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<!DOCTYPE html><html lang="zh-CN" data-theme="light"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"><title>洁莹不吃鱼 - 欢迎来到不吃鱼的博客！</title><meta name="author" content="洁莹不吃鱼"><meta name="copyright" content="洁莹不吃鱼"><meta name="format-detection" content="telephone=no"><meta name="theme-color" content="#ffffff"><meta name="description" content="记录一方天地罢了">
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class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="site-info"><h1 id="site-title">洁莹不吃鱼</h1><div id="site-subtitle"><span id="subtitle"></span></div><div id="site_social_icons"><a class="social-icon" href="https://github.com/6jybuchiyu" target="_blank" title="GitHub"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:[email protected]" target="_blank" title="Email"><i class="fas fa-envelope"></i></a><a class="social-icon" href="https://y.qq.com/n/ryqq/profile/like/song?uin=oi6koiSq7ecsov**" target="_blank" title="QQMusic"><i class="fa-solid fa-music"></i></a><a class="social-icon" href="https://space.bilibili.com/39143065" target="_blank" title="bilibili"><i class="fa-solid fa-tv"></i></a></div></div><div id="scroll-down"><i class="fas fa-angle-down scroll-down-effects"></i></div></header><main class="layout" id="content-inner"><div class="recent-posts" id="recent-posts"><div class="recent-post-item"><div class="post_cover left"><a href="/2024/01/13/ViT%E5%AE%9E%E7%8E%B0/" title="ViT实现"><img class="post_bg" src="/./img/blogset/10.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="ViT实现"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/01/13/ViT%E5%AE%9E%E7%8E%B0/" title="ViT实现">ViT实现</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2024-01-13T03:24:46.000Z" title="发表于 2024-01-13 11:24:46">2024-01-13</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2024-01-14T08:23:13.887Z" title="更新于 2024-01-14 16:23:13">2024-01-14</time></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E7%A7%91%E7%A0%94/">科研</a></span></div><div class="content">备一份怕忘记</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2024/01/13/%E8%AE%A1%E7%BD%91%E7%AC%AC%E4%B8%89%E7%AB%A0/" title="计网第三章"><img class="post_bg" src="/./img/blogset/9.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="计网第三章"></a></div><div class="recent-post-info"><a class="article-title" href="/2024/01/13/%E8%AE%A1%E7%BD%91%E7%AC%AC%E4%B8%89%E7%AB%A0/" title="计网第三章">计网第三章</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2024-01-13T02:49:02.000Z" title="发表于 2024-01-13 10:49:02">2024-01-13</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2024-01-13T03:04:16.889Z" title="更新于 2024-01-13 11:04:16">2024-01-13</time></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E6%9C%AC%E7%A7%91%E8%AF%BE%E5%86%85/">本科课内</a></span></div><div class="content">数据链路层数据链路层使用的信道主要有：
点对点信道，使用PPP协议
广播信道，使用CSMA/CD协议
数据链路层研究的是在同一个局域网中，分组怎样从一台主机传送到另一台主机而不经过路由器转发。局域网属于数据链路层的范围。
数据链路层只管点到点运输，不同种类网络的数据链路层采用不同的数据链路层协议。
3.1 数据链路层的几个共同问题3.1.1 数据链路和帧链路是一条无源的无源的点到点的物理线路段，中间没有任何其他的交换节点。一条链路只是一条通路的一个组成部分。数据链路除了物理线路外，还必须有通信协议来控制这些数据的传输。若把实现这些协议的硬件和软件加到链路上，就构成了数据链路。即数据链路和链路的区别是数据链路还有协议
数据链路层把网络层交下来的IP数据报构成帧发送到链路上并且把收到的帧中的数据取出并上交给网络层。——封装成帧
3.1.2 三个基本问题数据链路层的主要功能
链路管理
帧定界
流量控制
差错控制
将数据和控制信息区分开
透明传输
寻址
其中任何数据链路层都要解决的三个问题：
封装成帧
透明传输
差错控制
封装成帧
封装成帧就是在一段数据的前后分别添加首 ...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2023/01/18/MicroExpression/" title="一点点CV知识"><img class="post_bg" src="/./img/blogset/7.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="一点点CV知识"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/01/18/MicroExpression/" title="一点点CV知识">一点点CV知识</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-01-18T07:27:06.000Z" title="发表于 2023-01-18 15:27:06">2023-01-18</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2024-01-13T03:06:28.733Z" title="更新于 2024-01-13 11:06:28">2024-01-13</time></span><span class="article-meta tags"><span class="article-meta-separator">|</span><i class="fas fa-tag"></i><a class="article-meta__tags" href="/tags/%E7%A7%91%E7%A0%94/">科研</a></span></div><div class="content">细致操作</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2023/01/18/%E5%AF%B9CV%E7%9A%84%E4%B8%80%E4%BA%9B%E7%90%86%E8%A7%A3%E4%BB%A5%E5%8F%8A%E4%BB%8B%E7%BB%8D/" title="对CV的一些初步理解"><img class="post_bg" src="/./img/blogset/1.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="对CV的一些初步理解"></a></div><div class="recent-post-info"><a class="article-title" href="/2023/01/18/%E5%AF%B9CV%E7%9A%84%E4%B8%80%E4%BA%9B%E7%90%86%E8%A7%A3%E4%BB%A5%E5%8F%8A%E4%BB%8B%E7%BB%8D/" title="对CV的一些初步理解">对CV的一些初步理解</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-01-18T07:27:06.000Z" title="发表于 2023-01-18 15:27:06">2023-01-18</time><span class="article-meta-separator">|</span><i class="fas fa-history"></i><span 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