The first generation of computer networks required very expensive ($1,000 or more) network adapters to connect a PC to a Network server. Below is an example; this IRMA Network adapter was used to connect a PC to an IBM mainframe server at a cost of over $1,000 and if you needed to connect to a different type of server, you had to purchase a different (and very costly interface adapter.   Today a network adapter for wired or wireless PCs are a miniature by comparison cost $30 or less and these network adapters can be used to connect to any type of hardware equipment.     Explain what changed:

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Network transmission cabling

A network is a collection of devices connected by communication links. A device can be a computer or any instrument capable of sending and receiving data or information formed by other nodes toward the network. A channel that connects people or things is known as a network. It sends the data from one place to another. It is the basic concept of a computer, network, and data communications.