目 录
第 0 章 本书导学 ······························· 1.
0.1 计算机网络的学习方法 ·········· 1.
0.2 计算机网络的重点归纳 ·········· 1.
0.3 本书知识结构 ························· 2.
第 1 章 计算机网络概论 ···················· 3.
1.1 本章导学 ································· 3.
1.1.1 知识结构 ························ 3.
1.1.2 考纲解读 ························ 4.
1.2 知识讲解 ································· 4.
1.2.1 计算机网络概述 ············· 4.
1.2.2 计算机网络体系结构
与参考模型 ····················· 6.
1.2.3 计算机网络性能指标 ··· 10.
1.3 本章小结 ······························· 12.
1.4 本章习题 ······························· 12.
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.
3.2.4 介质访问控制方法 ······ 53.
3.2.5 局域网中的数据
链路层 ·························· 58.
3.2.6 广域网中的数据
链路层 ·························· 62.
3.2.7 数据链路层设备 ·········· 64.
3.2.8 局域网交换机 ·············· 66.
3.2.9 常用的校验方法 ·········· 67.
3.3 本章小结 ······························· 68.
3.4 本章习题 ······························· 68.
3.5 答案与解析 ···························· 71
第 4 章 网络层 ································ 81.
4.1 本章导学 ······························· 81.
4.1.1 知识结构 ······················ 81.
4.1.2 考纲解读 ······················ 82.
4.2 知识讲解 ······························· 82.
4.2.1 网络层功能 ·················· 82.
4.2.2 IP 地址 ························· 83.
4.2.3 网络层协议 ·················· 92.
4.2.4 路由协议 ······················ 95.
4.2.5 IP 组播 ······················· 106.
计算机考研专业课——计算机网络一本通（考点详解＋习题全解）
IV
4.2.6 网络层设备 ················· 106.
4.2.7 互联设备总结 ············· 107.
4.3 本章小结 ····························· 108.
4.4 本章习题 ····························· 108.
4.5 答案与解析 ························· 117.
第 5 章 传输层 ······························ 129.
5.1 本章导学 ····························· 129.
5.1.1 知识结构 ···················· 129.
5.1.2 考纲解读 ···················· 130.
5.2 知识讲解 ····························· 130.
5.2.1 传输层的功能 ············· 130.
5.2.2 传输层的两种服务 ····· 131.
5.2.3 传输层的端口 ············· 132.
5.2.4 UDP ···························· 133.
5.2.5 TCP ····························· 136.
5.2.6 TCP 可靠传输和流量
控制 ···························· 141.
5.3 本章小结 ····························· 146.
5.4 本章习题 ····························· 147.
5.5 答案与解析 ························· 153.
第 6 章 应用层 ······························ 160.
6.1 本章导学 ····························· 160.
6.1.1 知识结构 ···················· 160.
6.1.2 考纲解读 ···················· 161.
6.2 知识讲解 ····························· 161.
6.2.1 端系统的通信模型 ···· 161.
6.2.2 DNS 系统 ··················· 161.
6.2.3 文件传输协议 ············ 165.
6.2.4 电子邮件 ···················· 166.
6.2.5 万维网（WWW） ····· 168.
6.3 本章小结 ····························· 171.
6.4 本章习题 ····························· 171.
6.5 答案与解析 ·························· 174.
第 7 章 网络安全··························· 181.
7.1 本章导学 ····························· 181.
7.1.1 知识结构 ···················· 181.
7.1.2 考纲解读 ···················· 182.
7.2 知识讲解 ····························· 182.
7.2.1 计算机网络通信面临
的威胁 ························ 182.
7.2.2 加密的一般过程 ········ 183.
7.2.3 数字签名 ···················· 184.
7.2.4 鉴别 ···························· 185.
7.2.5 密钥管理 ···················· 186.
7.2.6 防火墙 ························ 187.
7.3 本章小结 ····························· 188.
7.4 本章习题 ····························· 188.
7.5 答案与解析 ·························· 18 9
