传输控制协议是一种面向连接的、可靠的、基于字节流的运输层通信协议.在简化的计算机网络OSI模型中,它完成第四层传输层所指定的功能,UDP是同一层内另一个重要的传输协议.-Transmission Control Protocol is a connection-oriented, reliable byte stream transport layer communication protocol in the simplified OSI model of computer network, it completed the functions specified in the fourth layer of the transport layer, UDP is the same floor Another important transport protocol.