WI-FI 18

Wi-Fi (/ unsupported input] waɪfaɪ /, also written Wifi or WiFi) is a technology that u
tilizes electronic devices to exchange data wirelessly (using radio waves) through a computer network, including high-speed Internet connections. 
The Wi-Fi Alliance defines Wi-Fi as "any wireless local area network (WLAN) product based on the 802.11 Institute of Electrical and Electronics Engineers (IEEE) standards." [1] However, since most WLANs today are based on those standards ,The term "Wi-Fi" is used in common English as a synonym of "WLAN".A device that can use Wi-Fi (such as a personal computer, video game console, smart phone,tablet, or digital audio player) can connect to a network source such as the Internet via a wireless network access point. Such access points (or hotspots) have a range of about 20 meters (65 feet) in the room and more widely outdoors. Hotspot coverage may include an area of ​​room with walls blocking radio waves or several square miles - this can be done by using multiple overlapping access points.

"Wi-Fi" is a trademark of the Wi-Fi Alliance and the brand name for products that use the IEEE 802.11 standard family. Only Wi-Fi products that complete Wi-Fi Alliance certification testing trials may use the name and trademark "Wi-Fi CERTIFIED".Wi-Fi has a fickle security history. His first encryption system, WEP, proved to be easily penetrated. Higher quality protocols, WPA and WPA2, are then added. However, an optional feature added in 2007 called Wi-Fi Protected Setup (WPS), has a gap that allows attackers to obtain WPA or WPA2 router password remotely within a few hours. [2] Some companies advise to turn off the WPS feature. The Wi-Fi Alliance has since updated its test plan and certification program to ensure all newly certified
equipment is immune from severe PIN AP attacks.

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