百度官方：CDN对网站在搜索引擎中的影响
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">什么是CDN</strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">CDN的全<span style="color: black;">叫作</span>是Content Delivery Network，即内容分发网络。CDN的通俗理解<span style="color: black;">便是</span>网站加速，CPU<span style="color: black;">平衡</span>负载，<span style="color: black;">能够</span><span style="color: black;">处理</span>跨运营商，跨地区，服务器负载能力过低，带宽过少等带来的网站打开速度慢等问题。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">CDN的基本思路是尽可能避开互联网上有可能影响数据传输速度和稳定性的瓶颈和环节，使内容传输的更快、更稳定。<span style="color: black;">经过</span>在网络各处<span style="color: black;">安置</span>节点服务器所<span style="color: black;">形成</span>的在现有的互联网<span style="color: black;">基本</span>之上的一层智能虚拟网络，CDN系统能够实时地<span style="color: black;">按照</span>网络流量和各节点的连接、负载<span style="color: black;">情况</span>以及到用户的距离和响应时间等综合信息将用户的请求重新导向离用户<span style="color: black;">近期</span>的服务节点上。其目的是<span style="color: black;">运用</span>户可就近取得所需内容，<span style="color: black;">处理</span> Internet网络拥挤的<span style="color: black;">情况</span>，<span style="color: black;">加强</span>用户<span style="color: black;">拜访</span>网站的响应速度。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">源自</span>：百度站长平台</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">近期平台社区策划了一场关于网站该<span style="color: black;">不应</span>用 CDN 的大讨论，77.43%的用户都认为应该用，<span style="color: black;">然则</span>一部分用户纠结于<span style="color: black;">倘若</span>用了 CND 之后<span style="color: black;">针对</span>搜索引擎会不会产生<span style="color: black;">消极</span>的影响。学院结合百度 spider 工作原理以及百度工程师<span style="color: black;">意见</span>，整理<span style="color: black;">文案</span>如下，供广大站长学习：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">CDN能够<span style="color: black;">运用</span>户可就近取得所需内容，<span style="color: black;">处理</span> Internet网络拥挤的<span style="color: black;">情况</span>，<span style="color: black;">加强</span>用户<span style="color: black;">拜访</span>网站的响应速度。<span style="color: black;">那样</span>对搜索引擎有什么影响呢？</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">首要</span><span style="color: black;">咱们</span>看下社区用户的看法：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">【正方观点】</span></strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">1、<span style="color: black;">提高</span>网站加载速度：CDN<span style="color: black;">经过</span>缓存技术<span style="color: black;">提高</span>网站打开速度，便于蜘蛛快速抓取和爬行</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2、<span style="color: black;">提高</span>网站安全性：<span style="color: black;">隐匿</span>真实网站ip，防御针对服务器IP的攻击和<span style="color: black;">各样</span>探测扫描，避免被黑</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">3、<span style="color: black;">提高</span>网站稳定性：CDN的ip遍布全国，<span style="color: black;">倘若</span><span style="color: black;">显现</span>局部地区网络问题，不会影响搜索引擎抓取</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">4、<span style="color: black;">提高</span>网站用户体验：CDN<span style="color: black;">提高</span>用户的打开体验，对<span style="color: black;">提高</span>排名<span style="color: black;">亦</span>有<span style="color: black;">必定</span>的<span style="color: black;">功效</span></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">【反方观点】</span></strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">1、抓取数据下降：CDN ip的多样性，部分ip可能对蜘蛛并不友好；</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2、缓存<span style="color: black;">引起</span>数据陈旧：CDN的缓存特性，<span style="color: black;">引起</span>部分地区可能内容更新<span style="color: black;">区别</span>步；</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">3、服务商优劣参杂：<span style="color: black;">由于</span>服务商的实力<span style="color: black;">区别</span>，可能会<span style="color: black;">引起</span>CDN系统不稳定，反而产生<span style="color: black;">消极</span>影响</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">4、本地网站无需CDN：部分网站只服务本地，只要机房<span style="color: black;">亦</span>在本地，无需<span style="color: black;">运用</span>CDN。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">综合双方观点来看，<span style="color: black;">大众</span>的争议点<span style="color: black;">重点</span>集中在CDN的多ip入口和缓存机制会不会对搜索引擎抓取、网站排名产生<span style="color: black;">有害</span>影响。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">从搜索抓取机制上讲：Baiduspider对站点的抓取方式和普通用户<span style="color: black;">拜访</span><span style="color: black;">同样</span>，只要普通用户能<span style="color: black;">拜访</span>到的内容，<span style="color: black;">咱们</span>就能抓取到。不管是用什么技术，只要能<span style="color: black;">保准</span>用户能流畅的<span style="color: black;">拜访</span>网站，对搜索引擎就<span style="color: black;">无</span>影响。而缓存技术<span style="color: black;">提高</span>了打开速度和用户体验，这<span style="color: black;">亦</span>是百度搜索引擎<span style="color: black;">始终</span>所倡导的，<span style="color: black;">那样</span><span style="color: black;">为何</span>还是有<span style="color: black;">有些</span>网站<span style="color: black;">运用</span>CDN后产生了<span style="color: black;">消极</span>影响。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">咱们</span>对百度工程师进行了<span style="color: black;">关联</span>咨询，<span style="color: black;">重点</span>有两方面的<span style="color: black;">原因</span>：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">一是部分CDN服务商硬件投入<span style="color: black;">不足</span>，经常<span style="color: black;">显现</span>不稳定<span style="color: black;">状况</span>，<span style="color: black;">引起</span>蜘蛛返回<span style="color: black;">海量</span>503内容，<span style="color: black;">引起</span>了抓取量的下降，有的<span style="color: black;">乃至</span>影响了索引量的影响；<span style="color: black;">因此</span><span style="color: black;">选取</span>有实力的CDN服务商很重要！</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">二是缓存机制在网站<span style="color: black;">显现</span>死链、<span style="color: black;">没法</span>打开、被黑等<span style="color: black;">状况</span>的时候起到了推波助澜的<span style="color: black;">功效</span>。<span style="color: black;">短期</span>内产生了<span style="color: black;">有些</span><span style="color: black;">有害</span>快照，影响了排名。<span style="color: black;">然则</span>这种<span style="color: black;">状况</span><span style="color: black;">不消</span>担心，<span style="color: black;">即时</span>清理源文件和CDN缓存，并在站长平台提交<span style="color: black;">关联</span>死链数据等<span style="color: black;">办法</span>进行挽回，是<span style="color: black;">能够</span>恢复到原来的<span style="color: black;">状况</span>的！</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">参考资料</span></strong><span style="color: black;">：以下内容由百度开放云<span style="color: black;">供给</span></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">网站要不要用CDN？</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">画了一张朴（很）素（low）的图<span style="color: black;">帮忙</span><span style="color: black;">大众</span>来<span style="color: black;">认识</span>业务<span style="color: black;">是不是</span>适合<span style="color: black;">运用</span>CDN</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz/fbac17wmeIEUYaX9y9KcibZ6I4BrjpN6gevXiaRriaPAJeRHhcaQr18PXzvNiapEC2SYf6kIgAj7neQInwF62dWrdQ/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"><span style="color: black;">以静态请求<span style="color: black;">来讲</span>，流量命中率越高的业务越适合用CDN，<span style="color: black;">此时</span>成本越低，加速效果越好</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">以动态请求<span style="color: black;">来讲</span>，<span style="color: black;">通常</span>不适合用CDN，经过CDN会<span style="color: black;">增多</span>链路的时间开销。除非CDN有动态加速功能<span style="color: black;">保准</span>CDN的链路<span style="color: black;">选取</span>最优。这种<span style="color: black;">状况</span>下<span style="color: black;">选取</span><span style="color: black;">运用</span>动态加速功能，带来的好处是源站只需要单线<span style="color: black;">安排</span>，由CDN实现更<span style="color: black;">繁杂</span>网络的接入。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">注：流量命中率=（（（CDN出流量-<span style="color: black;">出现</span>回源的出流量）/CDN出流量）*100）%</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">画了一张朴（很）素（low）的图<span style="color: black;">帮忙</span><span style="color: black;">大众</span>来<span style="color: black;">认识</span>什么是流量命中率，这是CDN非常重要的一个指标，流量命中率越高<span style="color: black;">寓意</span>着加速效果越好，花的钱越少。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz/fbac17wmeIEUYaX9y9KcibZ6I4BrjpN6gxgQ2LHDRloeDpNzmkfDVMObuPky44xR0eEy2FdQJGGVTyFPpicZ8HoQ/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"><span style="color: black;"><span style="color: black;">亦</span>许<span style="color: black;">此时</span>候你会问我的内容是静态的<span style="color: black;">亦</span>很hot，那我<span style="color: black;">是不是</span>就<span style="color: black;">必定</span>要用CDN了呢。答案是不<span style="color: black;">必定</span>。还有一个至关重要的<span style="color: black;">原因</span>是成本。CDN的成本降低是在最大化<span style="color: black;">保准</span>用户体验的<span style="color: black;">状况</span>下成本最优（好拗口）</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">简言之<span style="color: black;">针对</span><span style="color: black;">有些</span>对成本非常<span style="color: black;">敏锐</span>，不追求极致的用户体验的<span style="color: black;">机构</span>，CDN未必是一个好的<span style="color: black;">选取</span>。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">举个栗子，一个小型的创业游戏<span style="color: black;">机构</span><span style="color: black;">运用</span>CDN的<span style="color: black;">重点</span>场景的是游戏下载，<span style="color: black;">因为</span><span style="color: black;">处在</span>创业<span style="color: black;">周期</span>，对成本非常<span style="color: black;">敏锐</span>，<span style="color: black;">同期</span>认为在当前<span style="color: black;">周期</span>下<span style="color: black;">能够</span>牺牲用户体验，<span style="color: black;">她们</span><span style="color: black;">最后</span>并<span style="color: black;">无</span><span style="color: black;">选取</span><span style="color: black;">运用</span>CDN，而是直接购买了1Gbps的带宽并进行限速，<span style="color: black;">这般</span>的<span style="color: black;">选取</span>是<span style="color: black;">她们</span>的成本从每月12万元<span style="color: black;">上下</span>降低到5万元<span style="color: black;">上下</span>。<span style="color: black;">然则</span>CTO<span style="color: black;">亦</span>坦言这是特殊<span style="color: black;">周期</span>不得不做出牺牲用户体验的<span style="color: black;">选取</span>，后面仍然会<span style="color: black;">思虑</span><span style="color: black;">运用</span>CDN。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">结论</span></strong><span style="color: black;">：<span style="color: black;">倘若</span>您要<span style="color: black;">保准</span>网站<span style="color: black;">拜访</span>体验最优化，网站<span style="color: black;">拜访</span>很热的静态内容是非常适合<span style="color: black;">运用</span>CDN的。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">1.<span style="color: black;">提高</span><span style="color: black;">拜访</span>速度</span></strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">运用</span>CDN后全国的<span style="color: black;">拜访</span>速度-平均传输速度5.76MB/s </span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz/fbac17wmeIEUYaX9y9KcibZ6I4BrjpN6gfRjdVMKHibibkic0UicEUSjtWCW2ulenxHWW0WTgcmYfECjUVpyyogLrkw/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">运用</span>CDN前全国<span style="color: black;">拜访</span>速度-平均下载速度590KB/s </span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz/fbac17wmeIEUYaX9y9KcibZ6I4BrjpN6gJCshG4EnvtREtvwvtMa6Cb3RxrNjLu8F8VKBbgS7zzjGbialaaaoqtQ/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">2.降低带宽成本</span></strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">前面<span style="color: black;">说到</span>，在<span style="color: black;">保准</span><span style="color: black;">拜访</span>效果最优的<span style="color: black;">状况</span>下，<span style="color: black;">运用</span>CDN降最大程度的降低带宽成本和人力<span style="color: black;">守护</span>成本</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">3.减轻源站压力</span></strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">运用</span>CDN以后，一个带宽峰值100Gbps<span style="color: black;">上下</span>的大型站点基本只需要<span style="color: black;">守护</span>带宽峰值在1~2Gbps<span style="color: black;">上下</span>的源站<span style="color: black;">就可</span>。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">4.<span style="color: black;">隐匿</span>源站，<span style="color: black;">加强</span>源站抗攻击能力</span></strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">因为</span>CDN<span style="color: black;">隐匿</span>了源站的真实IP以及CDN天然的抗攻击能力，<span style="color: black;">运用</span>CDN后，源站的安全性会大幅<span style="color: black;">提高</span>。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><a style="color: black;"><span style="color: black;"><span style="color: black;"><img src="http://mmbiz.qpic.cn/mmbiz/fbac17wmeIHK6gVpvFSOC5ncL9MicCROLDy2auicdsyt2dLoZo6wADtDwAzfUmzz8wuFRg6hIBhRynQPoSdxkVjg/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></span></a></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">更加多</span>SEO<span style="color: black;">文案</span>精选，请点击阅读：</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><a style="color: black;"><span style="color: black;">SEO | <span style="color: black;">资讯</span>源站点防止被黑经验分享</span></a></p>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><a style="color: black;">四两拨千斤，快速<span style="color: black;">增多</span>万级日均SEO流量的思路与案例</a></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz/fbac17wmeIF4YcTS7ibr8X8V3YuX1qQ0ibXsFMCJUQdNickU8N1j3GeupZrfDLqgqEGrYYJTdAEyltHFCcfj2MnRw/0?wx_fmt=gif&tp=webp&wxfrom=5&wx_lazy=1" style="width: 50%; margin-bottom: 20px;"></p>
我完全赞同你的观点，思考很有深度。
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