知道端口知识

当我们听到他们说21端口，dns，ftp，等一些列端口的时候我们时候真正的认识网络中端口的常识呢?那就看看这个端口仅仅吧，里边富含网络端口常识的介绍！

(When we hear them say 21 ports, dns, ftp, and other serial ports, do we really understand the common sense of ports in the network? Let's take a look at this port only, which is rich in the introduction of common sense of network ports!)

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