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运输层是因特网协议栈的第四层,它肩负着是否保证可靠通信及通信效率和复用的重任,是一种端到端协议。运输层有两个基本协议,即传输控制协议TCP(Transmission Control Protocol)和用户数据报协议UDP(User Datagram Protocol)。虽然两者都可以提供逻辑通道的复用功能以提高通信效率,但是TCP协议是一种可靠传输服务协议,是一种面向连接的协议过程,而UDP协议是一种非可靠传输服务协议,是一种无连接协议过
The transport layer is the fourth layer of the Internet protocol stack. It shoulders the task of ensuring efficiency and reuse of reliable communications and communications. It is an end-to-end protocol. The transport layer has two basic protocols: Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). Although both of them can provide the logical channel multiplexing function to improve the communication efficiency, TCP is a reliable transport service protocol and is a connection-oriented protocol. UDP protocol is an unreliable transport service protocol and is A connectionless protocol