transport_layer_session_layer

1.Side note: UDP port 2873 uses the Datagram Protocol, a communications protocol for the Internet network layer, transport layer, and session layer.
附注： UDP端口2873使用数据报协议，一个通信协议的互联网络层，运输层，会话层。
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2.OSI/RM classify the structure of the network into application layer, presentation layer, session layer, transport layer, network layer, data link layer and physical layer.
OSI/RM将计算机网络将网体系结构划分为应用层、表示层、会话层、传输层、网络层、数据链路层和物理层七个层次。
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