13 cov npe neeg siv yog ib qho kev txwv ntawm IPv4
DNS root name servers txhais URLs rau hauv IP chaw . Cov hauv paus servers no yog ib lub network ntawm 175,000 servers hauv lub teb chaws thoob ntiaj teb. Txawm li cas los, ua ke lawv muaj npe raws li 13 cov npe nyob hauv DNS cheeb tsam.
Muaj ob peb yam hauv Internet Domain Name System siv raws nraim 13 DNS servers nyob rau hauv lub hauv paus ntawm nws lub hierarchy: Tus naj npawb 13 raug xaiv raws li ib tug nyuaj nruab nrab ntawm network kev ntseeg tau thiab kev ua tau zoo, thiab 13 yog raws li ib tug constraint ntawm Internet Protocol (IP) version 4 (IPv4).
Thaum tsuas yog 13 xaiv DNS root neeg rau zaub mov npe nyob rau IPv4, qhov tseeb, txhua ntawm cov npe no nruab nrab yog tsis muaj ib lub computer, tiam sis tsis yog ib lub koom txoos pawg ntawm ntau lub computer. Qhov kev siv clustering tsub kom qhov kev cia siab ntawm DNS tsis muaj cov nyhuv tsis zoo ntawm nws qhov kev ua tau zoo.
Vim tias tus qauv IP version 6 tus qauv tsis muaj qhov kev txwv tsis pub tsawg tshaj ntawm tus neeg ntawm cov ntaub ntawv datagrams, peb tuaj yeem xav tias yav tom ntej DNS yuav, dhau sij hawm, muaj ntau lub hauv paus servers los txhawb IPv6.
DNS IP Packets
Vim tias cov haujlwm ua haujlwm DNS cia siab rau ntau tus neeg ntawm lwm tus neeg siv internet nrhiav tau lub hauv paus servers txhua lub sijhawm, qhov chaw nyob rau cov hauv paus servers yuav tsum muab faib rau IP ua tau zoo tshaj plaws. Hom phiaj, tag nrho cov IP chaw yuav tsum haum rau hauv ib pob ntawv ( datagram ) kom tsis txhob muaj nyiaj siv ua haujlwm ntawm xa ntau cov lus ntawm cov neeg siv khoom.
Nyob hauv IPv4 niaj hnub siv, cov ntaub ntawv hauv DNS uas haum rau hauv ib pob ntawv tsuas yog me me li 512 bytes tom qab rho tawm tag nrho lwm qhov kev txhawb nqa cov ntaub ntawv muaj nyob rau hauv cov pob ntawv. Txhua IPv4 chaw nyob yuav tsum muaj 32 bytes. Raws li, cov designers ntawm DNS xaiv 13 raws li tus naj npawb ntawm cov cag servers rau IPv4, noj 416 bytes ntawm ib pob ntawv thiab tawm mus txog 96 bytes rau lwm cov ntaub ntawv txhawb thiab qhov yooj ntxiv ntxiv ob peb DNS root servers nyob rau hauv lub neej yav tom ntej yog tias xav tau. I do not know
Siv DNS siv
Lub hauv paus DNS lub npe servers tsis yog txhua qhov uas tseem ceeb rau nruab nrab lub computer siv. Tus xov tooj 13 kuj tsis txwv cov DNS servers koj siv tau rau koj li. Nyob rau hauv qhov tseeb, muaj ntau ntau cov pej xeem siv tau DNS servers uas leej twg yuav siv los hloov cov DNS servers uas ib yam ntawm lawv cov cuab yeej siv.
Piv txwv li, koj tuaj yeem ua koj lub ntsiav tshuaj siv lub Cloud Server DNS kom koj cov ntawv thov hauv internet tau khiav los ntawm cov neeg siv DNS ntawd tsis yog ib qho txawv xws li Google. Qhov no tej zaum yuav pab tau yog Google tus neeg rau zaub mov poob qis los yog koj pom tias koj tuaj yeem tuaj yeem xa tuaj rau lub web sai siv Cloudfare tus neeg siv DNS.