Which of the following commonly is used to classify networks?

The classification of networks typically depends on several criteria, one of which is the types of devices connected to the network. This categorization helps determine how the network functions and what protocols are necessary. For example, a network consisting of computers, servers, printers, and other devices can be classified based on whether it is a local area network (LAN), wide area network (WAN), or a metropolitan area network (MAN).

Different types of devices might indicate the primary purpose of the network, like a home network that connects personal devices versus a business network that connects office equipment and workstations. Identifying the devices also helps in understanding the network's architecture and its operational characteristics.

Other options, such as the distance between the computer and the server, do play a role in network performance or design considerations but are not the primary basis for classifying networks. Similarly, the number of users and the speed of the network connection can inform the type of service or capabilities required but do not fundamentally categorize the network itself. Thus, recognizing the types of devices connected provides a clearer context for the network's structure and intended use.