COSC 432 Shi Li 12/8/2008

File Transfer Protocol (FTP) Used to transfer files and data between computers via internet Defined as RFC959 Developed in 1971 Last updated in July 1973

Server/Client model FTP often works with Transmission Control Protocol (TCP) Telnet Protocol Allows to transfer large files

Transfer Ability FTP allows file sharing between remote machines Allow file transferring between computers that have different operating System Availability Available for almost all operating systems Can be used in command prompt by using FTP commands Can be used in the web browser FTP applications

Independency Allow between client and server machine system files Efficiency  Enable efficient data transfer Security It provide the a environment to transfer files indirectly and implicitly between users Accessing by user name and password makes it reliable and safe to use FTP anywhere Some FTP server allows people to use anonymous as a default user name

FTP has to be on both server and client computers to work Connection Control connection (port 21) Used to send and receive FTP commands Data connection (port 20) Used to upload and download files Processes Data Transfer Process Establishing the connection and managing the data channel Protocol Interpreter Interprets the protocol let DTP be controlled using commands received over the control channel

Transferring mode between server and client Active mode Control connection port: Client: Large port (N>1023); Server: 21 Data connection port: Client: N+1; Server: 20 Passive mode Control connection port: Client: Large port (N>1023); Server: 21 Data connection port: Client: N+1; Server: large port (P>1023) File Transferring mode ASCII mode.txt,.html,.asp,.vbs,.js Binary.doc,.pdf,.mp3/mp4

Desktop Environment Use “ftp” command to implement FTP FTP server Used to keep files that are available users Websites Easy to update Internet Very efficient to get a specific file through the internet Everywhere

Allows multiple File transfer Failed file download tolerance Resume the file when failed to download in the middle of process User can choose whether to use ASCII or Binary mode as needed Be able to get file from FTP server on any computer that has access to internet by using his own username and password Easy to manage files by using FTP applications and to set the read/write privilege

Cute FTP FileZilla Leech FTP Windows FTP FTP Explorer

Grant, Chris. FTP Reviewed, Parikka, Thomas, J. FTP Transfer Modes: ASCII vs. Binary. Mar. 18, asphttp:// 18.asp Postel, J, Reynolds, J. File Transfer Protocol. Oct Webdevelopersnotes.com Basics of File Transfer Protocol. fer_protocol.php3 fer_protocol.php3 Wells, Terri. A Brief Introduction to FTP. Aug. 30, Brief-Introduction-to-FTP/ Brief-Introduction-to-FTP/

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