barcode addin excel 2013 Figure 9-21 freeSSHd in Software

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Figure 9-21 freeSSHd
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NOTE Some versions of Windows Server came with a rather poor Telnet server that only allowed a maximum of two client connections
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A Telnet client is the computer from which you log onto the remote server Most operating systems have a built-in Telnet client that you run from a command prompt Figure 9-22 shows the Telnet client built into Ubuntu Linux Just open a terminal window and type telnet and the IP address of the Telnet server
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Figure 9-22
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Command-prompt Telnet clients lack a number of handy features They can t, for example, remember the IP addresses, user names, or passwords for Telnet servers, so every time you use Telnet, you have to enter all that information again Third-party Telnet clients, such as the very popular PuTTY you saw in 8, store all this information and much more (Figure 9-23)
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Figure 9-23
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Configuring a Telnet Client
When you configure a Telnet client, you must provide the host name, your user login name, and the password As I mentioned previously, you must have permission to access the server to use Telnet A host name is the name or IP address of the computer to which you want to connect For instance, you might connect to a Web server with the host name websrvmhtechedcom The user login name you give Telnet should be the same login name you d use if you logged into the server at its location Some computers, usually university libraries with online catalogs, have open systems that enable you to log in with Telnet These sites will either display a banner before the login prompt that tells you what login name to use, or they ll require no login name at all As with the login name, you use the same password for a Telnet login that you d use to log into the server directly It s that simple Computers with open access will either tell you what password to use when they tell you what login name to use, or they ll require no login name/password at all EXAM TIP Telnet enables you to control a remote computer from a local computer over a network
Rlogin, RSH, and RCP
The CompTIA Network+ exam tests you on rlogin, RSH, and RCP These are three oldschool programs in the UNIX world The R stands for remote and, like Telnet and SSH, these programs provide remote access and control of servers Also like Telnet, they do not encrypt data and thus, should not be used across the Internet Here is a quick breakdown of the suite:
Rlogin Remote login works very similarly to Telnet You simply run the program with the host name of the server and you can connect and run commands just like with Telnet It has one very nice advantage over Telnet in that it can be configured to log in automatically without the need to enter a user name and password Rlogin works over TCP port 513 RSH Remote Shell allows you to send single commands to the remote server Whereas rlogin is designed to be used interactively, RSH can be easily integrated into a script RSH runs over TCP port 514 by default RCP Remote Copy provides the capability to copy files to and from the remote server without the need to resort to FTP or NFS (Network File System, the UNIX form of folder sharing) RCP can also be used in scripts and shares TCP port 514 with RSH
SSH and the Death of Telnet
Telnet has seen long and heavy use in the TCP world from the earliest days of the Internet, but it suffers from lack of any security Telnet passwords as well as data are transmitted in clear text and are thus easily hacked To that end, SSH has now replaced
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