The first wikipedia article mentions LANS and WANS (local area networks versus wide area networks). It also discusses how changes in computers (specifically the rise of the pc) helped catalyze changes in access, such as the creation of the ethernet cable. The ethernet cable is now most popular, but routers are often used in conjunction with a cable or DSL connection.
The second wikipedia article covers computer networks, which are a series of computers which are interconnected. It covers PANS, LANS, CANS, MANS, WANS, and GANS.
Internetwork: 2or more networks interconnected
Intranet: set of networks under a single administrative identity
extranet: limited in scope to a single organization
Internet: specific internetwork that connects all sorts of areas
hardware: all networks are connected w/ something, (nodes) such as routers, NICs, etc
Remote bridges can be used to create a WAN link between several LANS
Switches: switch!
Routers: connect signal between like and unlike media
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