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Wi-Fi
Wi-Fi® is a WLAN (Wireless Local Area Network) technology. It primarily provides short-range, high-speed data connections between mobile data devices (such as laptops) and nearby Wi-Fi access points (special hardware connected to a wired network).
Wi-Fi is a trademark of the Wi-Fi Alliance, a nonprofit industry association. The IEEE technical specification for Wi-Fi is 802.11.
There are several variants of 802.11. The most common is 802.11b, which provides speeds up to 11 mbs. 802.11g and 802.a are faster versions. Many 802.11g and 802.11a products are backward-compatible with the original 802.11b.
Range for Wi-Fi is typically around 100 to 300 feet indoors and 2000 feet outdoors.
Most Wi-Fi operates in the 2.4 GHz unlicensed frequency band. This is the same band as Bluetooth and some cordless phones, although the technologies are designed to co-exist and not interfere. 802.11a operates in the 5 GHz unlicensed frequency band.
Wi-Fi networks can be set up and operated by anyone, with different networks allowing different kinds of access. A public "hot spot" at an airport or coffee shop might charge an hourly rate for access. A hotel might offer free wi-fi to guests. A company or university might offer on-premises free access for verified employees/students. Or a home user could set up their own network to which only they had access.
While most Wi-Fi connections are between a mobile device and an access point, it is also possible to create an "ad-hoc" network directly among two or more devices, without an access point.
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Wi-Fi
Wi-Fi (short for "wireless fidelity") is a term for certain types of wireless local area network (WLAN) that use specifications in the 802.11 family. The term Wi-Fi was created by an organization called the Wi-Fi Alliance, which oversees tests that certify product interoperability. A product that passes the alliance tests is given the label "Wi-Fi certified" (a registered trademark).
Originally, Wi-Fi certification was applicable only to products using the 802.11b standard. Today, Wi-Fi can apply to products that use any 802.11 standard. The 802.11 specifications are part of an evolving set of wireless network standards known as the 802.11 family. The particular specification under which a Wi-Fi network operates is called the "flavor" of the network. Wi-Fi has gained acceptance in many businesses, agencies, schools, and homes as an alternative to a wired LAN. Many airports, hotels, and fast-food facilities offer public access to Wi-Fi networks. These locations are known as hot spots. Many charge a daily or hourly rate for access, but some are free. An interconnected area of hot spots and network access points is known as a hot zone.
Unless adequately protected, a Wi-Fi network can be susceptible to access by unauthorized users who use the access as a free Internet connection. The activity of locating and exploiting security-exposed wireless LANs is called war driving. An identifying iconography, called war chalking, has evolved. Any entity that has a wireless LAN should use security safeguards such as the Wired Equivalent Privacy (WEP) encryption standard, the more recent Wi-Fi Protected Access (WPA), Internet Protocol Security (IPsec), or a virtual private network (VPN).
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how Wi-Fi work اتمنى تكون مفيدة
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