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hcip第一天总结
2022-06-10 00:18:00 【xnasda】
网络基础：
OSI模型
应用层 人机交互— 抽象语言 编码
表示层 编码二进制
会话层 提供会话地址，应用程序内部地址—没有统一标准
传输层 分段（受MTU限制）提供端口号 TCP/UDP
网络层 IP—互联网协议 路由器
数据链路层 逻辑链路控制层（LLC）+ 介质访问控制层（MAC）控制硬件 交换机
物理层 硬件
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