RE: [nukkad] telnet v/s RAS

["Net Geek" <>]

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Dear Krishna Rao

>Whats the use of doing so much, if we can access another m/c via >Telnet, 
>then whats the use of RAS?

Telnet and RAS are fundamentally different. Telnet is a TCP/IP protocol used 
for accessing a computer host wheras RAS is a means of accessing a network 
remotely. For the sake of simplicity Telnet is  a software utility used to 
log into computers whereas RAS is part of network infrastructure. Any host 
that is part of a network can log into another host in the network provided 
that the operating system supports Telnet. But if you want to access a 
network host remotely (say you want to get access to your company server 
from home), then you dial into a Remote Access Server (RAS) which can be 
either PC based (for example Win NT/2K RAS) or a dedicated box (Cisco RAS, 
Bay Networks RAS etc). The RAS authenticates you against your user-id and 
grants you permissions to the network resources accordingly. The connection 
you get via RAS is the same as the one you get while physically connected to 
the network except for reduced bandwidth or speed. So in short RAS provides 
you a network path and Telnet prodies you a means to reach a particular 
network host.


>Is Telnet, only on n/ws or can be used via a phone line.

You can use Telnet to log into any network host using a RAS connection.


>What rights does a m/c that is connecting thru
>telnet, has on the m/c to which it connects.
>I mean can it acecss every directory and file as and
>how it wishes.

Telnet only provides a means to reach a host or to make it simple you are 
provided with a login prompt. In order to log into the host you need to have 
a valid user-id and password, which is provided by the systems 
administrator. Which directories, files and other resources like printers 
can be accessed depend on the user rights assigned to your user-id by the 
systems administrator.  For example if I need to log into a host there 
should be a user account “netgeek” (fictitious name) in the host with 
password (optional).


>Is telent used only for Unix/Linux or can be used for windows OS also.

Telnet is present by default as part of the TCP/IP protocol stack in 
Unix/Linux systems. However in theory any OS with TCP/IP protocol support 
can have Telnet service. Coming to Windows OS, there is a Telnet server 
shipped along with the Win2000 Professional OS. However it is not enabled by 
default and need to be added as an additional component from the Win2K 
Resource Kit CD. But all you get is a DOS prompt shell, which is not of much 
use in practice. There are other commercial Telnet Server packages for Win 
NT. I’m not aware of any freeware product.


Hope you find this useful. Do let me know in case you need more info.



Bye


Netgeek
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