说明：   本文介绍了用于局域网(LAN)的各种媒体访问方法,传送方法,拓扑,和设备。所讲的题目集中在用于以太网/IEEE 802.3，令牌环/IEEE 802.5，和FDDI(光纤分布式数据接口)。在手册第二部分LAN协议各篇文章中将更详细地讲述具体的协议。
(This article introduces the various media-access methods, transmission methods, topologies, and devices used in a local-area network (LAN). Topics addressed focus on the methods and devices used in Ethernet/IEEE 802.3, Token Ring/IEEE 802.5, and Fiber Distributed Data Interface (FDDI). Subsequent articles in LAN Protocols (Part 2) address specific protocols in more detail. )