讲述了UDP程序的实现方法，并用C语言编程实现了一个UDP程序，该程序能实现广播功能和多播功能，能进行广播消息和多播消息的接发。通过本章的分析，想读者展示了UDP程序的实现过程，广播和多播的区别与共同点-UDP procedures described implementations, and programming using C language, a UDP program, the program can be for broadcast and multicast functions functions, can broadcast messages and send and receive multicast messages. Analysis of this chapter, to show readers the UDP program implementation process, the difference between broadcast and multicast with the common