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Network Commands

In Chapters 24 and 25, you learn about networking your computer with other computers and making connections to the Internet. Although most people are familiar with using a network browser to search for interesting content on the Internet, you should be aware of a few commands that have been around for a long time. Diagnostic commands, such as ping and tracert are discussed in Chapter 23, “Disaster Recovery.” However, several applications are available at the command line that you may find useful. Use the /? switch to obtain further help for these commands:

  • Telnet—This is standard remote terminal application developed early in the development of the transfer call protocol/Internet protocol suite (TCP/IP). As with the rest of the commands listed here, Telnet requires a server and a client program. You can use the syntax telnet servername or telnet ipaddress to establish a remote character-cell (that is, Command Prompt–like interface) into a remote system that runs a Telnet server service. For example, a Windows XP client could use telnet to make a connection to a Windows 2000 or Windows 2002 server to execute commands, if allowed by the server. Telnet is an important tool for administrators who remotely manage systems. However, when used on a wide area network like the Internet, your username and password are sent as clear text! Use a dial-up connection to your server or a virtual private network (VPN) connection instead.

  • FTP— File Transfer Protocol (FTP) is a very useful utility. Again, Windows XP includes client software, and servers include the server side of this equation. You can post files to another computer using this command to list the directories (provided you have permission to do so), as well as to upload or download files.


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