前言利用中继器可增加以太网的网络直径,前提是该网络直径不得超过以太网的冲突域。作为中继器的另一种选择,现介绍一种转换(器)的概念。转换器不仅增加了网络的直径,而且还能改善网络的性能。分级设备尽管转换集线器(switching hub)外观上与转发集线器(repeating hub)非常相似,但它们属于不同类型的设备。若你了解OSI通信模型,你就会注意到对应于不同通信服务的不同层。 Preface Making use of repeaters increases the network diameter of an Ethernet network, provided that the network diameter does not exceed the Ethernet collision domain. As an alternative to repeaters, we introduce the concept of a translator. Converters not only increase the diameter of the network, but also improve the performance of the network. Hierarchical Devices Although switching hubs are very similar in appearance to repeating hubs, they belong to different types of devices. If you understand the OSI communication model, you will notice the different layers that correspond to different communication services.