CompTIA Network+ Practice Test

Classes of IP addresses are primarily based on what?

1. The number of devices that can connect to a network

2. The effectiveness of the address in routing traffic

3. The number of bits dedicated to the host address

4. The geographical area the address covers

The correct answer is: The number of bits dedicated to the host address

The classification of IP addresses is primarily based on the number of bits dedicated to the host address component within the overall address structure. This classification defines how many bits are available for identifying devices on a network versus how many bits are used for specifying the network itself. For instance, in classful addressing, different classes (A, B, C, D, and E) allocate varying numbers of bits for the network and host portions. This affects the maximum number of hosts that can be created in each class and determines the size of the network. In Class A, for example, 7 bits are used for the network and 24 bits for the host, allowing for a large number of hosts (up to 16,777,214) on fewer networks. In contrast, Class C dedicates 24 bits for the host, limiting the number of hosts (up to 254) but allowing for a greater number of networks. While other factors may influence the effectiveness or practicality of IP addressing (such as routing efficiency and geographical considerations), these are secondary to the foundational aspect of how the address space is split between network and host, which is what drives the classification system.