Which term describes any entity on a network that can be managed, such as a router or firewall?

The term that accurately describes any entity on a network that can be managed, such as a router or firewall, is "node." In networking terminology, a node refers to any device that is connected to a network and is capable of sending, receiving, or forwarding information. This encompasses a broad range of devices, including routers, switches, firewalls, and even computers.

Understanding that nodes can include both end devices and network infrastructure is key. For instance, while a client is a device like a personal computer that seeks resources or services from a server, and a server is a device that provides those resources or services, nodes encompass all managed devices in the context of the network. Similarly, a switch is a specific type of node that connects devices on a local area network (LAN) and directs data traffic between them.

This comprehensive definition of a node makes it clear why it is the correct answer. Nodes are integral to the functioning of a network, facilitating communication and management of data flow.