It is a computer network, the distance between computers is considerably less. This distance factor is now not important, technologies exist, by which I can physically spread my LAN across continents.
The LAN technology "was" used to network local machines.
The media used to be "shared" - means, there are many NODES, which CONTENT for the MEDIA.
These CAPITALIZED phrases are important.
NODES - computers or other devices or hosts which need to participate in the network
CONTENT - since the media is shared, a node has to "own" the media before it can "talk". Multiple nodes will compete with each other to "own" the media and there should be some logic to gain ownership
MEDIA - is used by the nodes to send/receive data
The most popular LAN technolgy today is ETHERNET. In the beginning, ETHERNET used coaxial cable as the media. There will be one coaxial cable running from one end of the floor to the other. Computers needing connection to the network will TAP the cable using a T connector.
Ethernet uses CSMA/CD to ACCESS the medium.
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