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D. all of the mentioned
In computer networks, nodes refer to any physical device that’s connected to the network and can send, receive, or forward information. This includes computers, printers, switches, and routers, among other devices. Each node in the network has a unique identifier, such as an IP address, that allows it to communicate with other nodes across the network. Nodes can be categorized by their roles and functionalities within the network, such as end nodes (like computers and printers) that initiate and terminate communication, and intermediary nodes (like routers and switches) that facilitate the transfer of data.