How to Know and all the wireless hacking trick (Part 1): Wi-Fi defenition and Specification

Wi-Fi (Wireless Fidelity)

Wi-Fi (Wireless Fidelity) is a wireless connection such as mobile phones using radiotechnology so that users can transfer data quickly. Wi-Fi not only allows you to access the Internet, Wi-Fi can also be used to create wireless networks in the enterprise.Because of that many people associate with Wi-Fi "Freedom" for Wi-Fi technologygives freedom to the wearer to access the Internet or transferring data from themeeting room, hotel rooms, campuses, and cafes are marked "Wi-Fi Hot Spot."

Wi-Fi was originally intended for the use of wireless devices and Local Area Network(LAN), but now more widely used to access the Internet. This allows anyone with a computer with a wireless card (wireless card) or personal digital assistants (PDAs) toconnect to the internet using access point (otherwise known as hotspots) nearby.

specification: 
Wi-Fi was designed based on the IEEE 802.11 specification. Today there are fourvariations of 802.11, namely: 802.11a, 802.11b, 802.11g, and 802.11n. B is the first product specifications Wi-Fi. Variation gdan n is one product that has the most salesin 2005.

specification Wi-Fi
specification	Speed	band frequncy	suitable with
802.11b	11 Mb/s	2.4 GHz	B
802.11a	54 Mb/s	5 GHz	A
802.11g	54 Mb/s	2.4 GHz	b, g
802.11n	100 Mb/s	2.4 GHz	b, g, n