Wi-Fi is a wireless technology standard that allows electronic devices to connect to the internet or communicate with each other wirelessly. It uses radio waves to provide wireless network connections between devices like computers, phones, and more. The Wi-Fi Alliance promotes standards to improve compatibility between wireless products using IEEE 802.11 standards. Wi-Fi networks use access points, wireless cards, and security measures like authentication and encryption to create secure wireless connections.
Wi-Fi (Wireless Fidelity) is a generic term owned by "WiFi Alliance" which refers to any Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard.
This presentation is prepared as reference of "E-Commerce Infrastructure" for BBA 6th Semester Students of Prime College. Document includes general introduction of WiFi Technology, WiFi Specification, advantages of WiFi and so on. Resources from various portals and slides from other authors has been used as reference.
WiFi stands for Wireless Fidelity. WiFiIt is based on the IEEE 802.11 family of standards and is primarily a local area networking (LAN) technology designed to provide in-building broadband coverage.
Current WiFi systems support a peak physical-layer data rate of 54 Mbps and typically provide indoor coverage over a distance of 100 feet.
WiFi has become the de facto standard for last mile broadband connectivity in homes, offices, and public hotspot locations. Systems can typically provide a coverage range of only about 1,000 feet from the access point.
Wi-Fi (Wireless Fidelity) is a generic term owned by "WiFi Alliance" which refers to any Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard.
This presentation is prepared as reference of "E-Commerce Infrastructure" for BBA 6th Semester Students of Prime College. Document includes general introduction of WiFi Technology, WiFi Specification, advantages of WiFi and so on. Resources from various portals and slides from other authors has been used as reference.
WiFi stands for Wireless Fidelity. WiFiIt is based on the IEEE 802.11 family of standards and is primarily a local area networking (LAN) technology designed to provide in-building broadband coverage.
Current WiFi systems support a peak physical-layer data rate of 54 Mbps and typically provide indoor coverage over a distance of 100 feet.
WiFi has become the de facto standard for last mile broadband connectivity in homes, offices, and public hotspot locations. Systems can typically provide a coverage range of only about 1,000 feet from the access point.
This presentation gives brief description of Wi-Fi Technolgy, standards, applications,topologies, how Wi-Fi network works, security,advantages and innovations.
Member Name: Alvin Tse
Service Site: Pui Tak Center
Site Location: Chicago, IL
Project Description:
Alvin Tse spent his TechMission Corps service year with the Pui Tak Center in Chicago, IL. At Pui Tak Center, Alvin helped establish various tech based resources with a specific emphasis on online maintenance.
Alvin's final project is a PowerPoint presentation on the various functions of wireless networks. It details various types of networks and illustrates their functions.
This presentation gives brief description of Wi-Fi Technolgy, standards, applications,topologies, how Wi-Fi network works, security,advantages and innovations.
Member Name: Alvin Tse
Service Site: Pui Tak Center
Site Location: Chicago, IL
Project Description:
Alvin Tse spent his TechMission Corps service year with the Pui Tak Center in Chicago, IL. At Pui Tak Center, Alvin helped establish various tech based resources with a specific emphasis on online maintenance.
Alvin's final project is a PowerPoint presentation on the various functions of wireless networks. It details various types of networks and illustrates their functions.
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- Many mobile operators have invested heavily in 3G systems.
Multiple technologies will co-exist as they meet different needs
Mobility may become a powerful differentiating factor when competing with DSL or Cable
This pesentation explains some topics realated to the computer networking...
Basically we are covering the following areas...
1. Ethernet Technology and its Evolution
2. Wireless Networking Technologies
3. IPv4 and IPv6 Coexistence
This will help the students to get a good idea about Computer Networking field...
3. Wi-Fi Tech. Agenda
Introduction
Purpose
Wi-Fi Alliance
The Wi-Fi Technology
Elements of a WI-FI Network
How a Wi-Fi Network Works
Wi-Fi Network Topologies
Wi-Fi Configurations
Wi-Fi Applications
Wi-Fi Security
Authentication
Advantages & Disadvantages
4. Intro.
• 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.
Wi-Fi works on physical and data link layer.
5. Purpose
The purpose of Wi-Fi is to hide complexity
by enabling wireless access to applications
and data, media and streams.
The main aims of Wi-Fi are the following:
make access to information easier
ensure compatibility and co-existence of
devices
eliminate cabling and wiring
eliminate switches, adapters, plugs, pins
and connectors
6. Wi-Fi Alliance
The Alliance promotes standards with the aim of
improving the interoperability of wireless local
area network products based on the IEEE 802.11
standards. The Wi-Fi Alliance, a consortium of
separate and independent companies, agrees on
a set of common interoperable products based on
the family of IEEE 802.11 standards.The Wi-Fi
Alliance certifies products via a set of defined
test-procedures to establish interoperability. The
Wi-Fi Alliance initially complicated matters by
stating that it actually stood for "Wireless
Fidelity", as with the advertising slogan"The
Standard for Wireless Fidelity", but later removed
the phrase from their marketing.
7. 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 802.11n
8. 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.
9. 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
10. 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’
11. 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.
12. 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 up to 300
feet.
• Many access points can be connected to each
other via Ethernet cables to create a single large
network.
14. 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.
15. 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.
16. 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.
17. Wi-Fi Configurations
Wi-Fi is composed of three main sectors:
Home (individual residences and
apartment buildings)
Public (Round about 70,000 “hotspots”
through out the world.)
Enterprise (corporations, universities,
office parks)
23. Wi-Fi Applications
• Home
• Small Businesses or SOHO
• Large Corporations & Campuses
• Health Care
• Wireless ISP (WISP)
• Travellers
24. Wi-Fi Security
The requirements for Wi-Fi network
security can be broken down into two
primary components:
• Authentication
• Privacy
25. Wi-Fi Security Techniques
• Service Set Identifier (SSID)
• Wired Equivalent Privacy (WEP)
• 802.1X Access Control
• Wireless Protected Access (WPA)
• IEEE 802.11i
26. 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
27. Advantages
• Mobility
• Ease of Installation
• Flexibility
• Cost
• Reliability
• Security
• Use unlicensed part of the radio spectrum
• Roaming
• Speed