What is WI-Fi?
Wi-Fi is a generic term that refers to the IEEE 802.11 communications standard for Wireless Local Area Networks (WLANs).
Wi-Fi Network connect computers to each other, to the internet and to the wired network.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).
Initially, Wi-Fi was used in place of only the 2.4GHz 802.11b standard, however the Wi-Fi Alliance has expanded the generic use of the Wi-Fi term to include any type of network or WLAN product based on any of the 802.11 standards, including 802.11b, 802.11a, dual-band, and so on.
Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed:
IEEE 802.11b
IEEE 802.11a
IEEE 802.11g
Wi-Fi enable a user to get access to internet anywhere in the given location. Now you can make a network in Hotels, Libraries, colleges, universities, campus, private institutes, and coffee shops and even on a public place to make your business more profitable and connect with their client any time. WiFi makes waves for business with their highly effective cable less media.
ELEMENTS OF A WI-FI:
Access Point (AP):
The AP is a wireless LAN transceiver or “base station” that can connect one or many wireless devices simultaneously to the Internet.
Wi-Fi cards
They accept the wireless signal and relay information.They can be internal and external.(e.g PCMCIA Card for Laptop and PCI Card for Desktop PC)
Safeguards
Firewalls and anti-virus software protect networks from uninvited users and keep information secure.
How Wi-Fi works?
Wi-Fi works with no physical wired connection between sender and receiver by using radio frequency (RF) technology, a frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space. The cornerstone of any wireless network is an access point (AP). The primary job of an access point is to broadcast a wireless signal that computers can detect and “tune” into. In order to connect to an access point and join a wireless network, computers and devices must be equipped with wireless network adapters.
In brief:
1. A computer’s wireless adapter translates data into a radio signal and transmits it using an antenna.
2. A wireless router receives the signal and decodes it.
The router sends the information to the internet using a physical, wired Ethernet connection.
FEATURES OF Wi-Fi:
WiFi providing secure wireless solutions and it supports the growth of a prototype mobile ad hoc wireless network.
Flexibility:
WiFi technology has several advantages it support an entire present day gadgets and create a connection between components on the same network and have ability to transfer data between the different kind of devices such as game, MP3 player, PDA’s and much more!
Convenient and easy Availability
WiFi is a convenient technology and where the range station exists you are online during travel you can equip with a Wi-Fi network and set up shop anyplace. You will automatically connect with internet if you are near hotspot.
Faster and Secure
With WiFi you can get high speed of internet because it is very fast than DSL and Cable connection you can establish a Wifi network in small space now you don’t need any professional installation just connect to a power outlet with an Ethernet cord, and start browsing.
WiFi security system for threats makes it more renewable and its tool protect your VPN and secure web page.
Wi-Fi NETWORK TOPOLOGIES:
1)AP-based topology (Infrastructure Mode)
2)Peer-to-peer topology (Ad-hoc Mode)
3)Point-to-multipoint bridge topology
DISADVANTAGES
Some of the threats in Wi-fi technology are:
1)Eavesdropping
2)Man-in-the-middle attacks
3)Denial of Service
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