1.5 答案与解析 ··························· 16.
第 2 章 物理层 ································ 23.
2.1 本章导学 ······························· 23.
2.1.1 知识结构 ······················ 23.
2.1.2 考纲解读 ······················ 24.
2.2 知识讲解 ······························· 24.
2.2.1 数据通信的基础
知识 ······························ 24.
2.2.2 奈奎斯特定理与香农
定理 ······························ 27.
2.2.3 物理层设备 ··················· 30.
2.2.4 数据交换技术 ··············· 31.
2.2.5 物理层的接口特性 ······· 33.
2.3 本章小结 ······························· 33.
2.4 本章习题 ······························· 34.
2.5 答案与解析 ··························· 39.
第 3 章 数据链路层 ························· 47.
3.1 本章导学 ······························· 47.
3.1.1 知识结构 ······················ 47.
3.1.2 考纲解读 ······················ 48.
3.2 知识讲解 ······························· 48.
3.2.1 数据链路层的功能 ······ 48.
3.2.2 数据链路层三个基本
问题 ······························ 49.
3.2.3 流量控制与可靠
传输机制 ······················ 50.

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