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Network security is the process by which data, applications, and devices on computer networks are protected. Computer networks have evolved rapidly and are typically classified by their geographical coverage. Local area networks (LANs) are used within a building or set of buildings and are owned and operated by a specific organization. Although initially LANs were physically constructed using wires that connected each computing device and each peripheral device, such as a printer, wireless LANs are now more frequently used. These operate over unregulated radio spectrum to connect devices in a more flexible and less costly manner. Wide area networks (WANs) interconnect LANs in geographically disparate locations and are usually developed and operated by telecommunications companies and governments. Organizations typically lease circuits from telecommunications companies to ...

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