第三卷的内容细节覆盖了当今TCP/IP编程人员和网络管理员必须熟练掌握的四个基本方面： T/TCP (TCP事务协议),这是对TCP的扩展，使客户--服务器间的事务传输更快更有效和更可靠； HTTP (超文本传送协议)，这是飞速扩展中的万维网的基础； NNTP (网络新闻传送协议)，这是Usennet新闻系统的基础； UNIX域协议，这是在UNIX实现中应用非常广泛的一套协议。-third volume of the details of today's coverage of TCP/IP programmers and network administrators must be familiar to the four basic areas : T/TCP (TCP services agreements), which is the expansion of TCP, enabling customers-- server affairs transmission faster and more efficient and more reliable; HTTP (hypertext transfer protocol), which is the rapid expansion of the World Wide Web; NNTP (Network News Transfer Protocol), which is Usennet the basis of information systems; UNIX domain agreement, which is the realization of UNIX application of a very broad agreement.