Cisco 100-105 Exam

Which option is a valid IPv6 address?

  • A. 2001:0000:130F::099a::12a
  • B. 2002:7654:A1AD:61:81AF:CCC1
  • C. FEC0:ABCD:WXYZ:0067::2A4
  • D. 2004:1:25A4:886F::1
Answer: Option D.
Explanation: 

http://www.ipv6.com/articles/general/IPv6-Addressing.htm

IPv6 Address Notation –
IPv6 addresses are denoted by eight groups of hexadecimal quartets separated by colons in between them.
Following is an example of a valid IPv6 address:
2001:cdba:0000:0000:0000:0000:3257:9652
Any four-digit group of zeroes within an IPv6 address may be reduced to a single zero or altogether omitted.
Therefore, the following IPv6 addresses are similar and equally valid:
2001:cdba:0000:0000:0000:0000:3257:9652
2001:cdba:0:0:0:0:3257:9652
2001:cdba::3257:9652
The URL for the above address will be of the form:
http://[2001:cdba:0000:0000:0000:0000:3257:9652]/

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