<section class="section" id="infra__section_myz_qxs_wtb"><h2 class="doc-tairway">原理流程图解</h2> <div class="p"> <img class="image" id="infra__image_qpx_qpr_2sb" src="https://obs-cn-shanghai.fincloud.pinganyun.com/pacloud/20222309105759-1ec6033f93aa.jpg" width="600"> </div> </section> <section class="section" id="infra__section_nyz_qxs_wtb"><h2 class="doc-tairway">原理流程说明</h2> <ol class="ol" id="infra__ol_jrv_k4c_c5b"> <li class="li">终端向<strong class="ph b">【本地域名服务器】</strong>查询应用服务域名<strong class="ph b">www.example.com</strong>。</li> <li class="li">假设<strong class="ph b">【本地域名服务器】</strong>没有<strong class="ph b">example.com</strong>的缓存，那么<strong class="ph b">【本地域名服务器】</strong>会向【<strong class="ph b">根域名服务器</strong>】发送请求查询 <strong class="ph b">.com</strong>的<strong class="ph b">【顶级域名服务器】</strong>地址。</li> <li class="li"><strong class="ph b">【根域名服务器】</strong>告知<strong class="ph b">.com</strong>的<strong class="ph b">【顶级域名服务器】</strong>地址。</li> <li class="li"><strong class="ph b">【本地域名服务器】</strong>向<strong class="ph b">.com</strong>的<strong class="ph b">【顶级域名服务器】</strong>查询.<strong class="ph b">example.com</strong>的<strong class="ph b">【权威域名服务器】</strong>地址。</li> <li class="li"><strong class="ph b">.com</strong>的<strong class="ph b">【顶级域名服务器】</strong>告知.<strong class="ph b">example.com</strong>的<strong class="ph b">【</strong><strong class="ph b">权威</strong><strong class="ph b">域名服务器】</strong>地址。</li> <li class="li"><strong class="ph b">【本地域名服务器】</strong>向<strong class="ph b">【</strong><strong class="ph b">权威</strong><strong class="ph b">域名服务器】</strong>查询www.example.com的IP。</li> <li class="li"><strong class="ph b">【</strong><strong class="ph b">权威</strong><strong class="ph b">域名服务器】返回</strong>www.example.com<strong class="ph b">的IP</strong>。</li> <li class="li">【<strong class="ph b">本地域名服务器</strong>】向客户端返回www.example.com的IP。</li> </ol> </section>