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ＴＬＩ是ＩＳＯ－ＯＳＩ模型的传输层的一个编程界面，支持网络中两个用户进程间的数据传送。ＴＬＩ为应用开发提供了两种服务方式：连接方式和无连接方式。前者适宜于要求较大数据量，面向数据流交互的应用程序；后者适合于含有短小快速请求／响应交互的应用程序。本文详细讨论了ＴＬＩ的无连接方式服务和在应用开发过程中必须解决的几个问题。
TLI is a programming interface to the transport layer of the ISO-OSI model that supports data transfer between two user processes in the network. TLI provides two service modes for application development: connection mode and connectionless mode. The former is suitable for applications that require a large amount of data for data flow interaction; the latter is suitable for applications that contain short quick request / response interaction. This article discusses in detail TLI’s connectionless service and several issues that must be addressed during application development.