FTP

1. FTP

2. Introduction • FTP works on the client/server principle. A client program enables the user to interact with a server in order to access information and services on the server computer. • Files that can be transferred are stored on computers called FTP servers. To access these files, an FTP client program is used. This is an interface that allows the user to locate the file(s) to be transferred and initiate the transfer process.

3. Introduction • FTP uses the services of TCP. It needs two TCP connections. The well-known port 21 is used for the control connection and the well-known port 20 for the data connection.

4. FTP Working

5. Active and Passive Connection Mode • In an Active FTP connection, the client opens a port and listens and the server actively connects to it. • In a Passive FTP connection, the server opens a port and listens (passively) and the client connects to it.

6. FTP Softwares • Cute FTP • Filezilla (Free)

7. Telnet Remote Login

8. Telnet • TELNET is a general-purpose client-server application program. • TELNET enables the establishment of a connection to a remote system in such a way that the local terminal appears to be a terminal at the remote system.

9. Telnet Working