Video: Qhov chaw nres nkoj twg siv rau DNS?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
DNS siv TCP Port 53 rau thaj chaw hloov chaw, tswj kev sib koom ua ke ntawm DNS database thiab server. Cov UDP raws tu qauv yog siv thaum tus neeg siv xa cov lus nug mus rau DNSserver. Cov TCP raws tu qauv yuav tsum tsis txhob siv rau queries asit muab ib tug ntau ntawm cov ntaub ntawv, uas yog pab tau rau toattackers.
Tsis tas li, tus lej chaw nres nkoj yog dab tsi rau DNS?
53
Ib yam li ntawd, DNS puas tuaj yeem ua haujlwm dhau TCP? DNS siv TCP rau Kev Hloov Chaw dhau Chaw nres nkoj: 53 Nws yog qhov tsim nyog rau tswj kev sib raug zoo DNS database nruab nrab DNS Cov servers. Qhov no yog tiav bythe TCP raws tu qauv. Qhov kev sib txuas lus no tshwm sim ntawm DNS Servers nkaus xwb. Zone Transfer feature ntawm DNS Server yuav ib txwm siv TCP raws tu qauv.
Cov lus nug tseem yog, yog DNS chaw nres nkoj TCP lossis UDP?
DNS siv TCP rau Zone Transfer thiab UDP rau cov lus nug npe tsis tu ncua (thawj) lossis thim rov qab. UDP tuaj yeem siv los pauv cov ntaub ntawv me me whereas TCP yuav tsum tau siv los pauv cov ntaub ntawv loj dua 512bytes.
Cov chaw nres nkoj dab tsi xav tau rau kev siv Internet?
Daim ntawv thov Ports
| Daim ntawv thov | Chaw nres nkoj | Sau ntawv |
|---|---|---|
| HTTP | 80, 8080 | Hyptertext Transfer Protocol. Siv los ntawm web browsers xws li Internet Explorer, Firefox thiab Opera. |
| HTTPS | 443 | Siv rau kev ruaj ntseg web browsing. |
| IMAP | 143 | Cov ntawv thov email suav nrog Outlook, Outlook Express, Eudoraand Thunderbird. |
| FTP | 20 rau 21 | Kev Hloov Cov Ntaub Ntawv. |
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