Installing server roles on Windows Server 2008 R2 Server Core

To install a server role on a Server Core installation of Windows Server 2008 R2, you should use DISM.exe to install and uninstall most server roles.

1. At Server core server, log in as Administrator.
2. At "Command Prompt", enter "Dism /online /get-features /format:table".

This command is used to  listing all server roles and features which are installed.

3. Enter "Dism /online /enable-feature /featurename:TelnetClient" to install telnet client.

The telnet client was installed in the server.

4. Enter " Dism /online /disable-feature /featurename:TelnetClient" to install telnet client.

The telnet client was uninstalled in the server.

Reference:

http://technet.microsoft.com/en-us/library/ee441260(WS.10).aspx

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