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                            ## 計算機網絡體系結構
![](https://img.kancloud.cn/41/d3/41d3b1c825d47b7376909b4839727250_702x428.png)
####   
各層作用

*   應用層：應用層協議定義的是應用進程間通信和交互的規則
*   運輸層：運輸層的任務就是負責向`兩臺主機中進程之間的通信`提供`通用的數據傳輸`服務
*   網絡層：把運輸層產生的報文段或用戶數據報封裝成`分組`或`包`進行傳送
*   數據鏈路層：將網絡層交下來的 IP 數據報組裝成幀，并在兩個相鄰結點間的鏈路上傳送
*   物理層：利用物理媒體以`比特`形式傳送數據

拓展閱讀[《計算機網絡體系結構》](https://gitee.com/shanghai-leisurely-network_0/PHP-Interview-QA/blob/master/docs/01.%E7%BD%91%E7%BB%9C/01.%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BD%91%E7%BB%9C%E4%BD%93%E7%B3%BB%E7%BB%93%E6%9E%84.md)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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