Nrog rau kev txhim kho dav dav thiab kev siv tshuab network, kev txhim kho ntawm cov keyboards kuj tau hloov pauv zoo. Cov keyboards ntxov tshaj plaws tau tsim los ntawm cov keyboards yooj yim heev rau txheej 2 keyboards, thiab tom qab ntawd los ntawm txheej 2 hloov mus rau txheej 3 hloov. Yog li, dab tsi yog aTxheej 3 hloov?

Txheej 3 keyboardsyog qhov tseeb txheej 2 hloov tshuab + Txheej 3 xa khoom thev naus laus zis. Nws tsis txhais hais tias muaj "peb txheej" ntawm cov keyboards. Atxheej 3 switchyog ib qho kev hloov nrog qee qhov haujlwm ntawm router. Lub hom phiaj tseem ceeb tshaj plaws ntawm covTxheej 3 hloovyog los pab txhawb kev sib pauv ntaub ntawv hauv LAN loj. Txoj haujlwm routing nws kuj tau muab kev pabcuam rau lub hom phiaj no, thiab nws tuaj yeem raug xa mus ib zaug thiab xa mus rau ntau zaus.

Hloov tshuab nyob rau hauv cov kev xav ib txwm ua hauj lwm nyob rau hauv lub thib ob txheej ntawm OSI network qauv qauv - cov ntaub ntawv txuas txheej, thaum peb txheej hloov tshuab ua tiav cov high-ceev xa mus rau cov ntaub ntawv packets ntawm lub thib peb txheej ntawm lub network qauv. Kev sib txuas ib ntus xws li kev xa cov ntaub ntawv xa mus sai sai los ntawm cov khoom siv kho vajtse, tab sis cov kev pabcuam xws li kev hloov kho cov ntaub ntawv, kev saib xyuas lub rooj sib tham, kev suav suav, thiab kev lees paub kev ua tiav los ntawm software. Nws tuaj yeem tsis tsuas paub txog lub network routing muaj nuj nqi, tab sis kuj xyuas kom meej lub network kev ua tau zoo tshaj plaws rau kev sib txawv network.