Cisco IOS，最早稱為互聯網作業系統（英語：Internetwork Operating System，簡稱IOS）是思科公司（Cisco System）為其網絡裝置開發的操作維護系統。用戶可以透過命令列介面對網絡裝置進行功能設置，提供的功能大致為以下幾點：
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