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One is a functional definition and the other is a technical
definition.
The former defines a LAN as a group of desktop computers and other
devices that are not physically separated from one another to allow
users to interconnect systems that allow users to communicate with
each other and share computing resources such as printers and
storage devices. This definition applies to LANs used in office
environments, factories, and research institutes. (emphasis on
outside behavior and services)
For the technical definition of a LAN, it is defined as a computer
that is interconnected by specific types of transmission media
(such as cables, optical cables, and wireless media) and network
adapters (also known as network cards) and is monitored by the
network operating system. system. (emphasis is on the material
basis and composition required to make up the LAN)