What is FTP

FTP (File Transfer Protocol) is a protocol used to transfer files in a client/server model. The most common use for it is to transfer a made webpage into a server for a website. FTP is an old protocol that predates TCP/IP. It runs on TCP ports 20 and 21. 21 is the port that handles the connection status and 20 is the port used to transfer data.

Of course while those ports are the standard, only one person can use them at a time on each server. therefore, the client and server agree to use an ephemeral port. An ephemeral port is a temporary port that they agree on. In active mode the client picks the port and leaves them exposed to the internet. In passive mode, the server picks the port. Passive mode is slightly more secure for the client and works better behind firewalls.

In this video, I show of the built-in FTP functionality of Google Chrome, Mozilla’s Firefox, and Microsoft’s Internet Explorer. I also use Windows 7’s built in command line program, ftp.exe. FTP.exe only uses active connections.

Various websites
FileZilla
http://filezilla-project.org/
Firefox
http://www.mozilla.com/
Chrome
http://www.google.com/chrome/
Windows 7
http://www.microsoft.com/windows/windows-7/

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