6 应用层

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6.1 域名系统 DNS

6.1.1 域名系统概述

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6.1.2 互联网的域名结构

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6.1.3 域名服务器

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域名服务器类型

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1 根域名服务器

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2 顶级域名服务器

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3 权限域名服务器

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4 本地域名服务器

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高速缓存

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6.2 文件传送协议

6.2.1 FTP 概述

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没听

6.2.2 FTP 的基本工作原理

6.2.3 简单文件传送协议 TFTP

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6.3 远程终端协议 TELNET

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6.4 万维网 www

6.4.1 万维网概述

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6.4.2 统一资源定位符 URL

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6.4.3 超文本传送协议 HTTP

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没听 ^570a42
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