Wi-Fi

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Definition

Wi-Fi, also spelled Wifi or WiFi, is a term for certain types of wireless local area network (WLAN) technology that uses 2.4 GHz UHF and 5 GHz SHF radio waves to provide wireless high-speed Internet and network connections. Wi-Fi is a trademarked name but not an acronyms. Many devices, such as computers, smartphones, digital cameras etc. can connect to the Internet or communicate with one another wirelessly within a particular area where there is a Wi-Fi access point. The Wi-Fi Alliance, the organization that owns the Wi-Fi registered trademark term specifically defines Wi-Fi as any “wireless local area network (WLAN) products that are based on the Institute of Electrical and Electronics Engineers’ (IEEE) 802.11 standards”. Only Wi-Fi products that complete Wi-Fi Alliance interoperability certification testing successfully may use the “Wi-Fi CERTIFIED” trademark. As a popular WLAN technology, Wi-Fi is widely used in businesses, campus, and homes as well as many airports, hotels, and fast-food restaurants.

Advantages & Disadvantages

Advantages:

  • Convenience – Users can access network resources from nearly any convenient location within their home, office or any other places.

  • Mobility – People can access the internet even outside their normal work environment as most chain coffee shops, restaurants or public places offerring theircustomers a wireless connection to the internet at little or no cost.

  • Lower Cost – Wi-Fi allows cheaper deployment of local area networks (LANs). The price of chipsets for Wi-Fi continues to drop, making it an economicalnetworking option included in even more devices.

  • Expandability – Wi-Fi can serve a suddenly-increased number of clients with the existing equipment. In a wired network, additional clients would require additionalwiring.

Disadvantages

  • Security – The security of Wi-Fi is a main problem which people more concern. Though there is an encryption key to keep the Wi-fi safe, it has still been utilized bysome unwanted users.

  • Range – The Wi-Fi range is limited. To obtain additional range, repeaters or additional access points will have to be purchased. Costs for these items can add upquickly.

  • Interference – Wi-Fi signals are subject to a wide variety of interference, as well as complex propagation effects that are beyond the control of the networkadministrator.

  • Speed – Comparied to the wired networks, the speed of Wi-Fi (typically 1-54 Mbps) is far slower than the slowest common wired networks (100Mbps up to severalGbps).

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