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                            [TOC]


## TCP標記
占6位,每位各有不同意義
|  標記   |   含義  |
| --- | --- |
|   URG  | Urgent:緊急位,URG=1,表示緊急數據    |
|    **ACK**   |   **Acknowledgement:確認位,ACK=1,確認號才生效**  |
|   PSH    |    Push:推送位,PSH=1,盡快地把數據交付給應用層   |
|   RST    |   Rest:重置位,RST=1,重新建立連接    |
|   **SYN**    |  **Synchronization:同步位,SYN=1表示連接請求報文**     |
|    **FIN**   |   **Finish:終止位,FN=1表示釋放連接**    |

<br/>


![](https://img.kancloud.cn/ed/82/ed828b73baa5f409f49ec01546b99310_2146x1048.png)

:-: 圖例

## 為什么發送方要發出第三個確認報文呢?
已經**失效的連接請求報文**傳送到對方,**引起錯誤**

![](https://img.kancloud.cn/8f/c1/8fc12f07b4952c60d7581683fe51fbfc_1898x874.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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