IT is often understood as application of computing machines in certain networks, some of which provide communication protocols by using routers and other network devices in order to ensure that millions of computers can exchange, store, transmit, and receive data. That is, millions of people can make a skype meeting, shop, communicate, find virtual friends whenever they connect the network. In addition, by one of the recent improvements in IT, called as cloud technology, we can store and share any type of data such as photos, which may need a large space in sense of Giga bytes instead of using physical storage disks. These opportunities have facilitated and simplified our life.