Txheej 2 cov keyboards feem ntau yog siv los txuas cov khoom siv sib txuas hauv network thiab cov neeg siv khoom siv hauv Ethernet los txheeb xyuas thiab xa MAC chaw nyob hauv cov ntawv ntim. Txawm li cas los xij, nrog kev nce rau hauv kev sib txawv ntawm cov kev siv network thiab kev tsim kho ntawm kev sib koom ua ke hauv network, daim ntawv thov ntawm cov txheej txheem 3 tau hloov mus rau hauv cov chaw zov me nyuam, cov koom haum complex, cov ntawv thov kev lag luam thiab txawm tias siab cov neeg siv tes haujlwm.
Txheej thib 2 thiab Txheej 3 keyboards yog dab tsi?
Feem ntau, OSI tus qauv tau muab faib ua xya txheej: daim ntawv thov txheej, txheej txheem nthuav qhia, txheej ntu, thauj txheej, txheej network, cov ntaub ntawv txuas txheej thiab lub cev txheej. Qhov ob-txheej hloov mus ua haujlwm rau lub txheej txheej thib ob (cov ntaub ntawv txuas txheej) ntawm OSI tus qauv, yog li nws hu ua ob-txheej hloov. Lub luag haujlwm tseem ceeb suav nrog kev nyob ntawm lub cev, kev tshuaj xyuas yuam kev, kab ntu thiab ntws tswj. Qhov peb-txheej hloov yog nyob rau ntawm txheej txheej thib peb (network txheej) thiab yog ib qho khoom siv nrog peb-txheej hloov mus ua haujlwm, uas yog, ob-txheej hloov mus nrog peb-txheej txoj kev ua haujlwm, tab sis nws yog kev sib xyaw ntawm qhov ob, thiab nws tsis yog yooj yim router ntaus ntawv xwb. Tus kho vajtse thiab software yog superimposed ntawm LAN hloov.
Qhov sib txawv ntawm Txheej 2 thiab Txheej 3 keyboards
Lub ntsiab sib txawv ntawm Txheej 2 thiab Txheej 3 cov keyboards seb lawv puas muaj kev ua cov haujlwm. Qhov thib ob txheej hloov yog cov ntaub ntawv txuas txheej txheej, uas tuaj yeem txheeb xyuas MAC chaw nyob cov ntaub ntawv hauv pob ntawv cov ntaub ntawv, xa mus rau nws raws li MAC chaw nyob, thiab sau cov MAC chaw nyob thiab cov chaw nres nkoj hauv thaj chaw nyob sab hauv ntawm nws tus kheej. Qhov peb-txheej hloov yog qhov hloov nrog qee qhov ua haujlwm ntawm router. Nws ua haujlwm rau peb txheej txheej ntawm OSI network cov qauv txheej txheem: lub network txheej. Lub hom phiaj yog kom ceev cov ntaub ntawv sib pauv hauv LAN loj. Cov kev qhia routing nws kuj muaj rau lub hom phiaj no. Txoj kev ib zaug, xa ntau zaus. Ntxiv rau, Txheej 3 cov keyboards tuaj yeem ua qhov zoo li qub mus ncig thiab cov kev sib pauv ceev. Qhov no txhais tau tias Txheej 3 mus rau ob qho tib si MAC chaw nyob lub rooj thiab IP routing rooj, thiab kuj ua haujlwm ntawm kev sib txuas lus rau sab hauv-VLAN thiab pob ntawv hla ntawm VLANs sib txawv. Cov kev hloov pauv uas tsuas yog ntxiv cov kev taug kev zoo li qub hu ua tsis muaj zog Txheej 3 keyboards. Ntxiv rau kev xa cov ntaub ntawv pob, Txheej 3 cov khoom txuas tseem muaj qee cov haujlwm uas xav tau kom nkag siab txog IP chaw nyob cov ntaub ntawv ntawm cov ntaub ntawv nkag mus rau qhov hloov chaw, xws li cimging VLAN tsheb raws li IP chaw nyob ua ke siv teeb tswj cov chaw nres nkoj. Lub zog thiab kev nyab xeeb ntawm peb-txheej hloov mus tau zoo tuaj.
Thaum koj tawm tsam xaiv lub Txheej 2 lossis Txheej Txheej 3, koj yuav tsum xav txog koj cov tseev kom muaj lub network. Yog tias koj lub network yog cov ntshiab txheej Txheej 2 network, Txheej 2 hloov chaw tuaj yeem ntsib koj cov kev xav tau. Hauv cov qauv network, qhov no feem ntau hu ua txheej nkag. Yog tias koj xav tau hloov kev sib sau ua ke kom nkag mus rau ntau lub pob nyem thiab ua cov kab sib cuam tshuam ntawm VLAN, koj xav tau txheej txheej peb mus. Qhov no yog hu ua kev faib khoom faib tawm hauv cov npe thaws network.
Xaus
Hauv ntej, Txheej Txheej 2 yog siv hauv cov tes hauj lwm me hauv cheeb tsam. Nws hloov tau ceev nrawm muaj nuj nqi, ntau yam nkag mus rau hauv cov chaw nres nkoj thiab tus nqi pheej yig tau muab cov kev daws teeb meem heev rau cov neeg siv network me. Txoj haujlwm tseem ceeb tshaj plaws ntawm peb-txheej hloov mus cuag kom tau txais cov ntaub ntawv nrawm nrawm hauv thaj chaw loj hauv cheeb tsam, thiab qhov sib ntxiv ntawm cov kev sib pauv tseem ua haujlwm lub hom phiaj no.