Difference between revisions of "Primary TCP/IP Port Assignments and Descriptions"

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<td>'''20'''</td><td>'''FTP'''<td>'''File Transfer Protocol (Data)''' - The File Transfer protocol provides a mechanism for transferring specific files between network connected computer systems. Transfer is typically performed using the ''ftp'' client which provides a range of commands used to connect to a remote server for the purpose of uploading or downloading files. Most modern web browsers also have the ability to browse and download files located on a remote FTP server. FTP uses TCP (rather than UDP) to transfer files so is considered to be a highly reliable tranport mechanism.</td>
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<td>'''20'''</td><td>'''FTP'''<td>'''File Transfer Protocol (Data)''' - The File Transfer protocol provides a mechanism for transferring specific files between network connected computer systems (usually a Linux or UNIX based system). Transfer is typically performed using the ''ftp'' client which provides a range of commands used to connect to a remote server for the purpose of uploading or downloading files. Most modern web browsers also have the ability to browse and download files located on a remote FTP server. FTP uses TCP (rather than UDP) to transfer files so is considered to be a highly reliable tranport mechanism.</td>
 
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Revision as of 17:58, 30 March 2007

TCP/IP provides a total of 65,535 ports of which 1023 are considered to be well known ports. In reality the number of ports that are used by popular network clients and services comprises an even smaller subset of the well known group of ports. The following table lists the functions of this subset.

PortAssigmentDescription
20FTPFile Transfer Protocol (Data) - The File Transfer protocol provides a mechanism for transferring specific files between network connected computer systems (usually a Linux or UNIX based system). Transfer is typically performed using the ftp client which provides a range of commands used to connect to a remote server for the purpose of uploading or downloading files. Most modern web browsers also have the ability to browse and download files located on a remote FTP server. FTP uses TCP (rather than UDP) to transfer files so is considered to be a highly reliable tranport mechanism.
21FTP File Transfer (Control) - Traditionally FTP has two ports assigned (port 20 and port 21). Port 20 was originally conisidered the data transfer port, while port 21 was assigned to communicate control information. In modern implementations port 20 is now rarely used, with all communication taking place on port 21.
22SSHSecure Shell - The Secure Shell is used to provide a secure, encypted, Telnet session over TCP/IP. This essentially provides a mechanism to log into a remote system. The original mechanism for remotely terminal access was the Telent protocol. Because Telnet transmits everything in plain text its use is now strongly discouraged in favor of the secure shell, which encrypts all communications, including log-in and password credentials. SSH also provides the mechanism by which files can be security tranfered using the scp client. SSH also now replaces both the rsh and rlogin clients.
23Telnet
25SMTP - Simple mail Transfer Protocol
53DNS - Domain Name Server
69TFTP - Trivial File Transfer (UDP based)
80HTTP - Hypertext Text Transfer Protocol
110POP3 - Post Office Protocol
119NNTP - Network News Transfer Protocol
123NTP - Network Time Protocol
143IMAP4 - Internet Message Access Protocol, Version 4
161SNMP - Simple Network Management Protocol
443HTTPS - Hypertext Transfer Protocol Secure
2049NFS - Network File System