Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

The whole site in one document for easy reference!
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
                9  TCP/IP General File Transfer Protocols (FTP and TFTP)
                     9  File Transfer Protocol (FTP)

Previous Topic/Section
FTP Overview, History and Standards
Previous Page
Pages in Current Topic/Section
1
Next Page
FTP Operational Model, Protocol Components and Key Terminology
Next Topic/Section

FTP Concepts and General Operation

The developers of the File Transfer Protocol (FTP) had to balance the need for a rich set of functionality with the desire for a protocol that was as simple and easy to implement as possible. FTP is therefore not nearly as simple as its “little brother”, the Trivial File Transfer Protocol (TFTP), but given what the protocol can do, it's much less complicated than one might expect. The operation of the protocol can in fact be broken down into a number of rather straight-forward elements that work together to establish connections and pass commands and data.

In this section I describe the most important concepts behind the File Transfer Protocol and explain its operation in general terms. I begin with a discussion of the FTP communication and operational model, which shows the internal components of the protocol and how they communicate over the internetwork. I describe the process by which FTP control connections are established, and how user authentication is performed. I explain the two main methods of creating data connections (normal and passive) and discuss the issues that pertain to when each is used. I then describe how FTP communication works in general and the various transmission modes. I conclude with a discussion of the different options for data representation used for files sent with FTP.

Related Information: In this section I will make limited mention of commands used to communicate between an FTP client and server. The details of FTP commands can be found in a separate section.


Quick navigation to subsections and regular topics in this section



Previous Topic/Section
FTP Overview, History and Standards
Previous Page
Pages in Current Topic/Section
1
Next Page
FTP Operational Model, Protocol Components and Key Terminology
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.