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<time title="创建时间:2019-08-21 00:00:20 / 修改时间:00:20:08" itemprop="dateCreated datePublished" datetime="2019-08-21T00:00:20+08:00">2019-08-21</time>
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<h3 id="连接–连接万物"><a href="#连接–连接万物" class="headerlink" title="连接–连接万物"></a>连接–连接万物</h3><hr>
<h5 id="当网线将一台电脑彼此连接之时,PC终于不再孤单,从有线到无线,从PC到移动,从电脑到电器,万物的互联才形成了如今的万千气象"><a href="#当网线将一台电脑彼此连接之时,PC终于不再孤单,从有线到无线,从PC到移动,从电脑到电器,万物的互联才形成了如今的万千气象" class="headerlink" title="当网线将一台电脑彼此连接之时,PC终于不再孤单,从有线到无线,从PC到移动,从电脑到电器,万物的互联才形成了如今的万千气象"></a>当网线将一台电脑彼此连接之时,PC终于不再孤单,从有线到无线,从PC到移动,从电脑到电器,万物的互联才形成了如今的万千气象</h5><hr>
<p>通讯,交流始终是人类社会不可剥离的属性,古人相互交流发明语言,让人与人可以互相理解。快马驿站开始突破区域的限制,工业革命后电话的使用让信息传输的可靠性和有效性得到保证。然而,只有互联网的兴起,才让信息的传输脱离语言的描述变得丰富多彩。但无论如何变化,交流的本质未变,连接+协议+信息</p>
<p>没有网络连接的世界里,每一台电脑就是一个孤岛,而当网络连接起这里的每一个孤岛时,每个孤岛都有了属于自己的一个独一无二的编号–IP,当然,为了方便人类的识别,他们也拥有了自己的名称–域名。</p>
<blockquote>
<p>此处IP代表实体IP</p>
</blockquote>
<p>有了IP,连接才有了方向,如同写信需要收信人和寄信人的地址,在互联网中流转的每一条信息,他们会带上来源IP和目标IP,在浩瀚的网络中游荡。当然,如果互联网的使用者能记住每一个节点的IP的话,那么就没有域名什么事儿了。我们打开Google,只会使用Google.com这样人类才懂的名称,如同我们想要去一个地方旅游,我们会说想要去巴黎,马尔代夫,上海,而不会精确的知道我要去东经XX,北纬XX这样的地方。实际的过程其实也只是我们带上目的地名称,乘坐交通工具,在现实的空间中流转。那么在虚拟的网络世界里,消息就是一群群漂泊的旅客,包就像是交通工具,路由如同是交通调度中心,完成一次次旅程。</p>
<p>寻找则是旅程的第一步,每一台机器都有自己的一个通讯录,会记录有限的域名和实际的IP,我们称之为hosts。99%的情况下,这份单薄的通讯录没有任何的帮助。于是我们需要求助于这一个片区里最懂路的家伙(LDNS),他很熟路,所以80%的情况下,我们就会得到答案(IP),可以直奔目的地。</p>
<p>如果比较不幸的是我们的地址LDNS也没搞清楚是哪里的话,不用着急,我们拥有的详细地址足以让他去寻找,<a href="http://www.baidu.com" target="_blank" rel="noopener">www.baidu.com</a> 这样一个域名就如同现实世界的X国X省XX县…… LDNS会去全球的根域名服务(Root Server)开始第一次查找(轻车熟路),这些互联网世界的元老们当然记不住一个个小兵的名字,但他们知道你所需要的地方首先是在何处被登记(gTLD Server),好吧,LDNS需要再去找到gTLD Server,这个级别的服务器全球分布的也并不多,他只会记住这个域名具体在何处被登记并上报,所以LDNS又得到一个地址(Name Server),他是这个地方对外的第一位向导,也许他已经知道具体的地址,又或许他也只是听另一位向导描述过这个地方,那么他只能给LDNS下一个向导的地址,开始兜兜转转……</p>
<p>LDNS只要不是一个傻子,这么颠沛流离的过程他一定不会再有一次,于是一番周折后终于打听到实际地址他会牢牢记下来,为了下一次还有人问路时,他可以爽快直接的告诉他,这个地方,哥知道!</p>
<p>通过LDNS的帮助,我们总算是知道了真正该去往何处,但是路途遥远,人生地不熟。幸而网络的世界里有路由的存在,它们如同这个世界的车站一般,相互之间错综复杂的连接成一道网,只需要带上我们的地址,它自会安排我们每一个人最终到达目的地,当然这个过程我们会被安排分开做上不同的交通工具开始远行,最终在终点汇合(TCP&UDP)</p>
<p>完成这次旅程,才算的上真正的连接。</p>
<p>端与端 依靠一次次的走出去,走进来,形成了如今这磅礴浩瀚的互联网江湖</p>
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<time title="创建时间:2019-08-12 23:21:15 / 修改时间:23:25:18" itemprop="dateCreated datePublished" datetime="2019-08-12T23:21:15+08:00">2019-08-12</time>
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<h2 id="何为"><a href="#何为" class="headerlink" title="何为"></a>何为</h2><p>这是一个知识爆炸的年代,各种付费知识平台的发展开始竞争每一个上班通勤族的碎片时间,每日仿佛不刷一两个小课都对不起自己在地铁上闲的蛋疼的时光,然而在碎片时间里学习,如果没有一个系统的目标,那和在碎片时间里消遣没有什么两样,短时间的大脑皮层刺激丝毫不会固化下来,时间一久,反而会陷入一种为何天天都在学习却一段时间下来发现什么都没有学会的挫败感。</p>
<p>笔记才能让那些一闪而过的思绪化成文字固化在时光中……</p>
<p>工作的日益繁忙反而容易让人陷入一种奇怪的忙碌充实却又麻木的状态里,在没着没落里一步一步的趋向焦虑,却又本能的以矫情为借口拒绝从这滩泥淖中走出来。</p>
<p>每次站在地铁里,拿出手机会手足无措,放下手机却是一团麻木,回到家中,满眼的技术书却也竟然无一处下手,惶提其他的诸如三国西游之类年少时好读不可释手之书,中年技术人的技术焦虑竟然恐怖如斯</p>
<p>好在不久前偶读到耗子老叔的一篇文章,其内提到的要坚持写笔记的习惯当时扎实的戳心了,总说自己没时间,又在麻木忙碌里荒芜时间。其实真的并不是没有时间,如同今晚,本想写一篇小技术博,写了一半便删,删了之后却又毫无头绪的重写,反反复复竟也快接近睡觉之时,终究还是需要重头再来,首先去拾起旧日之心态</p>
<p>无以复返,则砥砺当下,行此文以自勉吧</p>
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