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第三期:网络基础 #3

Description

@jedmeng

孟之杰
2016年7月28日(周四)

网络基础

提前预习

自行搜集资料了解以下内容:

  • ISO/OSI七层网络模型
  • 子网掩码的计算
  • 交换机与集线器的区别

教学大纲

  1. IP地址及子网划分
    • ip地址及子网掩码
    • ip地址分类
    • DHCP协议
    • ARP协议
  2. 网络设备
    • 集线器
    • 交换机
    • 路由器
  3. DNS
    • 域名解析流程

演讲目标

通过教学,让大家了解网络相关基础知识

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all
       blocks
      (function() {
      function addCopyButtons() {
      document.querySelectorAll('pre code').forEach(function(codeBlock) {
      if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
      codeBlock.parentElement.setAttribute('data-copy-added', 'true');
      var btn = document.createElement('button');
      btn.textContent = 'Copy';
      btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
      btn.onmouseover = function() { this.style.opacity = '1'; };
      btn.onmouseout = function() { this.style.opacity = '0.7'; };
      btn.onclick = function() {
      navigator.clipboard.writeText(codeBlock.textContent).then(function() {
      btn.textContent = 'Copied!';
      setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
      });
      };
      codeBlock.parentElement.style.position = 'relative';
      codeBlock.parentElement.appendChild(btn);
      });
      }
      addCopyButtons();
      // Re-run on dynamic content
      var observer = new MutationObserver(addCopyButtons);
      observer.observe(document.body, { childList: true, subtree: true });
      })();
      }
      } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
      })();
      (function(){
      try {
      var __m = "github.com";
      var __re = new RegExp('^' + "github\\.com" + '
      第三期:网络基础 · Issue #3 · haotech/Learning · GitHub
      Skip to content

      第三期:网络基础 #3

      Description

      @jedmeng

      孟之杰
      2016年7月28日(周四)

      网络基础

      提前预习

      自行搜集资料了解以下内容:

      • ISO/OSI七层网络模型
      • 子网掩码的计算
      • 交换机与集线器的区别

      教学大纲

      1. IP地址及子网划分
        • ip地址及子网掩码
        • ip地址分类
        • DHCP协议
        • ARP协议
      2. 网络设备
        • 集线器
        • 交换机
        • 路由器
      3. DNS
        • 域名解析流程

      演讲目标

      通过教学,让大家了解网络相关基础知识

      Metadata

      Metadata

      Assignees

      No one assigned

        Labels

        Type

        No type

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        No projects

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          No branches or pull requests

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          , 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' 第三期:网络基础 · Issue #3 · haotech/Learning · GitHub
          Skip to content

          第三期:网络基础 #3

          Description

          @jedmeng

          孟之杰
          2016年7月28日(周四)

          网络基础

          提前预习

          自行搜集资料了解以下内容:

          • ISO/OSI七层网络模型
          • 子网掩码的计算
          • 交换机与集线器的区别

          教学大纲

          1. IP地址及子网划分
            • ip地址及子网掩码
            • ip地址分类
            • DHCP协议
            • ARP协议
          2. 网络设备
            • 集线器
            • 交换机
            • 路由器
          3. DNS
            • 域名解析流程

          演讲目标

          通过教学,让大家了解网络相关基础知识

          Metadata

          Metadata

          Assignees

          No one assigned

            Labels

            Type

            No type

            Projects

            No projects

              Milestone

              No milestone

              Relationships

              None yet

              Development

              No branches or pull requests

              Issue actions

              , 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' 第三期:网络基础 · Issue #3 · haotech/Learning · GitHub
              Skip to content

              第三期:网络基础 #3

              Description

              @jedmeng

              孟之杰
              2016年7月28日(周四)

              网络基础

              提前预习

              自行搜集资料了解以下内容:

              • ISO/OSI七层网络模型
              • 子网掩码的计算
              • 交换机与集线器的区别

              教学大纲

              1. IP地址及子网划分
                • ip地址及子网掩码
                • ip地址分类
                • DHCP协议
                • ARP协议
              2. 网络设备
                • 集线器
                • 交换机
                • 路由器
              3. DNS
                • 域名解析流程

              演讲目标

              通过教学,让大家了解网络相关基础知识

              Metadata

              Metadata

              Assignees

              No one assigned

                Labels

                Type

                No type

                Projects

                No projects

                  Milestone

                  No milestone

                  Relationships

                  None yet

                  Development

                  No branches or pull requests

                  Issue actions

                  , 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' 第三期:网络基础 · Issue #3 · haotech/Learning · GitHub
                  Skip to content

                  第三期:网络基础 #3

                  Description

                  @jedmeng

                  孟之杰
                  2016年7月28日(周四)

                  网络基础

                  提前预习

                  自行搜集资料了解以下内容:

                  • ISO/OSI七层网络模型
                  • 子网掩码的计算
                  • 交换机与集线器的区别

                  教学大纲

                  1. IP地址及子网划分
                    • ip地址及子网掩码
                    • ip地址分类
                    • DHCP协议
                    • ARP协议
                  2. 网络设备
                    • 集线器
                    • 交换机
                    • 路由器
                  3. DNS
                    • 域名解析流程

                  演讲目标

                  通过教学,让大家了解网络相关基础知识

                  Metadata

                  Metadata

                  Assignees

                  No one assigned

                    Labels

                    Type

                    No type

                    Projects

                    No projects

                      Milestone

                      No milestone

                      Relationships

                      None yet

                      Development

                      No branches or pull requests

                      Issue actions

                      , 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' 第三期:网络基础 · Issue #3 · haotech/Learning · GitHub
                      Skip to content

                      第三期:网络基础 #3

                      Description

                      @jedmeng

                      孟之杰
                      2016年7月28日(周四)

                      网络基础

                      提前预习

                      自行搜集资料了解以下内容:

                      • ISO/OSI七层网络模型
                      • 子网掩码的计算
                      • 交换机与集线器的区别

                      教学大纲

                      1. IP地址及子网划分
                        • ip地址及子网掩码
                        • ip地址分类
                        • DHCP协议
                        • ARP协议
                      2. 网络设备
                        • 集线器
                        • 交换机
                        • 路由器
                      3. DNS
                        • 域名解析流程

                      演讲目标

                      通过教学,让大家了解网络相关基础知识

                      Metadata

                      Metadata

                      Assignees

                      No one assigned

                        Labels

                        Type

                        No type

                        Projects

                        No projects

                          Milestone

                          No milestone

                          Relationships

                          None yet

                          Development

                          No branches or pull requests

                          Issue actions

                          , 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' 第三期:网络基础 · Issue #3 · haotech/Learning · GitHub
                          Skip to content

                          第三期:网络基础 #3

                          Description

                          @jedmeng

                          孟之杰
                          2016年7月28日(周四)

                          网络基础

                          提前预习

                          自行搜集资料了解以下内容:

                          • ISO/OSI七层网络模型
                          • 子网掩码的计算
                          • 交换机与集线器的区别

                          教学大纲

                          1. IP地址及子网划分
                            • ip地址及子网掩码
                            • ip地址分类
                            • DHCP协议
                            • ARP协议
                          2. 网络设备
                            • 集线器
                            • 交换机
                            • 路由器
                          3. DNS
                            • 域名解析流程

                          演讲目标

                          通过教学,让大家了解网络相关基础知识

                          Metadata

                          Metadata

                          Assignees

                          No one assigned

                            Labels

                            Type

                            No type

                            Projects

                            No projects

                              Milestone

                              No milestone

                              Relationships

                              None yet

                              Development

                              No branches or pull requests

                              Issue actions

                              , 'i'); if (__m === '*' || __re.test(location.href)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); 第三期:网络基础 · Issue #3 · haotech/Learning · GitHub
                              Skip to content

                              第三期:网络基础 #3

                              Description

                              @jedmeng

                              孟之杰
                              2016年7月28日(周四)

                              网络基础

                              提前预习

                              自行搜集资料了解以下内容:

                              • ISO/OSI七层网络模型
                              • 子网掩码的计算
                              • 交换机与集线器的区别

                              教学大纲

                              1. IP地址及子网划分
                                • ip地址及子网掩码
                                • ip地址分类
                                • DHCP协议
                                • ARP协议
                              2. 网络设备
                                • 集线器
                                • 交换机
                                • 路由器
                              3. DNS
                                • 域名解析流程

                              演讲目标

                              通过教学,让大家了解网络相关基础知识

                              Metadata

                              Metadata

                              Assignees

                              No one assigned

                                Labels

                                Type

                                No type

                                Projects

                                No projects

                                  Milestone

                                  No milestone

                                  Relationships

                                  None yet

                                  Development

                                  No branches or pull requests

                                  Issue actions