A local area network is used to connect an organization's computers to one another; nevertheless, a single organization often includes several local area networks, so it is sometimes necessary to link the networks together. In such a case, specialized equipment is needed.
If it's just two networks of the same type, all that is needed is to send the data frames from one to the other. Otherwise, that is, when the networks use different protocols, you need to convert the protocol before sending the frames. For this reason, the equipment that must be installed varies depending on the configuration at hand.
The primary hardware set up in local area networks is: