Question

.......... conected computer in a one building​

Answer 1

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A local-area network (LAN) is a computer network that spans a relatively small area. Most often, a LAN is confined to a single room, building or group of buildings, however, one LAN can be connected to other LANs over any distance via telephone lines and radio waves.

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Answer 2

Answer:

I think electricity it is only source for contacting our computers to the building