Transcript Wi-Fi TECHNOLOGY

Wi-Fi TECHNOLOGY
SUBMITTED BY
DINEEJ A
28
S3 EC
CONTENTS
INTRODUCTION
WIFI TECHNOLOGY
HOW A WIFI NETWORK WORKS
WIFI NETWORK TOPOLOGIES
WIFI CONFIGURATIONS
WIFI APPLICATIONS
WIFI SECURITY
ADVANTAGES AND DISADVANTAGES
INTRODUCTION
Wi-Fi Stands For “WIRELESS FIDELITY”.
Wi-Fi Is An Alternative To Wired Technology, Used To
Connecting Devices In Wireless Mode.
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/ Mobiles To Each Other, To
The Internet And To The Wired Network.
Wi-Fi Works On Physical And Data Link Layer.
WIFI TECHNOLOGY
Wi-Fi networks use radio technology to transmit and receive data
at high speed
•IEEE 802.11b
•IEEE 802.11a
•IEEE 802.11g
IEEE 802.11a
•2.4 GHz
•11Mbps theoretical speed
•100-150 feet range
•Most popular, least expensive
•Interference from mobiles and Bluetooth devices can reduce
transmission speed
IEEE 802.11a
•5 GHz
•54 Mbps
•50-75 feet range
•More expensive
•Not compatible with 802.11b
IEEE 802.11g
•2.4 GHz
•54 Mbps
•100-150 feet range
•Combine the feature of both a&b
•Compatible with IEEE802.11b
IEEE 802.11(a vs. b vs. g
802.11b
802.11a
802.11g
•Lowest price
•Supports more user per room
•Best value- only 10%
•Excellent signal range
•Unaffected by interference
premium for 5 times the
•Coverage penetrates
from 2.4 GHz DEVICES
speed of b
most walls
•Can co-exist with b and g
•Compatible with b networks
•Works withn public
networks
•Excellent signal range
hotspots
•Coverage limited to 1 room
•Coverage penetrates most
wall
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 device
simultaneously to the internet
Wi-Fi cards-They accept the wireless signal and relay
information. They can be internal or external
SAFE GUARDS-Firewalls and antivirus software protect
network from uninvited user and keep information secure
TOPOLOGIES
1- AP Based topology
•The client communicate through AP
•BSA-RF coverage provided by an AP
•ESA-It consists of 2 or more BSA
•ESA cells includes 10-15% overlap to allow roaming
2- 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
HOW A Wi-Fi NETWORK WORKS
•A Wi-Fi hotspot is created by installing an access point to an
internet connection
•An AP act as abase station
•When Wi-Fi enabled device encounters a hotspot, the device can
then connect to the network wirelessly
•A single AP can support up to 30 users and can functions within a
range of 100-150 feet indoors and 300 feet outdoors
•Many AP can be connect together via Ethernet cable to obtain a
single large network
Wi-Fi SECURITY
•SERVICE SET IDENTIFIER(SSID)
•WIRED EQUIVALENT PRIVACY(WEP)
•WIRELESS PROTECTED ACCESS(WPA)
•WEP and WPA are encryption protocols that you can
choose from in your router firmware
•Wi-Fi protected access ,a subset of the up coming
802.11i security standard will replace the flawed wired
equivalent privacy
•without your SSID, people will not be able to join your
Wi-Fi hotspot
ADVANTAGES
Mobility
Ease of installation
Flexibility
Cost
Reliability
Security
Use unlicensed part of radio spectrum
Roaming
speed
LIMITATIONS
Interference
Degradation in performance
High power consumption
Limited range
CONCLUSION
•Wi-Fi is a simple and cost effective way to connect to internet
without the need of wires
•It is going in popularity because of decreasing cost and the
freedom it gives to user
DINEEJ. A
28
S3 EC