RAS (Remote Administration Service)
RAS is the NT service that allows dial-up network connections between a RAS server and a dial-up client. RAS is very complex I don't know many administrators including myself who understand this completely. I recommend that you study very well for this area of the NT tests.
RAS can be implemented on NT Servers and NT Workstations, with the main difference between the two is that Server can support 256 simultaneous connections while Workstation can only support one. Different types of operating systems can be configured as dial-up networking clients and connect to a RAS server, including: MSDOS, Windows 3.1x, Windows 9x, and Windows NT.
Dial-up clients can use several different methods to connect to a RAS Server, including:
Connection Protocols Supported by RAS
Transport Protocols Supported by RAS
DLC Protocol is not supported by RAS
RAS Name Resolution - The same methods employed by other network function are used to resolve netbios names while using RAS.
RAS is a network service and is installed using the network applet in Control Panel. After you start the installation and all the files are copied you must set up the modems or other connection devices to use RAS. A wizard steps you through the process so I suggest you give it a try yourself.
Remote Access Admin
Remote Access Admin is the administration tool you use to manage the RAS Server. You can use it to assign dial in permission and configure call back security for users. You can also use it to view connections to ports or to disconnect users from the service. Remote Access Admin is automatically installed when you install RAS.
RAS can be set up to accept several different security settings
Require Data Encryption- Check this box if you want to encrypt all data sent between the computers.
Use Current Username and Password - If you select this then RAS will not prompt for the user to log into the RAS machine but will use the current user name and password.
RAS is a broad subject and I will be adding more to this page as I get time. A good book I found is Windows Remote Access Toolkit. This is a excellent book to read if you're interested in learning more about this fascinating subject.