[4.1 網絡互聯模型與常見網絡協議](4.1%E7%BD%91%E7%BB%9C%E4%BA%92%E8%81%94%E6%A8%A1%E5%9E%8B%E4%B8%8E%E5%B8%B8%E8%A7%81%E7%BD%91%E7%BB%9C%E5%8D%8F%E8%AE%AE.md) [4.2 IP地址及其表示方法](4.2IP%E5%9C%B0%E5%9D%80%E5%8F%8A%E5%85%B6%E8%A1%A8%E7%A4%BA%E6%96%B9%E6%B3%95.md) [4.3 子網與子網掩碼](4.3%E5%AD%90%E7%BD%91%E4%B8%8E%E5%AD%90%E7%BD%91%E6%8E%A9%E7%A0%81.md) [4.4 IPV4數據報/IPV6](4.4IPV4%E6%95%B0%E6%8D%AE%E6%8A%A5-IPV6.md) [4.5 TCP與UDP](4.5TCP%E4%B8%8EUDP.md) [4.6 網絡設計與綜合布線系統](4.6%E7%BD%91%E7%BB%9C%E8%AE%BE%E8%AE%A1%E4%B8%8E%E7%BB%BC%E5%90%88%E5%B8%83%E7%BA%BF%E7%B3%BB%E7%BB%9F.md) [4.7 地址與域名](4.7%E5%9C%B0%E5%9D%80%E4%B8%8E%E5%9F%9F%E5%90%8D.md)