Introduction to Wi

8/13/2019 Introduction to Wi

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Introduction to Wi -Fi Ryan Steele Jul 08, 2011Share this article:

Most people associate the term "Wi-Fi" with the ability to browse the Internet wirelessly.Though this definition isn't technically incorrect, there is so much more to Wi-Fi wirelesstechnology than just browsing the Internet. Ten years ago, no one would have thought that itwould be possible to listen to music from your basement computer on your entertainment systemupstairs, or download songs to your Wi-Fi-enabled MP3 player, but Wi-Fi technology has madeit possible to do not only these, but a host of other applications as well.

With Wi-Fi, you can wirelessly stream photos, videos, and music from yourcomputer to your compatible TV, Blu-ray player, and other devices.

What is Wi-Fi?

Short for "wireless fidelity", Wi-Fi is one of the most popular wireless communication standardson the market. Wi-Fi is technically a trademarked brand name for the wireless standard owned by the Wi-Fi Alliance, much like Bluetooth is trademarked by the Bluetooth Special InterestGroup. In its fledgling stages, Wi-Fi technology was almost solely used to wirelessly connectlaptop computers to the Internet via local area networks (LANs), but thanks to the immenseflexibility the technology provides, that's no longer the case. Wi-Fi technology is now found in host of non-computer electronic devices as well, such as home theater receivers, video gameconsoles, Blu-ray players, digital cameras, and even GPS devices.
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Wireless StandardsThe official name for the specification is IEEE 802.11, and it is comprised of more than 20different standards, each of which is denoted by a letter appended to the end of the name. Themost familiar standards are 802.11b and 802.11g (Wireless B and G) which are used in themajority of commercial Wi-Fi devices. Both of these standards operate in the 2.4 GHz band, and

the only major difference between the two is the transfer rate (see chart below).Some consumer electronics, however, use a different standard Wireless A. These devicesoperate within the 5 GHz range and have transfer rates equivalent to 802.11g. However, sincethey operate on different frequencies, devices using the 802.11a standard cannot communicatewith B and G-enabled devices.

The newest standard, dubbed 802.11n, was designed to replace all three of the previousstandards. It's up to five times faster than 802.11g, with a range almost twice as far. It also addsmultiple-input multiple-output (MIMO) technology, which uses multiple antennas to increasedata transfer rates. The 802.11n standard was drafted to allow up to four channel configurations

with potential speeds up to 600 Mb/sec. It's becoming increasingly popular for its high speeds,which allow for smoother audio and video streaming among devices.

Comparison of standardsThe table below provides a brief overview of the four most popular current 802.11 standards.

Standard Frequency Data Transfer Rate Typical (Max) Range (indoor)802.11a 3.7/5 GHz 20 (54) Mb/sec about 35 m (115 ft)802.11b 2.4 GHz 5.5 (11) Mb/sec 38 m (125 ft)802.11g 2.4 GHz 22 (54) Mb/sec 38 m (125 ft)

802.11n 2.4/5 GHz 110+ (300+) Mb/sec 70m (230ft)Advantages of Wi-Fi

Now that we've covered the basics of the technology, let's check out some of the advantages WiFi has over its wireless (and wired) competition.

Unparalleled mobility and flexibilityIf you've ever installed a multi-room stereo and had to run wires through a wall, you know theamount of time and effort it requires, not to mention the permanence of your installation. If youwant to move the receiver to another room, the wiring has to be completely redone, and the hol

patched.Thanks to Wi-Fi, users are no longer confined by the cords that link their devices, enabling newlevels of connectivity without sacrificing function or design options. Products like networkmusic players use Wi-Fi technology to wirelessly stream your music to speakers locatedthroughout your house. Some systems are different than others, but typically you can listen to thsame, or different music in each room, play music from your computer or other devices attacheto the network, and even listen to Internet radio.
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Quick, easy setupSetting up a wireless network may sound like a daunting task, but it's actually a prettystraightforward process. Wi-Fi networks don't require professional installation, and, best of all,there are no holes to drill or wires to run through walls. Many new routers are "plug-and-play,"meaning you just connect them to a power outlet, plug in an Ethernet cord, and voil your

network has been created. Unfortunately, wireless security doesn't automatically configure itselso it's important to remember to enable it via a personal computer once a connection to thewireless network has been established. (We'll touch on this topic more in-depth in the limitationsection.)

Fast data transfer ratesWith transfer speeds around 150 megabits (Mb) per second (18.75 megabytes), 802.11n iscurrently the fastest commercially available Wi-Fi protocol on the market. It's more than capablof handling the demands of streaming high-definition TV signals, as well as CD-quality audio.

For information about the kinds of services you can stream through your TV, check out our

article on Enjoying the Internet on your TV. Limitations of Wi-Fi

So far we've covered some of the advantages offered by Wi-Fi wireless technology, but there arsome limitations that must be addressed as well. Security and interference are the main issueswith current Wi-Fi standards.

Security concernsThough typically very easy to set up, securing your Wi-Fi network requires a bit more effort. WFi access points do not come with encryption straight out of the box; you have to do it from your

computer once the network is up and running. An unsecured wireless network is susceptible toattacks from hackers, potentially giving them access to all of the information stored by thedevices on your network. In addition, "friendly," yet unauthorized computers will also be able tconnect to your network, occupying the bandwidth and hindering overall network performance.

Interference from other devicesWi-Fi transmissions take place primarily within the 2.4 GHz spectrum, making them susceptiblto interference from Bluetooth wireless enabled devices, cordless telephones, microwaveovens, baby monitors, and other household devices. The farther your Wi-Fi devices are locatedfrom these known interferences and the closer they are to one another the more robust yoursignal will be, so keep that in mind during setup.

If you live in an apartment complex or in close proximity to your neighbors, their wirelessnetwork can also be a source of interference. Some newer routers automatically select thechannel with the least amount of interference, ensuring that you get the best possible connection

Securing your Wi-Fi network
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The best choice for wireless network encryption is currently Wi-Fi Protected Access (WPA2). Most newer access points support WPA2 encryption, and it can be configured once your networhas been set up. For more security tips, check out our article on creating a home network .

Bluetooth wireless technology, on the other hand, has security built in, and it automatically

requires devices to enter a passkey in order to connect to the network. See our introduction toBluetooth for more information on how Bluetooth works.

Current Wi-Fi Applications

As Wi-Fi-enabled devices have become more and more popular, wired devices are quickly becoming a thing of the past. Check out some of the new ways that Wi-Fi is being used below.

Apple AirPlayOne of Apple's latest technologies is AirPlay a proprietary wireless media streaming systemfor use with devices that use iTunes 10 (such as a computer or iPhone) and a variety of

compatible audio and video components. AirPlay lets you stream music, photos, and video storon your computer, iPad, iPhone, or iPod touch to your receiver or TV via Apple's Apple TVYou can also stream music to any AirPlay-enabled device, like a speaker or receiver.

Imagine watching a TV show that you bought on your iPad streamed through your TV's bigscreen. Or listening to PANDORA Internet radio on an AirPlay-compatible speaker in anotheroom in your home, streamed through your iPhone. And let's not forget how great your tunes wsound when you stream them through your home theater system, using your iPod touch as aremote.

To find out more about AirPlay, check out Ralph's blog post.

Whole-house connectivityYou can do a variety of things over Wi-Fi that you might not expect. For example, you can listeto music in multiple rooms in your home on wireless speakers; print documents anywhere inyour house with a wireless printer ; and update your Wi-Fi-enabled digital photo frame withouteven hooking up a camera or memory card. Plus, the possibilities are continuing to grow.

We carry an assortment of Wi-Fi products to get you started. Keep a look out for more offeringsas Wi-Fi becomes even more popular. Wires? They're so pass.

Advantages [edit source | edit ]

Wi-Fi allows cheaper deployment of local area networks (LANs). Also spaces where cablescannot be run, such as outdoor areas and historical buildings, can host wireless LANs.

Manufacturers are building wireless network adapters into most laptops. The price of chipsets forWi-Fi continues to drop, making it an economical networking option included in even moredevices.[citation needed ]
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Different competitive brands of access points and client network-interfaces can inter-operate at basic level of service. Products designated as "Wi-Fi Certified" by the Wi-Fi Alliance are backwards compatible. Unlike mobile phones, any standard Wi-Fi device will work anywhere inthe world.

Wi-Fi Protected Access encryption (WPA2) is considered secure, provided a strong passphrase isused. New protocols forquality-of-service (WMM) make Wi-Fi more suitable for latency-sensitive applications (such as voice and video). Power saving mechanisms (WMM Power Saveextend battery life.

Limitations [edit source | edit ]

Spectrum assignments and operational limitations are not consistent worldwide: most of Europeallows for an additional two channels beyond those permitted in the US for the 2.4 GHz band (1 13 vs. 1 11), while Japan has one more on top of that (1 14). As of 2007, Europe is essentiallyhomogeneous in this respect.

A Wi-Fi signal occupies five channels in the 2.4 GHz band. Any two channel numbers that diff by five or more, such as 2 and 7, do not overlap. The oft-repeated adage that channels 1, 6, and11 are theonly non-overlapping channels is, therefore, not accurate. Channels 1, 6, and 11 arethe only group of three non-overlapping channels in the U.S. In Europe and Japan usingChannels 1, 5, 9, and 13 for 802.11g and 802.11n is recommended.[citation needed ]

Equivalent isotropically radiated power (EIRP) in the EU is limited to 20 dBm (100 mW).

The current 'fastest' norm, 802.11n, uses double the radio spectrum/bandwidth (40 MHz)compared to 802.11a or 802.11g (20 MHz).[citation needed ] This means there can be only one

802.11n network on the 2.4 GHz band at a given location, without interference to/from otherWLAN traffic. 802.11n can also be set to use 20 MHz bandwidth only to prevent interference indense community.[citation needed ]

Range [edit source | edit ]

See also: Long-range Wi-Fi

Wi-Fi networks have limited range. A typical wireless access point using 802.11b or 802.11g with a stock antenna might have a range of 35 m (120 ft) indoors and 100 m (300 ft) outdoors.IEEE 802.11n, however, can more than double the range.[41] Range also varies with frequency

band. Wi-Fi in the 2.4 GHz frequency block has slightly better range than Wi-Fi in the 5 GHzfrequency block which is used by 802.11a and optionally by 802.11n. On wireless routers withdetachable antennas, it is possible to improve range by fitting upgraded antennas which havehigher gain in particular directions. Outdoor ranges can be improved to many kilometers througthe use of high gain directional antennas at the router and remote device(s). In general, themaximum amount of power that a Wi-Fi device can transmit is limited by local regulations, sucas FCC Part 15 in the US.
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Due to reach requirements for wireless LAN applications, Wi-Fi has fairly high powerconsumption compared to some other standards. Technologies such as Bluetooth (designed tosupport wireless PAN applications) provide a much shorter propagation range between 1 and100m[42] and so in general have a lower power consumption. Other low-power technologies suchas ZigBee have fairly long range, but much lower data rate. The high power consumption of Wi-

Fi makes battery life in mobile devices a concern.Researchers have developed a number of "no new wires" technologies to provide alternatives toWi-Fi for applications in which Wi-Fi's indoor range is not adequate and where installing newwires (such as CAT-6) is not possible or cost-effective. For example, the ITU-T G.hn standardfor high speed Local area networks uses existing home wiring(coaxial cables, phone lines and power lines). Although G.hn does not provide some of the advantages of Wi-Fi (such as mobilityor outdoor use), it's designed for applications (such as IPTV distribution) where indoor range ismore important than mobility.

Due to the complex nature of radio propagation at typical Wi-Fi frequencies, particularly the

effects of signal reflection off trees and buildings, algorithms can only approximately predict WFi signal strength for any given area in relation to a transmitter .[43] This effect does not applyequally to long-range Wi-Fi, since longer links typically operate from towers that transmit abovethe surrounding foliage.

The practical range of Wi-Fi essentially confines mobile use to such applications as inventory-taking machines in warehouses or in retail spaces, barcode-reading devices at check-out stands,or receiving/shipping stations. Mobile use of Wi-Fi over wider ranges is limited, for instance, touses such as in an automobile moving from one hotspot to another. Other wireless technologiesare more suitable for communicating with moving vehicles.

Data security risks [edit source | edit ] The most common wireless encryption-standard, Wired Equivalent Privacy (WEP), has beenshown to be easily breakable even when correctly configured. Wi-Fi Protected Access (WPA andWPA2) encryption, which became available in devices in 2003, aimed to solve this problem. WFi access points typically default to an encryption-free (open ) mode. Novice users benefit from azero-configuration device that works out-of-the-box, but this default does not enable anywireless security, providing open wireless access to a LAN. To turn security on requires the userto configure the device, usually via a software graphical user interface (GUI). On unencryptedWi-Fi networks connecting devices can monitor and record data (including personalinformation). Such networks can only be secured by using other means of protection, such as a

VPN or secure Hypertext Transfer Protocol (HTTPS) over Transport Layer Security. Interference [edit source | edit ]

For more details on this topic, see Electromagnetic interference at 2.4 GHz.

Wi-Fi connections can be disrupted or the internet speed lowered by having other devices in thesame area. Many 2.4 GHz 802.11b and 802.11g access-points default to the same channel on
http://en.wikipedia.org/wiki/Bluetoothhttp://en.wikipedia.org/wiki/Bluetoothhttp://en.wikipedia.org/wiki/Bluetoothhttp://en.wikipedia.org/wiki/Personal_area_networkhttp://en.wikipedia.org/wiki/Personal_area_networkhttp://en.wikipedia.org/wiki/Personal_area_networkhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Wi-Fi#cite_note-42http://en.wikipedia.org/wiki/Wi-Fi#cite_note-42http://en.wikipedia.org/wiki/ZigBeehttp://en.wikipedia.org/wiki/ZigBeehttp://en.wikipedia.org/wiki/ZigBeehttp://en.wikipedia.org/wiki/Category_6_cablehttp://en.wikipedia.org/wiki/Category_6_cablehttp://en.wikipedia.org/wiki/Category_6_cablehttp://en.wikipedia.org/wiki/ITU-Thttp://en.wikipedia.org/wiki/ITU-Thttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/Local_area_networkhttp://en.wikipedia.org/wiki/Local_area_networkhttp://en.wikipedia.org/wiki/Local_area_networkhttp://en.wikipedia.org/wiki/Ethernet_over_coaxhttp://en.wikipedia.org/wiki/Ethernet_over_coaxhttp://en.wikipedia.org/wiki/Ethernet_over_coaxhttp://en.wikipedia.org/wiki/Power_line_communicationhttp://en.wikipedia.org/wiki/Power_line_communicationhttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/IPTVhttp://en.wikipedia.org/wiki/IPTVhttp://en.wikipedia.org/wiki/IPTVhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Wi-Fi#cite_note-43http://en.wikipedia.org/wiki/Wi-Fi#cite_note-43http://en.wikipedia.org/wiki/Wi-Fi#cite_note-43http://en.wikipedia.org/wiki/Long-range_Wi-Fihttp://en.wikipedia.org/wiki/Long-range_Wi-Fihttp://en.wikipedia.org/wiki/Long-range_Wi-Fihttp://en.wikipedia.org/wiki/Barcodehttp://en.wikipedia.org/wiki/Barcodehttp://en.wikipedia.org/wiki/Barcodehttp://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=13http://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=13http://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=13http://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=13http://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=13http://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=13http://en.wikipedia.org/wiki/Encryptionhttp://en.wikipedia.org/wiki/Encryptionhttp://en.wikipedia.org/wiki/Encryptionhttp://en.wikipedia.org/wiki/Wired_Equivalent_Privacyhttp://en.wikipedia.org/wiki/Wired_Equivalent_Privacyhttp://en.wikipedia.org/wiki/Wired_Equivalent_Privacyhttp://en.wikipedia.org/wiki/Fluhrer,_Mantin_and_Shamir_attackhttp://en.wikipedia.org/wiki/Fluhrer,_Mantin_and_Shamir_attackhttp://en.wikipedia.org/wiki/Wi-Fi_Protected_Accesshttp://en.wikipedia.org/wiki/Wi-Fi_Protected_Accesshttp://en.wikipedia.org/wiki/Wi-Fi_Protected_Accesshttp://en.wikipedia.org/wiki/Wireless_access_pointhttp://en.wikipedia.org/wiki/Wireless_access_pointhttp://en.wikipedia.org/wiki/Wireless_access_pointhttp://en.wikipedia.org/wiki/Wireless_security#Counteracting_riskshttp://en.wikipedia.org/wiki/Wireless_security#Counteracting_riskshttp://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Virtual_private_networkhttp://en.wikipedia.org/wiki/Virtual_private_networkhttp://en.wikipedia.org/wiki/Hypertext_Transfer_Protocolhttp://en.wikipedia.org/wiki/Hypertext_Transfer_Protocolhttp://en.wikipedia.org/wiki/Hypertext_Transfer_Protocolhttp://en.wikipedia.org/wiki/HTTP_Securehttp://en.wikipedia.org/wiki/HTTP_Securehttp://en.wikipedia.org/wiki/HTTP_Securehttp://en.wikipedia.org/wiki/Transport_Layer_Securityhttp://en.wikipedia.org/wiki/Transport_Layer_Securityhttp://en.wikipedia.org/wiki/Transport_Layer_Securityhttp://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=14http://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=14http://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=14http://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=14http://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=14http://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=14http://en.wikipedia.org/wiki/Electromagnetic_interference_at_2.4_GHzhttp://en.wikipedia.org/wiki/Electromagnetic_interference_at_2.4_GHzhttp://en.wikipedia.org/wiki/Electromagnetic_interference_at_2.4_GHzhttp://en.wikipedia.org/wiki/IEEE_802.11#802.11ghttp://en.wikipedia.org/wiki/IEEE_802.11#802.11ghttp://en.wikipedia.org/wiki/IEEE_802.11#802.11ghttp://en.wikipedia.org/wiki/IEEE_802.11#802.11ghttp://en.wikipedia.org/wiki/Electromagnetic_interference_at_2.4_GHzhttp://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=14http://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=14http://en.wikipedia.org/wiki/Transport_Layer_Securityhttp://en.wikipedia.org/wiki/HTTP_Securehttp://en.wikipedia.org/wiki/Hypertext_Transfer_Protocolhttp://en.wikipedia.org/wiki/Virtual_private_networkhttp://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Wireless_security#Counteracting_riskshttp://en.wikipedia.org/wiki/Wireless_access_pointhttp://en.wikipedia.org/wiki/Wi-Fi_Protected_Accesshttp://en.wikipedia.org/wiki/Fluhrer,_Mantin_and_Shamir_attackhttp://en.wikipedia.org/wiki/Wired_Equivalent_Privacyhttp://en.wikipedia.org/wiki/Encryptionhttp://en.wikipedia.org/w/index.php?title=Wi-Fi&veaction=edit&section=13http://en.wikipedia.org/w/index.php?title=Wi-Fi&action=edit&section=13http://en.wikipedia.org/wiki/Barcodehttp://en.wikipedia.org/wiki/Long-range_Wi-Fihttp://en.wikipedia.org/wiki/Wi-Fi#cite_note-43http://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/IPTVhttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/Power_line_communicationhttp://en.wikipedia.org/wiki/Ethernet_over_coaxhttp://en.wikipedia.org/wiki/Local_area_networkhttp://en.wikipedia.org/wiki/G.hnhttp://en.wikipedia.org/wiki/ITU-Thttp://en.wikipedia.org/wiki/Category_6_cablehttp://en.wikipedia.org/wiki/ZigBeehttp://en.wikipedia.org/wiki/Wi-Fi#cite_note-42http://en.wikipedia.org/wiki/Radio_propagationhttp://en.wikipedia.org/wiki/Personal_area_networkhttp://en.wikipedia.org/wiki/Bluetooth


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initial startup, contributing to congestion on certain channels. Wi-Fi pollution, or an excessivenumber of access points in the area, especially on the neighboring channel, can prevent accessand interfere with other devices' use of other access points, caused by overlapping channels inthe 802.11g/b spectrum, as well as with decreased signal-to-noise ratio (SNR) between access points. This can become a problem in high-density areas, such as large apartment complexes or

office buildings with many Wi-Fi access points.Additionally, other devices use the 2.4 GHz band: microwave ovens, ISM band devices, securitycameras, ZigBee devices, Bluetooth devices, video senders, cordless phones, baby monitors, and(in some countries) Amateur radio all of which can cause significant additional interference. It isalso an issue when municipalities[44] or other large entities (such as universities) seek to providelarge area coverage.

Hardware[ edit source | edit ]

Standard devices [edit source | edit ]

An embedded RouterBoard 112 with U.FL-RSMA pigtail and R52 mini PCI Wi-Fi card widelyused by wireless Internet service providers(WISPs) in the Czech Republic

OSBRiDGE 3GN 802.11n Access Point and UMTS/GSM Gateway in one device
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oothhttp://en.wikipedia.org/wiki/ZigBeehttp://en.wikipedia.org/wiki/ISM_bandhttp://en.wikipedia.org/wiki/Signal-to-noise_ratio


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An Atheros Wi-Fi N draft adaptor with built in Bluetooth on a Sony Vaio E series laptop

USB wireless adapter

A wireless access point (WAP) connects a group of wireless devices to an adjacent wired LAN. An access point resembles a network hub, relaying data between connected wireless devices inaddition to a (usually) single connected wired device, most often an Ethernet hub or switch,allowing wireless devices to communicate with other wired devices.

Wireless adapters allow devices to connect to a wireless network. These adapters connect todevices using various external or internal interconnects such as PCI, miniPCI, USB, ExpressCard, Cardbus and PC Card. As of 2010, most newer laptop computers come equippedwith built in internal adapters.Wireless routers integrate a Wireless Access Point, Ethernet switch, and internal router firmwareapplication that provides IP routing, NAT, and DNS forwarding through an integrated WAN-interface. A wireless router allows wired and wireless Ethernet LAN devices to connect to a(usually) single WAN device such as a cable modem or a DSL modem. A wireless router allowsall three devices, mainly the access point and router, to be configured through one central utilityThis utility is usually an integrated web server that is accessible to wired and wireless LANclients and often optionally to WAN clients. This utility may also be an application that is run oa computer, as is the case with as Apple's AirPort, which is managed with the AirPort Utility onMac OS X and iOS.[45]

Wireless network bridges connect a wired network to a wireless network. A bridge differs froman access point: an access point connects wireless devices to a wired network at the data-linklayer . Two wireless bridges may be used to connect two wired networks over a wireless link,useful in situations where a wired connection may be unavailable, such as between two separatehomes.
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wikipedia.org/wiki/Internet_Protocolhttp://en.wikipedia.org/wiki/Network_switchhttp://en.wikipedia.org/wiki/Wireless_routerhttp://en.wikipedia.org/wiki/PC_Cardhttp://en.wikipedia.org/wiki/ExpressCardhttp://en.wikipedia.org/wiki/Universal_Serial_Bushttp://en.wikipedia.org/wiki/Wireless_network_interface_controllerhttp://en.wikipedia.org/wiki/Data_%28computing%29http://en.wikipedia.org/wiki/Ethernet_hubhttp://en.wikipedia.org/wiki/Local_area_networkhttp://en.wikipedia.org/wiki/Wireless_access_pointhttp://en.wikipedia.org/wiki/Universal_Serial_Bushttp://en.wikipedia.org/wiki/Bluetoothhttp://en.wikipedia.org/wiki/Atheros


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Wireless range-extenders or wireless repeaters can extend the range of an existing wirelessnetwork. Strategically placed range-extenders can elongate a signal area or allow for the signalarea to reach around barriers such as those pertaining in L-shaped corridors. Wireless devicesconnected through repeaters will suffer from an increased latency for each hop, as well as from reduction in the maximum data throughput that is available. In addition, the effect of additional

users using a network employing wireless range-extenders is to consume the available bandwidfaster than would be the case where but a single user migrates around a network employingextenders. For this reason, wireless range-extenders work best in networks supporting very lowtraffic throughput requirements, such as for cases where but a single user with a Wi-Fi equippedtablet migrates around the combined extended and non-extended portions of the total connectednetwork. Additionally, a wireless device connected to any of the repeaters in the chain will havea data throughput that is also limited by the "weakest link" existing in the chain between wherethe connection originates and where the connection ends. Networks employing wirelessextenders are also more prone to degradation from interference from neighboring access pointsthat border portions of the extended network and that happen to occupy the same channel as theextended network.

The security standard, Wi-Fi Protected Setup, allows embedded devices with limited graphicaluser interface to connect to the Internet with ease. Wi-Fi Protected Setup has 2 configurations:The Push Button configuration and the PIN configuration. These embedded devices are alsocalled The Internet of Things and are low-power, battery-operated embedded systems. A numbof Wi-Fi manufacturers design chips and modules for embedded Wi-Fi, such as GainSpan.[46]

Distance records [edit source | edit ]

Distance records (using non-standard devices) include 382 km (237 mi) in June 2007, held byErmanno Pietrosemoli and EsLaRed of Venezuela, transferring about 3 MB of data between the

mountain-tops of El guila and Platillon.[47][48]

The Swedish Space Agency transferred data420 km (260 mi), using 6 watt amplifiers to reach an overhead stratospheric balloon.[49]

Embedded systems [edit source | edit ]

Embedded serial-to-Wi-Fi module
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Increasingly in the last few years (particularly as of 2007), embedded Wi-Fi modules have become available that incorporate a real-time operating system and provide a simple means ofwirelessly enabling any device which has and communicates via a serial port.[50] This allows thedesign of simple monitoring devices. An example is a portable ECG device monitoring a patienat home. This Wi-Fi-enabled device can communicate via the Internet.[51]

These Wi-Fi modules are designed by OEMs so that implementers need only minimal Wi-Fiknowledge to provide Wi-Fi connectivity for their products.

Multiple access points [edit source | edit ]

Increasing the number of Wi-Fi access points provides network redundancy, support for fastroaming and increased overall network-capacity by using more channels or by defining smallercells. Except for the smallest implementations (such as home or small office networks), Wi-Fiimplementations have moved toward "thin" access points, with more of the network intelligence housed in a centralized network appliance, relegating individual access points to the role of

"dumb" transceivers. Outdoor applications may use mesh topologies.

Network security[ edit source | edit ]

The main issue with wireless network security is its simplified access to the network comparedto traditional wired networks such as Ethernet, with wired networking one must either gainaccess to a building (physically connecting into the internal network) or break through anexternal firewall. To enable Wi-Fi, one merely needs to be within the wireless range of the Wi-Finetwork. Most business networks protect sensitive data and systems by attempting to disallowexternal access. Enabling wireless connectivity reduces security if the network uses inadequateor no encryption.[52][53]

An attacker who has gained access to a Wi-Fi network router can initiate a DNS spoofing attackagainst any other user of the network by forging a response before the queried DNS server has achance to reply.[54]

Securing methods [edit source | edit ]

A common measure to deter unauthorized users involves hiding the access point's name bydisabling the SSID broadcast. While effective against the casual user, it is ineffective as asecurity method because the SSID is broadcast in the clear in response to a client SSID query.Another method is to only allow computers with known MAC addresses to join the network ,[55] but determined eavesdroppers may be able to join the network by spoofing an authorizedaddress.

Wired Equivalent Privacy (WEP) encryption was designed to protect against casual snooping butit is no longer considered secure. Tools such as AirSnort or Aircrack-ng can quickly recoverWEP encryption keys.[56] Because of WEP's weakness the Wi-Fi Alliance approved Wi-FiProtected Access (WPA) which uses TKIP. WPA was specifically designed to work with older
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equipment usually through a firmware upgrade. Though more secure than WEP, WPA hasknown vulnerabilities.

The more secure WPA2 using Advanced Encryption Standard was introduced in 2004 and issupported by most new Wi-Fi devices. WPA2 is fully compatible with WPA.[57]

A flaw in a feature added to Wi-Fi in 2007, called Wi-Fi Protected Setup, allows WPA andWPA2 security to be bypassed and effectively broken in many situations. The only remedy as olate 2011 is to turn off Wi-Fi Protected Setup,[58] which is not always possible.
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Documents

Introduction to Wi