Software that controls an entire network is called what?

The correct answer is the Network Operating System. This type of software is specifically designed to manage and control network resources, allowing multiple devices to communicate with each other effectively. It handles tasks such as data management, resource allocation, and user access, enabling users to connect to shared resources like printers, files, and applications over a network.

A Network Operating System also provides network services to clients, facilitating efficient communication and centralized control over various network activities. This includes managing network security, user accounts, and network protocols to ensure smooth operations within the network environment.

In contrast, a server generally refers to a machine or computer that provides services, such as hosting applications or managing resources, but does not encompass the broader functionality of controlling the entire network. A client refers to devices that access services from a server but does not handle network management. Application software is designed for specific tasks that end-users perform and does not deal with the control of network operations. Thus, the Network Operating System is essential for integrating and managing all aspects of network functionality, making it the most accurate choice.