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  What is Computer Network? - A computer network is a set of computers sharing resources located on or provided by network nodes. Computers use common communication protocols over digital interconnections to communicate with each other. LAN(Local Area Network) PAN(Personal Area Network) MAN(Metropolitan Area Network) WAN(Wide Area Network) LAN(Local Area Network) -A local area network (LAN) is a collection of devices connected together in one physical location, such as a building, office, or home. -A LAN can be small or large, ranging from a home network with one user to an enterprise network with thousands of users and devices in an office or school. - a LAN's single defining characteristic is that it connects devices that are in a single, limited area.  PAN(Personal Area Network) -A personal area network (PAN) connects electronic devices within a user's immediate area. The size of a PAN ranges from a few centimeters to a few meters. - PAN network connections can either be wir