“`” 考察点：网络七层模型
运输层，网络层，应用层。
<font color=""#333333"" face=""system, -apple-system, BlinkMacSystemFont, Helvetica Neue, Helvetica, PingFang SC, Segoe UI, Microsoft YaHei, wenquanyi micro hei, Hiragino Sans GB, Hiragino Sans GB W3, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Arial, sans-serif""><span style=""font-size: 14px;"">七层结构：物理层、数据链路层、网络层、传输层、会话层、表示层、应用层</span></font>
<font color=""#333333"" face=""system, -apple-system, BlinkMacSystemFont, Helvetica Neue, Helvetica, PingFang SC, Segoe UI, Microsoft YaHei, wenquanyi micro hei, Hiragino Sans GB, Hiragino Sans GB W3, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Arial, sans-serif""><span style=""font-size: 14px;"">tcp属于传输层；http属于应用层。</span></font>
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<pre><code> "“`
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