广域网在一个广泛的地理范围内所建立的计算机通信网，简称广域网（ＷＡＮ）．其范围可以超越城市和国家，以至于全球，因而对通信的要求及复杂性上都比较高。例如，无论在提高通信效率、通信资源利用率以降低通信成本，或在保证通信质量上均需采取适当措施。同时，在网路... Wide Area Network A computer communications network established within a wide geographical area, referred to as the Wide Area Network (WAN). Its scope can transcend cities and countries, and even the world, and therefore the requirements and complexity of communications are relatively high. For example, appropriate measures need to be taken to improve communication efficiency, utilization of communication resources to reduce communication costs, or to ensure communication quality. At the same time, in the internet ...