National or
Global ISP
Mobile Network
Local or
Regional ISP
Home Network
Enterprise Network
Figure 1.10 The network core
A computer network is a collection of interconnected devices that can communicate with each other to exchange data, resources, and services. These devices can include computers, servers, routers, switches, and other networking hardware and software. Computer networks can be classified based on their size and geographic scope, ranging from small local area networks (LANs) to large wide area networks (WANs) that span multiple cities, countries or even continents.
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