3. Linux is a Unix-like computer operating
system assembled under the model of free
and open source software development
and distribution.

5. Linux Protocols

6. Telnet
 Terminal emulation Network.
 It’s used to remote login to a telnet server.
 It’s based on CUI
 Package name : telnet-server
 Port Number : 23

7. FTP (File Transfer Protocol )
 FTP is used for transforming file between different
machines , also S/W different Platform.
 Port Number : 20, 21
 Package Name : vsftp (very secure file transfer
protocol ).
 Daemon Name : vsftp

8. Security
Access Control
SELinux
Firewall
PAM
TCP Wrapper

9. Linux v/s Windows

10. Conclusion