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\chapter{基于套接字的网络程序设计}
\label{chap:program}
本单元通过编写简单的UDP应用程序和适配常见应用层协议的TCP应用程序使学生能熟练掌握基本套接字编程，
熟悉HTTP与SMTP等应用层协议，
从而深入理解理解跨网络进程通信的原理和过程，
培养开发网络应用程序的能力。
