wifi seminars report

[seminar class]

SUBMIITED BY
YASHPREET SINGH

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WI-FI TECHNOLOGY
INTRODUCTION
Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode.Wi-Fi (Wireless Fidelity) 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.
Wifi is a brand originally licensed by the Wi-Fi Alliance to describe the underlying technology of wireless local area networks (WLAN) based on the IEEE 802.11 specifications.
Wi-Fi was intended to be used for mobile computing devices, such as laptops, in LANs, but is now often used for increasingly more applications, including Internet and VoIP phone access, gaming, and basic connectivity of consumer electronics such as televisions and DVD players. There are even more standards in development that will allow Wi-Fi to be used by cars in highways in support of an Intelligent Transportation System to increase safety, gather statistics, and enable mobile commerce IEEE 802.11p.
THE WI-FI TECHNOLOGY
Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed:
IEEE 802.11b
• Appear in late 1999
• Operates at 2.4GHz radio spectrum
• 11 Mbps (theoretical speed) - within 30 m Range
• 4-6 Mbps (actual speed)
• 100 -150 feet range
• Most popular, Least Expensive
• Interference from mobile phones and Bluetooth devices which can reduce the transmission speed.
IEEE 802.11a
• Introduced in 2001
• Operates at 5 GHz (less popular)
• 54 Mbps (theoretical speed)
• 15-20 Mbps (Actual speed)
• 50-75 feet range
• More expensive
• Not compatible with 802.11b
IEEE 802.11g
• Introduced in 2003
• Combine the feature of both standards (a,b)
• 100-150 feet range
• 54 Mbps Speed
• 2.4 GHz radio frequencies
• Compatible with ‘b’
Elements of a WI-FI Network
• 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 a Wi-Fi Network Works
Basic concept is same as Walkie talkies.A Wi-Fi hotspot is created by installing an access point to an internet connection.An access point acts as a base station. When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly.A single access point can support up to 30 users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors.Many access points can be connected to each other via Ethernet cables to create a single large network.
Wi-Fi Applications
• Home
• Small Businesses or SOHO
• Large Corporations & Campuses
• Health Care
• Wireless ISP (WISP)
• Travellers
Wi-Fi Security Techniques
• Service Set Identifier (SSID)
• Wired Equivalent Privacy (WEP)
• 802.1X Access Control
• Wireless Protected Access (WPA)
• IEEE 802.11i
Advantages of wi-fi technology
• Mobility
• Ease of Installation
• Flexibility
• Cost
• Reliability
• Security
• Use unlicensed part of the radio spectrum
• Roaming
• Speed
Limitations
• Interference
• Degradation in performance
• High power consumption
• Limited range