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Wi-FI Technology

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Information about Wi-FI Technology
Education

Published on April 22, 2012

Author: arorajitin93

Source: authorstream.com

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Wi-Fi Technology: Wi-Fi Technology Agenda: Agenda Introduction Wi-Fi Technologies Wi-Fi Architecture 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 Introduction: 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. The Wi-Fi Technology: 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 IEEE 802.11b : 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: 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 PowerPoint Presentation: Access point Adapters Components of Wi-Fi PowerPoint Presentation: Wi-Fi Antenna Wi-Fi Bridge PowerPoint Presentation: PCI cards that accept wireless PC cards External USB wireless NICs How a Wi-Fi Network Works : 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 Network Topologies: Wi-Fi Network Topologies AP-based topology (Infrastructure Mode) Peer-to-peer topology (Ad-hoc Mode) Point-to-multipoint bridge topology AP-based topology: 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. Peer-to-peer 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. Point-to-multipoint bridge 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. Wi-Fi Configurations: Wi-Fi Configurations Wi-Fi Configurations: Wi-Fi Configurations Wi-Fi Applications: Wi-Fi Applications Home Small Businesses Large Corporations & Campuses Health Care Wireless ISP (WISP) Travellers Wi-Fi Security Threats: Wi-Fi Security Threats Wireless technology doesn’t remove any old security issues, but introduces new ones Man-in-the-middle attacks Denial of Service 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 Wi-Fi Security : Wi-Fi Security The requirements for Wi-Fi network security can be broken down into two primary components: Authentication User Authentication Server Authentication Privacy Authentication: Authentication Keeping unauthorized users off the network User Authentication Authentication Server is used Username and password Risk: Data (username & password) send before secure channel established Solution Establishing a encrypted channel before sending username and password Advantages: Advantages Mobility Ease of Installation Flexibility Cost Reliability Security Use unlicensed part of the radio spectrum Roaming Speed Limitations: Limitations Interference Degradation in performance High power consumption Limited range PowerPoint Presentation: THANK YOU

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