本章展示一些典型的计算机网络应用程序，并且讨论了，作为一个网络设计者希望支持诸如此类的应用程序，必须要注意的需求。
This chapter looks at some typical applications of computer networks and discusses the requirements that a network designer who wishes to support such applications must be aware of.
前端由客户机计算机（或企业的计算机网络）和用来访问云的应用程序组成。
The front end is composed of a client computer, or the computer network of an enterprise, and the applications used to access the cloud.
在计算机网络中，端口就是作为会话端点的应用程序特定的或进程特定的软件概念。
In computer networking, a port is an application-specific or process-specific software construct serving as a communications endpoint.
计算机网络最初建造是为了专用目的的程序硬件，并且他们并没有被优化，从应用程序，例如打电话、发送电视信号。
Computer networks are built primarily from general-purpose programmable hardware, and they are not optimized from application like making calls or delivering television signals.
本书适用于希望理解TCP/TP协议如何实现的人，包括编写网络应用程序的程序员以及利用TCP/IP维护计算机网络的系统管理员。
This book is hope that the understanding of TCP/TP protocol how people, including programmers who write Web applications and the use of TCP/IP to maintain the computer network system administrator.
本书适用于希望理解TCP/TP协议如何实现的人，包括编写网络应用程序的程序员以及利用TCP/IP维护计算机网络的系统管理员。
This book is hope that the understanding of TCP/TP protocol how people, including programmers who write Web applications and the use of TCP/IP to maintain the computer network system administrator.
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