Question 827 of 952 from exam 200-125: Cisco Certified Network Associate Exam

# Question 827 of 952 from exam 200-125: Cisco Certified Network Associate Exam

### Question

Which option is a valid IPv6 address?

### Explanations

A. B. C. D.

D

Option D, 2004:1:25A4:886F::1, is a valid IPv6 address.

IPv6 addresses are 128-bit addresses, which are represented using 8 groups of 16-bit hexadecimal values separated by colons. Each group can have leading zeros removed, and a sequence of consecutive 0 groups can be represented with two colons (::). However, the use of double colons (::) can only be used once in an IPv6 address to represent consecutive 0s.

Let's break down the given options to see which one is a valid IPv6 address:

Option A, 2001:0000:130F::099a::12a, is not a valid IPv6 address because it has two sets of double colons (::) which is not allowed in an IPv6 address.

Option B, 2002:7654:A1AD:61:81AF:CCC1, is a valid IPv6 address because it consists of 8 groups of 16-bit hexadecimal values separated by colons, and there are no consecutive 0s that need to be represented using double colons (::).

Option C, FEC0:ABCD:WXYZ:0067::2A4, is not a valid IPv6 address because it has a group (WXYZ) that consists of non-hexadecimal values.

Therefore, the correct answer is Option D, 2004:1:25A4:886F::1, because it is a valid IPv6 address that consists of 8 groups of 16-bit hexadecimal values separated by colons, and there is one set of double colons (::) representing consecutive 0s.