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Send a Life. It's Free!

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Submitted By rezanator
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Common Port Number and Description | Port # | Name | Description | 20 | FTP | Data. File Transfer Protocol is a protocol used on the Internet for sending files. | 21 | FTP | Control | 22 | SSH | Remote Login Protocol. Developed by SSH Communications Security Ltd. Secure Shell is a program to log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another. It provides strong authentication and secure communications over insecure channels. It is a replacement for rlogin, rsh, rcp, and rdist. SSH protects a network from attacks such as IP spoofing, IP source routing, and DNS spoofing. An attacker who has managed to take over a network can only force ssh to disconnect. He or she cannot play back the traffic or hijack the connection when encryption is enabled. When using ssh's slogin (instead of rlogin) the entire login session, including transmission of password, is encrypted; therefore it is almost impossible for an outsider to collect passwords. SSH is available for Windows, Unix, Macintosh, and OS/2, and it also works with RSA authentication. | 23 | Telnet | A terminal emulation program for TCP/IP networks such as the Internet. The Telnet program runs on your computer and connects your PC to a server on the network. You can then enter commands through the Telnet program and they will be executed as if you were entering them directly on the server console. This enables you to control the server and communicate with other servers on the network. To start a Telnet session, you must log in to a server by entering a valid username and password. Telnet is a common way to remotely control Web servers. | 25 | Simple Mail Transfer Protocol (SMTP) | Short for Simple Mail Transfer Protocol, a protocol for sending email messages between servers. Most email systems that send mail over

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