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