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网络原理笔记（五层网络）
2022-07-29 08:50:00 【IT技术学习】
1、TCP/UDP与OSI
①物理层(网线)
②数据链路层（mac）
③网络层（IP）
④传输层【端口】（TCP/UDP）
⑤应用层、表示层、会话层：
(通过IP地址和端口进行通讯)
2.理解分层的关系
每一个层级只负责与自己的上下节点通信
3.IP地址
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