Ethernet thiab Network Hubs piav qhia
Hauv computer networking, lub hub yog ib qho me, yooj yim, pheej yig hluav taws xob ntaus ntawv uas koom ntau lub computer ua ke.
Mus txog thaum 2000s, Ethernet hub tau siv rau kev sib tham hauv tsev vim yog lawv yooj yim thiab tsawg. Txawm tias cov kev sib txuas hauv broadband tau hloov hauv lawv lub tsev, cov hub tseem pab tau lub hom phiaj. Dhau li Ethernet, ob peb lwm hom kev tes hauj lwm hub muaj nyob nrog USB hubs.
Yam ntxwv ntawm Ethernet Hub
Ib lub hub yog ib lub thawv ntawv, feem ntau yog ua los ntawm cov yas, uas tau txais nws lub hwj chim los ntawm lub qhov hluav taws xob zoo tib yam. Ib qho chaw sib txuas nrog ntau lub computer (los yog lwm yam khoom siv network) ua ke los ua ib qho kev sib koom ua ke. Nyob rau ntawm lub vev xaib no, txhua lub tshuab hlwb hlau sib txuas lus ncaj qha mus rau ib leeg.
Ethernet hubs sib txawv nyob hauv kev ceev (cov ntaub ntawv sib sau los yog cov ntaub ntawv bandwidth ) lawv txhawb. Thawj Ethernet hub tsuas muaj 10 Mbps ceev ceev. Cov hom tshiab dua tshiab muaj 100 Mbps thiab feem ntau yog muab cov 10 Mbps thiab 100 Mbps ua tau haujlwm (yog li ob-ceev lossis 10/100 hubs).
Tus nab npawb ntawm cov chaw nres nkoj ntawm Ethernet qhov kev txhawb nqa kuj yog qhov txawv. Plaub- thiab tsib qhov chaw Ethernet hub yog cov hauv feem ntau hauv cov tuam txhab hauv tsev, tab sis nyob hauv ib qho chaw hauv tsev thiab chaw ua hauj lwm me me muaj yim thiab 16 chaw nres nkoj. Kev sib tw tuaj yeem sib txuas tau rau ib leeg kom ntxiv tag nrho cov khoom siv nruab nrab ntawm lub hub hub.
Cov hub hauv Ethernet loj kuj loj me thiab qee zaum qis qis thaum lawv muaj cov kiv cua hauv tsev txias kom txias txias. Cov khoom siv niaj hnub nim no muaj ntau yam me me, tsim kom muaj kev sib haum xeeb, thiab tsis muaj teebmeem.
Passive, Active thiab Intelligent Hubs
Peb theem pib ntawm cov hubs muaj nyob:
- passive
- nquag
- ntse
Cov pas dej ua ke tsis ua raws li cov hluav taws xob ntawm cov khoom ntim khoom ua ntej tshaj tawm rau lub network. Lub hub hub , ntawm qhov tod tes, tsis ua qhov kev hloov no, raws li ib hom sib txawv ntawm cov khoom siv network uas hu ua repeater . Qee cov tib neeg siv cov ntsiab lus concentrator thaum xa mus rau lub hub thiab lub caij nyoog multiport dua thaum xa mus rau lub hub.
Cov ntse ntse ntse ntxiv cov nta ntxiv rau lub hub uas yog tseem ceeb rau kev lag luam. Lub ntse ntse tshaj yog feem ntau yog ua tau (ua nyob rau hauv xws li ib txoj kev uas ntau qhov chaw yuav raug muab tso rau ib qho nyob rau sab saum toj ntawm lwm qhov kom txuag chaw). Kev txawj ntse Ethernet hub kuj feem ntau muaj xws li kev tswj cov chaw taws teeb ntawm SNMP thiab virtual LAN (VLAN) .
Ua haujlwm nrog Ethernet Hub
Yuav tsum koom tes, ib pawg ntawm cov computers uas siv lub tshuab hluav taws xob Ethernet, ua ntej xa ib qho hluav taws xob Ethernet mus rau hauv lub tsev, ces txuas lwm qhov kawg ntawm kab rau txhua lub computer's network interface card (NIC) . Tag nrho Ethernet hub txais lub RJ-45 connectors ntawm tus qauv hluav taws xob hluav taws xob.
Txhawm rau tsim kom tau ib lub network kom haum rau ntau dua li, Ethernet hubs kuj tuaj yeem txuas rau txhua lwm tus, hloov chaw , los yog rau cov txheej txheem .
Thaum Yuav tsum muaj Ethernet Hub
Ethernet hubs ua haujlwm raws li Layer 1 khoom siv hauv OSI qauv . Txawm hais tias cov hubs piv rau kev ua haujlwm, ze li txhua yam khoom siv hluav taws xob Ethernet network niaj hnub no siv cov kev hloov tshuab siv hluav taws xob , vim qhov kev kawm tau ntawm cov keyboards. Lub hub yuav siv tau rau lub sij hawm hloov qhov kev hloov tawg network lossis thaum kev ua haujlwm tsis yog qhov tseem ceeb hauv lub network.