In the initial stage, certain security weaknesses were there in FTP and for addressing them, drafting of RFC 2228 took place. Since all connections are started by client, this mode is also termed as firewall friendly. The server then sends port number and IP address used by client for initiating data connection and begins sending using privileged port. When server receives PASV command from client then a passive connection is established. A connection is then established by the server from port 20 to clie nt and then begins data transferring. PORT N is the FTP command sent to the server so that it comes to know about it. The notes of incoming data are taken by client in active mode on port N from server.
In any of these cases, a connection is established by the client over TCP using a random port to FTP server port 21. The FTP session could be initiated in either passive or active mode and is used for getting details about establishment of connection. FTP is older than standard network protocol TCP/IP po wering the internet and it preceded HTTP as well.
While HTTP still takes care of several transfers, the common behind the scene transfer still make use of FTP like website builders, banking etc. Keys are not needed by FTP servers that are anonymous and in general, these are used for freely distributed open source software. With the help of FTP, it is also possible to remove directories, create them and list the files but authentication is required for the same using a password and username.
The fine tuned FTP serves best for large files. File download is also allowed by the browsers via FTP in which files of any kind could be exchanged that inclu des videos, music and documents. A simple DOS like command line interface could be used for working with the FTP. The files asked by client are provided to them by server. This protocol is client-server one used for exchanging files over internet between computers.
Related Web Hosting, VPS Blog / Web Hosting Business News: What is FTP?įile Transfer Protocol or FTP is the rule system used by networked computers for communicating with each other.
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