Client Server Listen port 21 FTP client program

情況一 Client Server Listen port 21 (等) FTP client program 呢個 IP , port

情況一 Client Server FTP client program 有咩 files ? FTP server program 有 x,

情況二 Client Server 冇 software listen FTP client program 呢個 IP , port ,

情況三 Client FTP client program Router 呢個 IP , port , 有冇人 ? Server

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情況一 Client Server Listen port 21 (等) FTP client program 呢個 IP , port , 有冇人 ? 有我係 “XXX”, password “YYY” OK , 成功登入下頁續 Port 21 FTP server program

情況一 Client Server FTP client program 有咩 files ? FTP server program 有 x, y, z …. . 咁多 files and folder 我想要 abc. zip (假設已存在) Send file 再見一個簡單 0既 “交易” 完成 , 實際運作會複雜好多

情況二 Client Server 冇 software listen FTP client program 呢個 IP , port , 有冇人 ? 等 ……. . 沒有回應 , Close connection 原因好多 Eg. Firewall, ISP blocked, Router….

情況三 Client FTP client program Router 呢個 IP , port , 有冇人 ? Server FTP server program listen port 21 一般 0黎講, 由於 Router 個 port 21 冇 software listen, Client 係會 Timeout (冇回應) 所以要入 Router setting, 設定成 : “當收到 port 21 0既 data, Forward 去 “XXX” (某部機)”