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Communications Fundamentals Presentation ON Wi-Fi Technology:

Submitted By:- Raushan Kr. Chaurasiya (68) Santu Thapa (75) Satyanarayan Prajapat (76) Communications Fundamentals Presentation ON Wi-Fi Technology


Introduction Wi-Fi Technologies Wi-Fi Network Elements How a Wi-Fi Network Works Wi-Fi Network Topologies Wi-Fi Configurations Applications of Wi-Fi Wi Fi Security Advantages/ Disadvantages of Wi-Fi 3G vs. Wi Fi Conclusion Contents


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 . Introduction

The Wi-Fi Technology:

Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed: IEEE 802.11b IEEE 802.11a IEEE 802.11g The Wi-Fi Technology

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 802.11b

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 802.11a

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’ IEEE 802.11g

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. Elements of a WI-FI Network

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. How a Wi-Fi Network Works

Wi-Fi Network Topologies:

AP-based topology (Infrastructure Mode) Peer-to-peer topology (Ad-hoc Mode) Point-to-multipoint bridge topology Wi-Fi Network Topologies

AP-based topology:

The client communicate through Access Point. BSA-RF coverage provided by an AP. ESA-It consists of 2 or more BSA. ESA cell includes 10-15% overlap to allow roaming. AP-based topology

Peer-to-peer topology:

AP is not required. Client devices within a cell can communicate directly with each other. It is useful for setting up of a wireless network quickly and easily. Peer-to-peer topology

Point-to-multipoint bridge topology:

This is used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart.These conditions receive a clear line of sight between buildings. The line-of-sight range varies based on the type of wireless bridge and antenna used as well as the environmental conditions. Point-to-multipoint bridge topology

Wi-Fi Configurations:

Wi-Fi Configurations

Wi-Fi Configurations:

Wi-Fi Configurations

Wi-Fi Configurations:

Wi-Fi Configurations

Wi-Fi Applications:

Home Small Businesses or SOHO Large Corporations & Campuses Health Care Wireless ISP (WISP) Travellers Wi-Fi Applications

PowerPoint Presentation:

WEP (Wired equivalent privacy):- The original encryption technique specified by the IEEE 802.11 Standard. WPA (Wi Fi Protected Access):-A new standard that provides improved encryption security over WEP. WPA2 :- is an improved version of WPA that uses Advanced Encryption Standard (AES) technology. Basic Wi-Fi Security Techniques

PowerPoint Presentation:

Basic Wi-Fi Security Techniques(Contd.)

Advantages of Wi-Fi:

Mobility Ease of Installation Flexibility Cost Reliability Security Use unlicensed part of the radio spectrum Roaming Speed Advantages of Wi-Fi

Disadvantages of Wi-Fi:

Interference Degradation in performance High power consumption Limited range Disadvantages of Wi-Fi

3G vs. WI-FI:

3G vs. WI-FI


Conclusion Wi Fi is a simple ,cost-effective way to connect to the internet,without the need of physically connecting wires. In 1997 IEEE draftedthe 802.11 standard for wireless local area networking. Hotspot is a geographical areasetup in any public location. and has a readily accessible wireless network. Security is a huge challenge for Wi Fi networks,many security techniques are used to improve it. Wi Fi networks has a several limitations that should be concerned.


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