Cisco Certified Network Associate (CCNA) Practice Exam

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How many binary bits are represented by each hexadecimal digit in an IPv6 address?

2 bits
4 bits
8 bits
16 bits

The correct answer is: 4 bits

Each hexadecimal digit in an IPv6 address represents 4 binary bits. This is because hexadecimal is a base-16 numbering system, while the binary system is base-2. Each digit in hexadecimal can represent values from 0 to 15, which translates to binary as a sequence of 4 bits. For example, the hexadecimal digit 'A' corresponds to the binary sequence '1010'. In the context of IPv6, which uses the hexadecimal format extensively, there are a total of 8 groups of 4 hexadecimal digits, resulting in a substantial address space. Therefore, understanding the correspondence of 1 hexadecimal digit to 4 binary bits is fundamental to comprehending IPv6 addressing and manipulation.