Introduction to telnet:
Telnet is the protocol used to establish a login session on a remote computer on the network. While many computers on the Internet require users to have authorization, others are open to the public and can be logged onto with telnet. Telnet is not a method to transfer files from one machine to another, but rather is a way to remotely connect to another system with priveleges to run specific programs on that system. Some uses of the Telnet protocol include:
connecting to a library catalog to search that library's collection connecting to a location that allows public priveleges to search its campus information system connecting to a location that gives you an up-to-the minute weather report
Basic Telnet Commands
open - establishes a connection to the specified host.close - closes an open connection and leaves you in the telnet software quit - closes any open telnet sessions and exits the telnet software. When using a telnet program like NCSA Telnet, you invoke these commands by way of pull-down menus or command keys.
Introduction to FTP, File Transfer Protocol:
Basic commands in FTP:
To do FTP, a user invokes one of two commands:
get the command for transferring a file from another server to your own computer.
put the command for moving a file from your computer to another one.
Who can do FTP? Anonymous vs. authorized priveleges
On many servers, called anonymous FTP servers, anyone can do FTP. All that is required to login is a username (anonymous) and a password (your e-mail address). To get an idea of the many resources available via FTP, you can look at this selected list of FTP servers.
Other servers require you to be a registered "authorized" user before you're permitted to do FTP. In such a case, you would need to contact the system operator for the server you wish to access, and request an authorization and a password. Getting an authorization and password might mean that you can get and put only to specific subdirectories on that server.
Resources available to you via FTP
Freeware
When you download freeware, the author continues to carry the copyright to the software, but permits you to use the program for free. You can share freeware with others, as long as you don't sell it.
Public Domain
When you download public domain software, you can use it freely. The creator carries no copyright, and has released it for anyone to use. There are no limits on distribution or sale--and anyone can modify the program.
Shareware :
When you download shareware, the author continues to carry the copyright to the software, but you're permitted short-term use of the program for evaluation purposes.
At the end of evaluation period, you must either pay the copyright holder for the program or destroy all copies you've made of it.
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