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Infrastructure wireless network is the method where all wireless devices communicate using a central device, the access point such as a router. In ad-hoc networking, devices communicate directly with each other without the use of an access point. Wireless network set up at home is in infrastructure mode.
2.4 GHz and 5.8 GHz or 5 GHz are the most common wireless frequency band used in sync with IEEE 802.11 Wi-Fi standards. Wireless systems use radio frequencies which works in between 20 kHz and 200 GHz. Hertz (Hz) is the unit of frequency in the International System of Units (SI).
Some of the commonly used wireless standards include 802.11a, 802.11b, 802.11g, 802.11n, and 802.11ac, where each standard was released to improve on the existing ones. 802.11b was an extension of the base standard 802.11 which was released in 1999. 802.11ac is the latest generation of IEEE standards.
802.11ac is an IEEE standard which was finalized at the end of 2013 but was formally approved on January 7, 2014. 802.11ac operated on 5 GHz frequency band. Its high frequency allows the radio waves to carry more data. There is no interference with 2.4 GHz frequency band used by household devices.
Wireless N Networking refers to computers networks that follow specifications in IEEE 802.11n standard. Development of 802.11n began in 2002 & was published in 2009. Alternate names such as "Wireless N" and "Draft N" were coined to distinguish early products whose development started before 2009.
Sometimes 802.11g is referred as "G". It is an IEEE wireless standard. 802.11g was an improvement on 802.11a and 802.11b and was released in June 2002. 802.11g supports WLAN (Wireless LAN) communication between host computers, routers, and other consumer devices.