What is the software that controls an entire network called?

The software that controls an entire network is referred to as a Network Operating System. This type of system software is specifically designed to manage and coordinate the resources and services of a network, including file sharing, security, and communication between devices. It provides the essential functionality to connect different machines, allows for networked computing, and facilitates communication between users and resources on the network.

Network Operating Systems often include features that support user authentication, resource allocation, and centralized control over network policies. This makes it distinct from a general operating system, which primarily manages a single computer's resources and operations. Thus, the correct identification of a Network Operating System highlights its specialized role in managing networked environments effectively.