A LAN is a system of computers and associated peripherals such as Printers that are physically connected by cable within a limited geographical area-typically in an office building or on a college campus.

• 局域网就是在一个有限的地域范围内，典型的如在办公大楼或校园中，将计算机及相关外设(如打印机)用电缆进行物理连结而组成的一个系统。