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                # 1.4 DNS ## 1.4 DNS 瀏覽器要找到名為“www.example.com”的主機必須通過**DNS(Domain Name System,即域名系統)**[1](#fn_1),把“www.example.com”這樣的名字轉化為一個**IP地址**[2](#fn_2)——在計算機網絡的世界里,我們通常依賴IP地址定位到一臺具體的計算機。 > 1. 參考這里了解更多關于DNS:[https://en.wikipedia.org/wiki/Domain\_Name\_System](https://en.wikipedia.org/wiki/Domain_Name_System)[?](#reffn_1 "Jump back to footnote [1] in the text.") > 2. 借助nslookup或dig命令你可以觀察由主機名稱查找其IP的過程和結果,例如:`nslookup www.example.com`[?](#reffn_2 "Jump back to footnote [2] in the text.")
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