| Port xxxx <--- Port 21 | | ACK | | Port xxxx ---> Port 21 | | | | (控制操作: 用戶列目錄或傳輸文件) | | | | Port, IP, Port yyyy | | Port xxxx <--- Port 21 | | Port Seccussful | | Port xxxx <--- Port 21 | | List, Retr or Stor | | Port xxxx ---> Port...
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