Cisco Certified Network Associate (CCNA) 1 v7.0 Practice Test

The classification of private IPv4 address ranges is defined by the Internet Engineering Task Force (IETF) within RFC 1918. These addresses are used for internal networks and are not routable on the public internet, allowing organizations to utilize them without conflicting with global addresses.

The range from 10.0.0.0 to 10.255.255.255 represents a Class A private address space, offering a large pool of addresses suitable for extensive networks.

Similarly, the range of 172.16.0.0 to 172.31.255.255 consists of Class B private addresses, providing a balance between the number of addresses and the ease of management for medium-sized networks.

Finally, the range from 192.168.0.0 to 192.168.255.255 represents Class C private addresses, which are commonly used for smaller networks such as home and small business networks.

Because all three specified ranges are designated as private, they collectively ensure organizations can design their networks without overlapping with public IP addresses, enabling internal communication without requiring internet connectivity. Thus, acknowledging that all these ranges are private confirms their validity in being used internally without conflict with external addressing.