现在,只有在一些网络软件和硬件组件(例如掩码)的缺少配置参数这些有限的领域里才还使用分类网络这个概念,但是,这个术语在网管员间的讨论中还经常可以听到。The prototype Internet in 1982; note that all the networks (the ovals) have addresses which are single integers; the rectangles are switches.