Wi-Fi Technology1

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Presentation Transcript

Wi-Fi Technology : 

Wi-Fi Technology By G Sathish Reddy & N Upendranath

Agenda : 

Agenda What is Wi-Fi Wi-Fi standards Elements How it works Security Advantages and Limitations

What is Wi-Fi ? : 

What is Wi-Fi ? Wi-Fi is an abbreviation for wireless-fidelity known as 802.11 wireless network. Wi-Fi Wireless Technology that uses radio frequency to transmit data through the air. 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.

Wi-Fi standards : 

Wi-Fi standards IEEE 802.11b( 1999) IEEE 802.11a(2001) IEEE 802.11g(2003)

Wi-Fi (802.11b) : 

Wi-Fi (802.11b) It operates in 2.4 GHz frequency range. Limits to the number of Access points in range of each other, and three . It having 1 to 11 Mbps speed ,but realistically about 4-5 Mbps. It uses direct sequence spread spectrum technology. It is having the range of 100-300 feet indoor and 400 -1500 feet outdoor .

Wi-Fi (802.11a) : 

Wi-Fi (802.11a) This is operates in 5GHz frequency. Multiple channels can be configured faster throughput and more Access points can be allocated. It is having 6-54Mbps speed realistically about 27Mbps. It uses the frequency division multiplexing technology. It is having the range of 40-300feet indoor and 100-1000feet out door.

Wi-Fi (802.11g) : 

Wi-Fi (802.11g) It is extension of 802.11b,and shorter range than 802.11b. Flexible because multiple channels can be combined for faster throughput, but limited to one access point. Runs at 54Mbps ,realistically about 20-25Mbps. It uses the frequency division multiplexing technology.

Elements : 

Elements Access points : It is a wireless LAN transceiver or base station that are connect one or many wireless devices simultaneously to the internet. Wi-Fi cards : they accept the wireless signals and relay information .they can be internal and external. (ex; PCI,PCMCIA) Safe guards :firewalls and antivirus software protect networks from invited users and keep information secure.

How a Wi-Fi Network Works : 

How a Wi-Fi Network Works 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.

Security : 

Security Wireless technology doesn’t remove any old security issues, but introduces new ones Eavesdropping Man-in-the-middle attacks Denial of Service

Eavesdropping : 

Eavesdropping By default, everything is transmitted in clear text Usernames, passwords, content ... No security offered by the transmission medium Different tools available on the internet Network sniffers, protocol analysers . . . Password collectors

MITM Attack : 

MITM Attack Attacker spoofes a disassociate message from the victim The victim starts to look for a new access point, and the attacker advertises his own AP on a different channel, using the real AP’s MAC address The attacker connects to the real AP using victim’s MAC address

Denial of Service : 

Denial of Service Attack on transmission frequecy used Frequency jamming Not very technical, but works Attack on MAC layer Spoofed deauthentication / disassociation messages can target one specific user Attacks on higher layer protocol (TCP/IP protocol) SYN Flooding

Advantages : 

Advantages Mobility. Flexibility. Reliability. Speed.

Limitations : 

Limitations Interference. Hi power consumption . Limited range.

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