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网络协议 - 雪地
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<h1>网络协议</h1>
<div class="read-more clearfix">
<span class="date">2016/1/29 18:40 下午</span>
<span>posted in </span>
<span class="posted-in"><a href='TCPIP.html'>TCP/IP</a></span>
<span class="comments">
</span>
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<p>连接不同的计算机是非常有必要的，能够大幅度提升工作效率。</p>
<p>比如：一个工作需要经过三个步骤，分别是步骤A/步骤B/步骤C。三个步骤分别由三台不同的计算机A/B/C执行。</p>
<pre><code class="language-flow">com_A=>operation: 计算机A
com_B=>operation: 计算机B
com_C=>operation: 计算机C
com_A->com_B->com_C
</code></pre>
<span id="more"></span><!-- more -->
<p>起初，人们使用容量极小的3.5寸盘，带着要处理的数据来到计算机A面前，执行完之后带着数据分别去B和C前进行操作处理，十分的低效。</p>
<pre><code class="language-flow">com_A=>operation: 计算机A
com_B=>operation: 计算机B
com_C=>operation: 计算机C
ip=>inputoutput: 用户数据
op=>inputoutput: 数据输出
ip->com_A->com_B->com_C->op
</code></pre>
<p>使用网络连接三台计算机之后，用户可以在A处理完数据，直接传递给B和C进行处理，再将处理结果传回A即可。</p>
<pre><code class="language-flow">com_A=>operation: 计算机A
ip=>inputoutput: 用户数据
op=>inputoutput: 数据输出
ip->com_A->op
</code></pre>
<p>甚至，进一步的发展之后，用户都拥有了自己的计算机，则用户可以在任意一台连接了A的计算机上，比如自己的电脑，直接将数据传递到A、B、C计算机上处理，而无需离开自己的计算机进行操作。这一步的发展，即是当前的互联网。</p>
<pre><code class="language-flow">com_A=>operation: 任一联网计算机
ip=>inputoutput: 用户数据
op=>inputoutput: 数据输出
ip->com_A->op
</code></pre>
<p>但是现实中，计算机不仅只由一家公司开发，不同公司的计算机起初只能与自家的计算机进行连接。不同种的计算机无法进行连接交流。就像语言不通的外国人，无法交流。</p>
<p>于是，为了连接不同种类计算机，我们统一了计算机交流的语言。由此，无论你的结构与其他计算机有多不同，只要能够使用这种统一语言，就能加入到互联网这个大聊天室之中，与任何计算机进行通信交流。</p>
<p>这种统一的语言，就是『协议』。</p>
<p>由于各种机缘巧合，TCP/IP协议成为了世界上主流的网络通信协议。</p>
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