Taw qhia rau Wi-Fi Wireless Networking

Cov txheej txheem:

Taw qhia rau Wi-Fi Wireless Networking
Taw qhia rau Wi-Fi Wireless Networking
Anonim

Wi-Fi tau tshwm sim ua qhov nrov tshaj plaws wireless network raws tu qauv ntawm lub xyoo pua 21st. Thaum lwm cov kev cai wireless ua haujlwm zoo dua hauv qee qhov xwm txheej, Wi-Fi thev naus laus zis muaj zog hauv tsev network, kev lag luam hauv cheeb tsam network, thiab pej xeem hotspot networks. Qee tus neeg ua yuam kev sau npe txhua yam kev sib txuas lus wireless li Wi-Fi thaum muaj tseeb Wi-Fi yog ib qho ntawm ntau cov thev naus laus zis wireless.

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Keeb Kwm thiab Hom Wi-Fi

Nyob rau xyoo 1980, lub tshuab tsim los rau kev sau npe nyiaj ntsuab wireless hu ua WaveLAN tau tsim thiab sib koom nrog lub koom haum ntawm Hluav Taws Xob thiab Hluav Taws Xob Hluav Taws Xob Pab Pawg lub luag haujlwm rau cov qauv sib txuas, hu ua Pawg 802. Cov thev naus laus zis no tau tsim kho ntxiv thaum xyoo 1990 mus txog rau thaum pawg neeg tshaj tawm tus qauv 802.11 hauv xyoo 1997.

Daim ntawv pib ntawm Wi-Fi los ntawm 1997 tus qauv txhawb nqa tsuas yog 2 Mbps kev sib txuas. Cov thev naus laus zis no tsis raug hu ua Wi-Fi txij thaum pib, ib yam nkaus; lub sij hawm ntawd tau coined ob peb xyoos tom qab vim nws muaj koob meej nce. Ib pawg txheej txheem kev lag luam tau txuas ntxiv txhim kho tus qauv txij li ntawd los, tsim ib tsev neeg tshiab ntawm Wi-Fi hu ua txuas ntxiv 802.11b, 802.11g, 802.11n, 802.11ac, thiab lwm yam. Txhua tus qauv cuam tshuam no tuaj yeem sib txuas lus nrog ib leeg, txawm tias cov qauv tshiab muaj kev ua tau zoo dua thiab ntau dua.

Wi-Fi Hardware

Wireless broadband routers feem ntau siv hauv tsev sib txuas ua haujlwm ua Wi-Fi nkag mus rau cov ntsiab lus (nrog rau lwm yam haujlwm). Ib yam li ntawd, cov pej xeem Wi-Fi hotspots siv ib lossis ntau qhov chaw nkag tau teeb tsa hauv cheeb tsam.

Cov xov tooj cua Wi-nkaus me me thiab cov kav hlau txais xov tau muab tso rau hauv cov xov tooj smartphones, laptops, tshuab luam ntawv, thiab ntau tus neeg siv khoom siv ua kom cov khoom siv no ua haujlwm raws li cov neeg siv khoom siv network. Cov ntsiab lus nkag tau teeb tsa nrog cov npe network uas cov neeg siv tuaj yeem tshawb pom thaum tshawb xyuas thaj chaw rau cov network muaj.

kab hauv qab

Hotspots yog ib hom kev tsim kho vaj tse network tsim los rau pej xeem lossis nkag mus rau hauv internet. Ntau lub wireless hotspots siv pob software tshwj xeeb los tswj cov neeg siv cov npe thiab txwv kev siv internet raws li.

Wi-Fi Network Protocols

Wi-Fi muaj cov ntaub ntawv txuas txheej txheej txheej txheem uas khiav ib qho ntawm ob peb lub cev sib txuas. Cov txheej txheem cov ntaub ntawv txhawb nqa ib qho tshwj xeeb Media Access Control raws tu qauv uas siv cov txheej txheem tiv thaiv kev sib tsoo (tshwj xeeb hu ua Carrier Sense Multiple Access with Collision Avoidance) los pab tswj ntau tus neeg siv khoom hauv lub network sib txuas lus ib zaug.

Wi-Fi txhawb nqa lub tswv yim ntawm cov channel zoo ib yam li cov TV. Txhua qhov Wi-Fi channel ntiav cov zaus tshwj xeeb hauv cov teeb liab loj dua (2.4 GHz lossis 5 GHz). Qhov kev tsim vaj tsev no tso cai rau cov tes hauj lwm hauv zos nyob ze ntawm lub cev kom sib txuas lus yam tsis muaj kev cuam tshuam rau ib leeg. Wi-Fi raws tu qauv tseem sim qhov zoo ntawm cov teeb liab ntawm ob lub cuab yeej thiab kho qhov kev sib txuas cov ntaub ntawv tus nqi qis yog tias xav tau los ua kom muaj kev ntseeg siab. Cov txheej txheem tsim nyog tau muab tso rau hauv cov cuab yeej tshwj xeeb firmware ntsia los ntawm cov chaw tsim khoom.

Rau qhov tob tob rau hauv txoj kev sib txuas lus no ua haujlwm li cas, tshawb xyuas ntau Cov Lus Qhia Tseem Ceeb Txog Yuav Ua Li Cas Wi-Fi Ua Haujlwm.

Cov Teebmeem Feem Ntau Nrog Wi-Fi Networks

Tsis muaj thev naus laus zis zoo meej, thiab Wi-Fi muaj nws cov kev txwv. Cov teeb meem tshwm sim nrog Wi-Fi tes hauj lwm suav nrog:

  • Kev ruaj ntseg: Kev sib txuas hauv xov tooj xa mus thoob Wi-Fi tes hauj lwm dhau los ntawm huab cua qhib, ua rau nws yooj yim rau snooping. Ntau hom Wi-Fi kev ruaj ntseg thev naus laus zis tau ntxiv rau Wi-Fi ntau xyoo los pab daws qhov teeb meem no, txawm tias qee qhov ua haujlwm zoo dua li lwm tus.
  • Signal range: Ib qho yooj yim Wi-Fi network nrog ib qho chaw nkag wireless mus txog ntawm feem ntau tsuas yog ob peb puas taw (100m lossis tsawg dua) nyob rau txhua qhov kev taw qhia. Kev nthuav dav ntawm Wi-nkaus network yuav tsum txhim kho cov ntsiab lus nkag ntxiv uas tau teeb tsa los sib txuas lus nrog ib leeg, uas yuav kim thiab nyuaj rau kev txhawb nqa, tshwj xeeb tshaj yog sab nraum zoov. Raws li nrog rau lwm cov kev cai wireless, teeb liab cuam tshuam (los ntawm lwm yam khoom siv wireless, lossis los ntawm kev cuam tshuam ntawm lub cev xws li phab ntsa) tuaj yeem txo qis qhov ua tau zoo ntawm Wi-Fi thiab nws qhov kev ntseeg tau tag nrho.

Pom zoo: