Peb feem ntau hnov: "Sau npe rau DNS server", "Hloov chaw nyob ntawm DNS server", "Tus DNS server tsis ua haujlwm". Dab tsi yog DNS? Dab tsi yog zais rau hauv kab lus no, thiab nws tseem ceeb npaum li cas hauv cov ntsiab lus thoob plaws Is Taws Nem?
Txhua qhov chaw hauv Is Taws Nem muaj qhov chaw nyob hu ua IP chaw nyob. IP chaw nyob yog ntawm daim ntawv no: 111.111.111.111. Nyob rau hauv dav dav, cov no yog 4 tus xov tooj, hu ua octets, sib cais los ntawm ib teev. Tsis muaj lub sijhawm xav tau tom qab lub octet dhau los. Cov lej tuaj yeem yog li 0 txog 255.
Thov nco ntsoov tias thaum peb sim nkag mus rau lub xaib, peb tsis ntaus tus IP chaw nyob, tab sis lub npe sau npe. Piv txwv mail.ru, yandex.ru, rambler.ru thiab hais txog. Nws puas yooj yim dua rau koj nco ntsoov lub npe zoo dua li qee qhov ua lej?
Txhawm rau khaws lub hauv paus ntawm kev sib nug lus ntawm tus IP chaw nyob thiab cov npe sau npe, DNS (Domain Name System) txoj kev tsim tau. Qhov system no hloov ob lub npe sau npe rau IP chaw nyob thiab ua qhov hloov pauv rov qab - los ntawm tus IP chaw nyob rau lub npe sau npe. DNS neeg rau zaub mov chaw nyob tuaj yeem tso npe nyob rau hauv Is Taws Nem cog. Nws tuaj yeem xa tawm sai sai. Yog tias DNS server poob qis rau qee qhov laj thawj, ces qhov kev sib txuas hauv Is Taws Nem yuav tsis muaj kev cuam tshuam, tab sis tsis muaj lub npe sau npe tuaj yeem raug daws rau qhov chaw nyob IP. Cias muab, thaum ntaus tus sau lub npe ntawm txhua lub xaib hauv browser, tus neeg siv yuav tau txais qhov yuam kev.
DNS yog ib qho tseem ceeb rau kev ua haujlwm ntawm txhua tus Is Taws Nem. Yog tias nws tsis yog rau cov kab ke no, lub luag haujlwm ntawm tus thawj yuav tsum raug muab tshem tawm kom zoo. Tsuas muaj IP-chaw nyob, uas tsis yooj yim rau kev xa mus rau lwm tus, thiab nco ntsoov txawm tias 1 chaw nyob yog qhov nyuaj ntau dua li nco ntsoov lub npe ntawm lub xaib.
