Common Data Network Services

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Common Data Network Services:


File Transfer Protocol (FTP): File Transfer Protocol (FTP) is a TCP-based application with many options and features such as modifying directories, implementing wildcard characters in listed files, transmitting multiple files at once, and utilizing a variety of character sets or file formats. It can be set up for anonymous access without the use of a password, or it can be configured to require a username and password. It also offers an interface resembling a UNIX file directory.

When an FTP client tries to hook up to an FTP server, a TCP connection is directed to the FTP server’s well-known port 21. A username and password is requested from the FTP client, which the server uses for verification of the files available to that user. This security corresponds to the file security on the server’s platform. All the commands used to administer the transferring of files are sent across this connection. This gives the user a range of commands to activate settings for transfer and other actions. The file is sent over a separate FTP data connection over TCP port 20. This prohibits a file transfer from making modifications to the control session.

Secure File Transfer Protocol (SFTP): SFTP (Secure File Transfer Protocol) is a secure version of the File Transfer Protocol (FTP) that includes enhanced encryption and authentication. It administers secure file transfer using SSH or SSH-2. Like FTP, SFTP can be used to transfer files between a client and a server over a network. The same functionality applies to remote servers. An SFTP can be used exclusively for file transfer access, or it can provide system command access as well. SFTP can limit users to their home directories, is not susceptible to the “flashfxp” transfer utility, and is much less vulnerable to exploitation than FTP. It can be programmed to authorize users with certificates and passwords.

Secure Shell (SSH) and Secure Shell version 2 (SSH-2):

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