说明：  用TCPIP进行网际互联第三卷：客户——服务器编程与应用：Linux／Posix和 TCP/IP协议一样是一套经典的协议书籍。
(TCPIP used for internetworking Volume III : Customer-- Server and Application Programming : Linux/Posix and the TCP/IP protocol is the same set of classic books on the agreement.)