Cisco Certified Network Associate (CCNA) Practice Exam

How many groups of hexadecimal digits exist within an IPv6 address?

1. 4 groups

2. 8 groups

3. 10 groups

4. 16 groups

The correct answer is: 8 groups

An IPv6 address consists of eight groups of hexadecimal digits. Each group is 16 bits long, and together, these groups make up the complete 128-bit address. The structure of an IPv6 address is presented in eight blocks, separated by colons, which allows for a more efficient representation of IP addresses compared to the older IPv4 system. This format not only accommodates a vastly larger number of addresses but also introduces shorthand notations for simplifying writing and reading these addresses, such as omitting leading zeros or collapsing contiguous groups of zeros. It is essential to understand that the eight groups are fundamental to the structure and design of IPv6 as a whole.