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ISDN,Integrated Services Digital Network


ISDN, which stands for Integrated Services Digital Network, is a system of digital phone connections which has been available for over a decade. This system allows voice and data to be transmitted simultaneously across the world using end-to-end digital connectivity. It is a circuit switched connection. ISDN

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FTP Server Configuration on Linux

FTP:The Basics:

FTP is the Internet standard File Transfer Protocol that is used to send and receive files over the Internet . It runs over TCP and uses two separate ports for control and data connections between the client and server applications . Control port uses Port 21 which is used for sending control information such as username , password, put/get commands, etc while data files are usually transferred on port 20.

Modes of Running FTP:

FTP runs in two modes : Active and Passive

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