所谓计算机网络就是用线路将计算机、打印机等设备连接在一起，实现文件数据、硬件设备等资源的共享。计算机网络可以从一间办公室内少量用户的对等网络到使用永久敷设的电缆、光缆和电话线路连接大量用户的局域网，以及把分布在广大地域上的若干不同网络连接起来的广域网、城? The so-called computer network is the line with computers, printers and other devices connected together to achieve the file data, hardware devices and other resources to share. A computer network can connect a large number of users ’LANs from a small number of users’ peer-to-peer networks in an office to permanently wired cables, fiber optic cables and telephone lines, and to a wide area network that connects several different networks distributed over a wide area.