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.

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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.

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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.

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