1
- C192.168.1.1
- D2001:cdba::3257:9652
How the community answered
(47 responses)- A2% (1)
- B2% (1)
- C4% (2)
- D91% (43)
Why each option
IPv6 addresses are 128-bit values written as eight groups of four hexadecimal digits separated by colons, and the double-colon notation represents consecutive groups of zeroes.
00:14:38:05:7B:E5 is a MAC (Media Access Control) address - a 48-bit Layer 2 hardware identifier written in hexadecimal octets separated by colons.
10.10.1.1 is an IPv4 private address using dotted-decimal notation, belonging to the 10.0.0.0/8 RFC 1918 range.
192.168.1.1 is an IPv4 private address in the 192.168.0.0/16 RFC 1918 range, using 32-bit dotted-decimal format.
2001:cdba::3257:9652 is a valid IPv6 address using the standard colon-hexadecimal notation defined in RFC 4291. The double colon (::) is valid shorthand representing one or more consecutive groups of 16-bit zeroes. IPv6's 128-bit address space and hexadecimal colon format clearly distinguish it from IPv4's 32-bit dotted-decimal format.
Concept tested: IPv6 address format and notation recognition
Source: https://www.rfc-editor.org/rfc/rfc4291
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