1. Short-cuts
1- Lan  Local area net work
2- iSDn  Intergrated Services Digital Network
3- FTP  File Transfer Protocol
4- Ram  randem access memory
5- Rom  red only memory
6- ISp  internet service provider
7- Wan Wide Area Network
8- C.p.u  Center Processing Unit
9- http Hypertext transfer protpcol
10-PSTN Public switched telephone network