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                            #### 應用層
應用層協議有很多，比如HTTP、FTP、郵件協議，開發者開發的軟件一般都是應用層協議軟件

常見應用層協議：
* telnet協議是一種遠程登錄協議，它使我們能在本地完成遠程任務，本書后續章節將會多次使用telnet客戶端登錄到其他服務上
* OSPF（Open Shortest Path First，開放最短路徑優先）協議是一種動態路由更新協議，用于路由器之間的通信，以告知對方各自的路由信息
* DNS（Domain Name Service，域名服務）協議提供機器域名到IP地址的轉換
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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