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.
|
|
|
|
FTP Operational Model, Protocol Components and Key Terminology
(Page 3 of 4)
Server-FTP Process Components
The Server-FTP Process contains these
two protocol elements:
- Server Protocol Interpreter (Server-PI):
The protocol interpreter responsible for managing the control connection
on the server. It listens on the main reserved FTP port for incoming
connection requests from users (clients). Once a connection is established,
it receives commands from the User-PI, sends back replies, and manages
the server data transfer process.
- Server Data Transfer Process (Server-DTP):
The DTP on the server side, used to send or receive data to or from
the User-DTP. The Server-DTP may either establish a data connection
or listen for a data connection coming from the user. It interacts with
the server's local file system to read and write files.
User-FTP Process Components
The User-FTP Process contains these
three protocol elements:
- User Protocol Interpreter (User-PI): The
protocol interpreter responsible for managing the control connection
on the client. It initiates the FTP session by issuing a request to
the Server-PI. Once a connection is established, it processes commands
received from the user interface, sends them to the Server-PI, and receives
back replies. It also manages the user data transfer process.
- User Data Transfer Process (User-DTP):
The DTP on the user side, which sends or receives data to or from the
Server-DTP. The User-DTP may either establish a data connection or listen
for a data connection coming from the server. It interacts with the
client device's local file system.
- User Interface: The user interface provides
a more friendly FTP interface to a human user. It allows
simpler user-oriented commands to be used for FTP functions rather than
the somewhat cryptic internal FTP commands, and also allows results
and information to be conveyed back to the person operating the FTP
session.
Key Concept: The Server-FTP Process and User-FTP Process both contain a Protocol Interpreter (PI) element and a Data Transfer Process (DTP) element. The Server-PI and User-PI are logically linked by the FTP control connection; the Server-DTP and User-DTP by data connections. The User-FTP Process includes a third component, the User Interface, which provides the means for the human user to issue commands and see responses from the FTP software. |
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! |
|
|
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.
|