16-01-2010, 09:06 AM
I need papers for wi fi technology. Can u help please?
16-01-2010, 09:06 AM
I need papers for wi fi technology. Can u help please?
17-01-2010, 10:34 AM
please read https://seminarproject.net/Thread-wifi-seminar-report where seminar report about WiFi added
enjoy...it
07-01-2011, 05:23 PM
Wi-Fi Technology.ppt (Size: 1.88 MB / Downloads: 296) Submitted By Faisal 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 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 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 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 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 AP-based topology (Infrastructure Mode) Peer-to-peer topology (Ad-hoc Mode) Point-to-multipoint bridge topology
20-01-2011, 12:54 PM
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 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. For more
03-02-2012, 12:19 PM
hi
you can refer these pages to know the details on Wi- Fi Technology https://seminarproject.net/Thread-wi-fi-...ull-report https://seminarproject.net/Thread-wi-fi-full-report https://seminarproject.net/Thread-wifi-s...ort?page=2 https://seminarproject.net/Thread-wifi-s...ort?page=3 https://seminarproject.net/Thread-wifi-s...ort?page=4
29-02-2012, 06:06 PM
pls send me the wi-fi full documentation plss
01-03-2012, 12:06 PM
hi
you can refer these pages to know the details on Wi- Fi Technology https://seminarproject.net/Thread-wi-fi-...ull-report https://seminarproject.net/Thread-wi-fi-full-report https://seminarproject.net/Thread-wifi-s...ort?page=2 https://seminarproject.net/Thread-wifi-s...ort?page=3 https://seminarproject.net/Thread-wifi-s...ort?page=4
06-09-2012, 11:29 AM
Wi-Fi
Wi-Fi.pptx (Size: 6.03 MB / Downloads: 21) Wi-Fi Alliance snapshot • International trade association of 350+ computing, handset, consumer electronics makers and service providers • Industry leader and collaboration forum, innovating for 11 years to meet the needs of a wide variety of users and use environments • Enabling worldwide Wi-Fi adoption and inclusion in a wide array of devices through testing, market building, and regulatory programs • Wi-Fi CERTIFIED™ products deliver advanced technology, the best user experience and the latest security protections Wi-Fi CERTIFIED Wi-Fi Direct is personal Wi-Fi networking that goes anywhere • Connects devices directly, with or without a Wi-Fi network or hotspot available • Makes the connection to open a world of applications, including content sharing, synch, printing, gaming and more • Easy to use and secure • Wide variety of devices from many vendors • Connects with almost any Wi-Fi CERTIFIED device • Designed for portable and stationary devices How the technology behind Wi-Fi Direct works: All Wi-Fi Direct devices include WPA2 security • Active Agreement: Connecting Wi-Fi Direct-certified devices requires active agreement: one device must request access, and device controlling the group grants permission • Partition helps ensure security: – Enterprise environment (access to printer w/o network); home (let your kid’s hacker friend connect directly for gaming rather than full access) – When cross connected to a traditional network, Wi-Fi Direct groups operate in an independent security domain • All Wi-Fi Direct-certified devices support WPA2 security protections. Only authorized devices are permitted to connect, and transmissions over the air are encrypted using government-grade AES (Advanced Encryption Standard)
20-09-2012, 04:37 PM
Wi-Fi Technology
WIFI_MONI.ppt (Size: 770 KB / Downloads: 25) 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. 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. DSSS Direct sequence signaling technique divides the 2.4 GHz band into 11 22-MHz channels. Adjacent channels overlap one another partially, with three of the 11 being completely non-overlapping. Data is sent across one of these 22 MHz channels without hopping to other channels. Data Link Layer The data link layer consists of two sublayers : Logical Link Control (LLC) Media Access Control (MAC). 802.11 uses the same 802.2 LLC and 48-bit addressing as other 802 LANs, allowing for very simple bridging from wireless to IEEE wired networks, but the MAC is unique to WLANs. Media Access Control Carrier Sense Medium Access with collision avoidance protocol (CSMA/CA) Listen before talking Avoid collision by explicit Acknowledgement (ACK) Problem: additional overhead of ACK packets, so slow performance Request to Send/Clear to Send (RTS/CTS) protocol Solution for “hidden node” problem Problem: Adds additional overhead by temporarily reserving the medium, so used for large size packets only retransmission would be expensive 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.
05-11-2012, 06:11 PM
Wi-Fi Technology
1Wi-Fi.ppt (Size: 362 KB / Downloads: 48) Wi-Fi Technology 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. 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. 802.11 Physical Layer There are three sublayers in physical layer: Direct Sequence Spread Spectrum (DSSS) Frequency Hoping Spread Spectrum (FHSS) Diffused Infrared (DFIR) - Wide angle IEEE 802.11 Data Link Layer The data link layer consists of two sublayers : Logical Link Control (LLC) Media Access Control (MAC). 802.11 uses the same 802.2 LLC and 48-bit addressing as other 802 LANs, allowing for very simple bridging from wireless to IEEE wired networks, but the MAC is unique to WLANs. 802.11 Media Access Control Carrier Sense Medium Access with collision avoidance protocol (CSMA/CA) Listen before talking Avoid collision by explicit Acknowledgement (ACK) Problem: additional overhead of ACK packets, so slow performance Request to Send/Clear to Send (RTS/CTS) protocol Solution for “hidden node” problem Problem: Adds additional overhead by temporarily reserving the medium, so used for large size packets only retransmission would be expensive Power Management MAC supports power conservation to extend the battery life of portable devices Power utilization modes Continuous Aware Mode Radio is always on and drawing power Power Save Polling Mode Radio is “dozing” with access point queuing any data for it The client radio will wake up periodically in time to receive regular beacon signals from the access point. The beacon includes information regarding which stations have traffic waiting for them The client awake on beacon notification and receive its data 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. 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. Eavesdropping Easy to perform, almost impossible to detect 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 With the right equipment, it’s possible to eavesdrop traffic from few kilometers away Wired Equivalent Privacy (WEP) Provide same level of security as by wired network Original security solution offered by the IEEE 802.11 standard Uses RC4 encryption with pre-shared keys and 24 bit initialization vectors (IV) key schedule is generated by concatenating the shared secret key with a random generated 24-bit IV 32 bit ICV (Integrity check value) No. of bits in keyschedule is equal to sum of length of the plaintext and ICV
12-11-2012, 11:29 AM
to get information about the topic "wi fi technology " full report ppt and related topic refer the link bellow https://seminarproject.net/Thread-wi-fi-technology https://seminarproject.net/Thread-wi-fi-...technology https://seminarproject.net/Thread-wi-fi-...#pid124380 |
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