Sabtu, 13 Ogos 2011

computer network and communications

INTRODUCTION TO COMPUTER NETWORKS AND COMMUNICATIONS

COMPUTER NETWORK

A computer network is a system of interconnected computers and peripheral devices. For example, it may connect computers, printers, scanners and cameras. Using hardware and software, these interconnected computing devices can communicate with each other through defined rules of data communications. In a network, computers can exchange and share information and resources.
A computer network may operate on wired connections or wireless connections. When two or more networks are linked or connected and are able to communicate with one another using suitable hardware and software, it is called an internetwork.

COMMUNICATIONS

Communications is about the transfer of information from a sender, across a distance, to a receiver. Using electricity, radio waves or light, information and data in the form of codes are transmitted through a physical medium such as wire, cable, or even the atmosphere.
Therefore, in order to make communications possible from computers, across telephones and radios and back to computers and other digital devices again, there must be a signal translator, which we call – a modem. The modem, which is short for modulator or demodulator, converts digital signals into analog and back again into digital signals for information to move across the telephone line.

Jumaat, 5 Ogos 2011

ramadhan...

Bulan Ramadhan merupakan penghulu segala bulan.Ramadhan juga adalah bulan yg penuh keberkatan dan utk semua umt islam melakukuan amal ibadat sbyk yg mungkin.Malam lailatulqadar adalah malam yg dinanti nantikan oleh semua umt islam yg beribadat pd 1/3 akhir malam.Pd malam turunnya lailatulqadar, doa umt islam yg beribadat dgn penuh khusyu,insaf dan tekun akn dimakbulkan oleh Allah S.W.T,tetapi kita tidak dapat mengetahui pd mlm bilakah ianya akn turun.Oleh itu,marilah kita beramai-ramai melakukan amal kebaikan di bulan yg mulia ini.Insyaallah dosa kita akn diampunkan oleh Allah,dan hidup diberkati.