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1什么是端口让我先从因特网提供的一些常见的服务说起。说到服务,我们首先要明白“连接”和“无连接”的概念。最简单的例子莫过于打电话和写信。两个人如果要通电话,得首先建立连接——即拔号,等待应答后才能相互传递信息,最后还要释放连接——即挂电话。写信就没有那复杂了,
1 What is a port Let me start with some of the common services provided by the Internet. When it comes to service, we first need to understand the concepts of “connected” and “disconnected.” The simplest example is to call and write a letter. If two people want to make a phone call, they must first establish a connection - that is, dial-up, wait for a reply before they can pass information to each other, and finally release the connection - that is, hang up. It is not complicated to write a letter