文件传输协议（FTP:File Transfer Protocol）使得主机间可以共享文件。 FTP 使用 TCP 生成一个虚拟连接用于控制信息，然后再生成一个单独的 TCP 连接用于数据传输。控制连接使用类似 TELNET 协议在主机间交换命令和消息。文件传输协议是TCP/IP网络上两台计算机传送文件的协议，FTP是在TCP/IP网络和INTERNET上最早使用的协议之一，它属于网络协议组的应用层。FTP客户机可以给服务器发出命令来下载文件，上传文件-File Transfer Protocol (FTP: File Transfer Protocol) so you can share files between hosts. FTP uses TCP to generate a virtual connection for control information, and then generate a separate TCP connection for data transfer. TELNET protocol control connection using a similar exchange between the host commands and messages. File Transfer Protocol is a TCP/IP network protocol two computers to transfer files, FTP is a TCP/IP network and INTERNET protocol used on the first one, it belongs to the group of application layer network protocols. FTP clients can issue commands to the server to download files, upload files