{"id":236,"date":"2025-06-17T00:31:46","date_gmt":"2025-06-16T17:31:46","guid":{"rendered":"https:\/\/blog.tinohost.com\/?p=236"},"modified":"2026-10-28T11:40:02","modified_gmt":"2026-10-28T04:40:02","slug":"dns-la-gi","status":"publish","type":"post","link":"https:\/\/tino.vn\/blog\/dns-la-gi\/","title":{"rendered":"DNS l\u00e0 g\u00ec? DNS d\u00f9ng \u0111\u1ec3 l\u00e0m g\u00ec, ho\u1ea1t \u0111\u1ed9ng th\u1ebf n\u00e0o v\u00e0 c\u00e1c b\u1ea3n ghi c\u1ea7n bi\u1ebft"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>DNS (Domain Name System, h\u1ec7 th\u1ed1ng ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n) l\u00e0 h\u1ec7 th\u1ed1ng chuy\u1ec3n t\u00ean mi\u1ec1n d\u1ec5 nh\u1edb nh\u01b0 tino.vn th\u00e0nh \u0111\u1ecba ch\u1ec9 IP m\u00e0 m\u00e1y t\u00ednh d\u00f9ng \u0111\u1ec3 k\u1ebft n\u1ed1i, nh\u1edd \u0111\u00f3 tr\u00ecnh duy\u1ec7t t\u00ecm \u0111\u00fang m\u00e1y ch\u1ee7 c\u1ee7a website, c\u00f2n email t\u00ecm \u0111\u00fang m\u00e1y ch\u1ee7 nh\u1eadn th\u01b0.<\/strong> M\u1ed7i l\u1ea7n b\u1ea1n m\u1edf m\u1ed9t trang web, thi\u1ebft b\u1ecb \u0111\u1ec1u h\u1ecfi DNS tr\u01b0\u1edbc r\u1ed3i m\u1edbi t\u1ea3i trang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/tino.vn\/blog\/ten-mien-la-gi\/\">T\u00ean mi\u1ec1n<\/a> l\u00e0 \u0111\u1ecba ch\u1ec9 d\u1ea1ng ch\u1eef c\u1ee7a website; DNS l\u00e0 ph\u1ea7n gi\u00fap \u0111\u1ecba ch\u1ec9 \u0111\u00f3 &#8220;ch\u1ea1y \u0111\u01b0\u1ee3c&#8221;. C\u00e1c m\u1ee5c d\u01b0\u1edbi \u0111\u00e2y tr\u1ea3 l\u1eddi l\u1ea7n l\u01b0\u1ee3t: DNS d\u00f9ng \u0111\u1ec3 l\u00e0m g\u00ec, m\u1ed9t truy v\u1ea5n \u0111i t\u1eeb m\u00e1y b\u1ea1n t\u1edbi m\u00e1y ch\u1ee7 DNS ra sao, c\u00e1c b\u1ea3n ghi hay g\u1eb7p v\u00e0 c\u00e1ch \u0111\u1ed5i DNS; m\u1ed7i lo\u1ea1i b\u1ea3n ghi c\u00f3 b\u00e0i ri\u00eang \u0111\u1ec3 \u0111\u1ecdc s\u00e2u h\u01a1n.<\/p>\n\n\n\n<h2 id=\"DNS_l\u00e0_g\u00ec?\">DNS l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DNS l\u00e0 h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e2n t\u00e1n, chia theo c\u00e2y t\u00ean mi\u1ec1n, d\u00f9ng \u0111\u1ec3 tra m\u1ed9t t\u00ean (nh\u01b0 www.tino.vn) ra th\u00f4ng tin g\u1eafn v\u1edbi t\u00ean \u0111\u00f3, th\u01b0\u1eddng l\u00e0 \u0111\u1ecba ch\u1ec9 IP. Kh\u00f4ng m\u00e1y ch\u1ee7 n\u00e0o gi\u1eef to\u00e0n b\u1ed9 d\u1eef li\u1ec7u: m\u1ed7i t\u00ean mi\u1ec1n t\u1ef1 qu\u1ea3n l\u00fd ph\u1ea7n c\u1ee7a m\u00ecnh, c\u00e1c t\u1ea7ng tr\u00ean ch\u1ec9 ch\u1ec9 \u0111\u01b0\u1eddng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed7i thi\u1ebft b\u1ecb v\u00e0 m\u00e1y ch\u1ee7 tr\u00ean Internet \u0111\u01b0\u1ee3c \u0111\u1ecbnh danh b\u1eb1ng <a href=\"https:\/\/tino.vn\/blog\/dia-chi-ip-la-gi\/\">\u0111\u1ecba ch\u1ec9 IP<\/a>, v\u00ed d\u1ee5 203.0.113.10 v\u1edbi IPv4 ho\u1eb7c m\u1ed9t d\u00e3y d\u00e0i h\u01a1n v\u1edbi IPv6. Con ng\u01b0\u1eddi kh\u00f3 nh\u1edb c\u00e1c d\u00e3y s\u1ed1 n\u00e0y, n\u00ean DNS ra \u0111\u1eddi \u0111\u1ec3 \u00e1nh x\u1ea1 t\u00ean sang s\u1ed1 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. DNS c\u0169ng \u0111\u01b0\u1ee3c v\u00ed nh\u01b0 &#8220;danh b\u1ea1 \u0111i\u1ec7n tho\u1ea1i c\u1ee7a Internet&#8221;.<\/p>\n\n\n\n<h3 id=\"DNS_ra_\u0111\u1eddi_khi_n\u00e0o?\">DNS ra \u0111\u1eddi khi n\u00e0o?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc DNS, m\u1ea1ng ARPANET d\u00f9ng m\u1ed9t t\u1ec7p HOSTS.TXT chung li\u1ec7t k\u00ea t\u00ean v\u00e0 \u0111\u1ecba ch\u1ec9 m\u1ecdi m\u00e1y; m\u1ea1ng l\u1edbn d\u1ea7n th\u00ec t\u1ec7p n\u00e0y kh\u00f4ng c\u00f2n theo k\u1ecbp. N\u0103m 1983, Paul Mockapetris c\u00f4ng b\u1ed1 thi\u1ebft k\u1ebf DNS trong RFC 882 v\u00e0 RFC 883. N\u0103m 1987, hai t\u00e0i li\u1ec7u n\u00e0y \u0111\u01b0\u1ee3c thay b\u1eb1ng <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc1034\" target=\"_blank\" rel=\"noopener nofollow\">RFC 1034<\/a> v\u00e0 <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc1035\" target=\"_blank\" rel=\"noopener nofollow\">RFC 1035<\/a>, v\u1eabn l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a DNS hi\u1ec7n nay c\u00f9ng nhi\u1ec1u RFC b\u1ed5 sung v\u1ec1 sau.<\/p>\n\n\n\n<h2 id=\"DNS_d\u00f9ng_\u0111\u1ec3_l\u00e0m_g\u00ec?\">DNS d\u00f9ng \u0111\u1ec3 l\u00e0m g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DNS d\u00f9ng \u0111\u1ec3 ch\u1ec9 cho m\u1ecdi d\u1ecbch v\u1ee5 Internet bi\u1ebft m\u1ed9t t\u00ean mi\u1ec1n n\u1eb1m \u1edf \u0111\u00e2u v\u00e0 d\u00f9ng th\u1ebf n\u00e0o: website \u1edf IP n\u00e0o, email g\u1eedi v\u1ec1 m\u00e1y ch\u1ee7 n\u00e0o, t\u00ean mi\u1ec1n \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh v\u1edbi d\u1ecbch v\u1ee5 n\u00e0o. Ch\u1ee7 t\u00ean mi\u1ec1n \u0111i\u1ec1u khi\u1ec3n c\u00e1c vi\u1ec7c n\u00e0y b\u1eb1ng b\u1ea3n ghi DNS, ng\u01b0\u1eddi truy c\u1eadp th\u00ec ch\u1ec9 c\u1ea7n nh\u1edb t\u00ean.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Truy c\u1eadp website:<\/strong> b\u1ea3n ghi A, AAAA tr\u1ecf t\u00ean mi\u1ec1n v\u1ec1 IP c\u1ee7a hosting ho\u1eb7c VPS.<\/li>\n\n\n<li><strong>Nh\u1eadn email theo t\u00ean mi\u1ec1n:<\/strong> b\u1ea3n ghi MX ch\u1ec9 m\u00e1y ch\u1ee7 nh\u1eadn th\u01b0; b\u1ea3n ghi TXT ch\u1ee9a SPF, DKIM, DMARC gi\u00fap th\u01b0 kh\u00f4ng b\u1ecb coi l\u00e0 gi\u1ea3 m\u1ea1o. V\u00ed d\u1ee5 c\u1ea5u h\u00ecnh \u0111\u1ee7 b\u1ed9 b\u1ea3n ghi email c\u00f3 \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/cau-hinh-email-ten-mien-rieng-tren-cloudflare\/\">c\u1ea5u h\u00ecnh email t\u00ean mi\u1ec1n ri\u00eang tr\u00ean Cloudflare<\/a>.<\/li>\n\n\n<li><strong>T\u1ea1o t\u00ean mi\u1ec1n con:<\/strong> <a href=\"https:\/\/tino.vn\/blog\/subdomain-la-gi\/\">subdomain<\/a> nh\u01b0 shop.tenban.vn, blog.tenban.vn ch\u1ec9 l\u00e0 th\u00eam b\u1ea3n ghi DNS, kh\u00f4ng ph\u1ea3i mua t\u00ean mi\u1ec1n m\u1edbi.<\/li>\n\n\n<li><strong>X\u00e1c minh quy\u1ec1n s\u1edf h\u1eefu:<\/strong> Google Search Console, Microsoft 365, Facebook y\u00eau c\u1ea7u th\u00eam m\u1ed9t b\u1ea3n ghi TXT, xem <a href=\"https:\/\/tino.vn\/blog\/xac-minh-quyen-so-huu-ten-mien-bang-dns\/\">c\u00e1ch x\u00e1c minh quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n b\u1eb1ng b\u1ea3n ghi DNS<\/a>.<\/li>\n\n\n<li><strong>\u0110\u1ed5i hosting m\u00e0 kh\u00f4ng \u0111\u1ed5i \u0111\u1ecba ch\u1ec9:<\/strong> chuy\u1ec3n website sang m\u00e1y ch\u1ee7 m\u1edbi ch\u1ec9 c\u1ea7n s\u1eeda b\u1ea3n ghi, kh\u00e1ch v\u1eabn g\u00f5 t\u00ean mi\u1ec1n c\u0169.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"DNS_ho\u1ea1t_\u0111\u1ed9ng_nh\u01b0_th\u1ebf_n\u00e0o?\">DNS ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Khi b\u1ea1n g\u00f5 m\u1ed9t t\u00ean mi\u1ec1n, thi\u1ebft b\u1ecb g\u1eedi c\u00e2u h\u1ecfi t\u1edbi m\u1ed9t DNS resolver. Resolver tr\u1ea3 l\u1eddi ngay n\u1ebfu \u0111\u00e3 c\u00f3 k\u1ebft qu\u1ea3 trong cache; n\u1ebfu ch\u01b0a, n\u00f3 l\u1ea7n l\u01b0\u1ee3t h\u1ecfi root server, m\u00e1y ch\u1ee7 c\u1ee7a \u0111u\u00f4i t\u00ean mi\u1ec1n (TLD) r\u1ed3i nameserver gi\u1eef b\u1ea3n ghi c\u1ee7a t\u00ean mi\u1ec1n, sau \u0111\u00f3 tr\u1ea3 IP v\u1ec1 cho thi\u1ebft b\u1ecb.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1400\" height=\"750\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-qua-trinh-phan-giai.webp\" alt=\"S\u01a1 \u0111\u1ed3 m\u1ed9t l\u1ea7n tra t\u00ean mi\u1ec1n: thi\u1ebft b\u1ecb h\u1ecfi www.tenban.vn t\u1edbi DNS resolver (nh\u01b0 1.1.1.1, 8.8.8.8); resolver h\u1ecfi l\u1ea7n l\u01b0\u1ee3t root, TLD .vn v\u00e0 nameserver authoritative \u0111\u1ec3 l\u1ea5y b\u1ea3n ghi A 203.0.113.10 r\u1ed3i tr\u1ea3 IP; k\u1ebft qu\u1ea3 gi\u1eef trong cache theo TTL\" class=\"wp-image-132621\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-qua-trinh-phan-giai.webp 1400w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-qua-trinh-phan-giai-300x161.webp 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-qua-trinh-phan-giai-1024x549.webp 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-qua-trinh-phan-giai-768x411.webp 768w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Thi\u1ebft b\u1ecb h\u1ecfi:<\/strong> tr\u00ecnh duy\u1ec7t v\u00e0 h\u1ec7 \u0111i\u1ec1u h\u00e0nh xem trong cache c\u1ee7a m\u00ecnh tr\u01b0\u1edbc; ch\u01b0a c\u00f3 th\u00ec g\u1eedi c\u00e2u h\u1ecfi t\u1edbi resolver \u0111\u00e3 c\u1ea5u h\u00ecnh (c\u1ee7a nh\u00e0 m\u1ea1ng, c\u00f4ng ty ho\u1eb7c DNS c\u00f4ng c\u1ed9ng).<\/li>\n\n\n<li><strong>Resolver h\u1ecfi root server:<\/strong> root kh\u00f4ng bi\u1ebft IP c\u1ee7a t\u00ean mi\u1ec1n, nh\u01b0ng bi\u1ebft m\u00e1y ch\u1ee7 n\u00e0o qu\u1ea3n l\u00fd \u0111u\u00f4i .vn, .com\u2026<\/li>\n\n\n<li><strong>Resolver h\u1ecfi TLD server:<\/strong> m\u00e1y ch\u1ee7 c\u1ee7a \u0111u\u00f4i t\u00ean mi\u1ec1n tr\u1ea3 v\u1ec1 danh s\u00e1ch nameserver (b\u1ea3n ghi NS) c\u1ee7a t\u00ean mi\u1ec1n.<\/li>\n\n\n<li><strong>Resolver h\u1ecfi nameserver c\u00f3 th\u1ea9m quy\u1ec1n:<\/strong> \u0111\u00e2y l\u00e0 n\u01a1i ch\u1ee7 t\u00ean mi\u1ec1n khai b\u00e1o b\u1ea3n ghi; n\u00f3 tr\u1ea3 v\u1ec1 b\u1ea3n ghi A ho\u1eb7c AAAA ch\u1ee9a IP.<\/li>\n\n\n<li><strong>Tr\u1ea3 k\u1ebft qu\u1ea3 v\u00e0 l\u01b0u cache:<\/strong> resolver g\u1eedi IP cho thi\u1ebft b\u1ecb v\u00e0 gi\u1eef k\u1ebft qu\u1ea3 trong th\u1eddi gian TTL c\u1ee7a b\u1ea3n ghi, n\u00ean l\u1ea7n sau tr\u1ea3 l\u1eddi nhanh h\u01a1n.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ec c\u00f3 cache, s\u1eeda b\u1ea3n ghi DNS kh\u00f4ng c\u00f3 hi\u1ec7u l\u1ef1c ngay \u1edf m\u1ecdi n\u01a1i: resolver n\u00e0o \u0111\u00e3 l\u01b0u k\u1ebft qu\u1ea3 c\u0169 s\u1ebd d\u00f9ng ti\u1ebfp \u0111\u1ebfn khi h\u1ebft TTL. Tr\u00ean m\u00e1y t\u00ednh, b\u1ea1n c\u00f3 th\u1ec3 xo\u00e1 cache c\u1ee5c b\u1ed9 b\u1eb1ng l\u1ec7nh <code>ipconfig \/flushdns<\/code>, xem <a href=\"https:\/\/tino.vn\/blog\/ipconfig-flushdns-la-gi\/\">ipconfig \/flushdns l\u00e0 g\u00ec<\/a>.<\/p>\n\n\n\n<h2 id=\"C\u00f3_nh\u1eefng_lo\u1ea1i_DNS_server_n\u00e0o?\">C\u00f3 nh\u1eefng lo\u1ea1i DNS server n\u00e0o?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t l\u1ea7n ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n c\u00f3 b\u1ed1n lo\u1ea1i DNS server tham gia: DNS resolver (m\u00e1y ch\u1ee7 \u0111\u1ec7 quy) l\u00e0m thay thi\u1ebft b\u1ecb to\u00e0n b\u1ed9 vi\u1ec7c t\u00ecm ki\u1ebfm, root server, TLD server v\u00e0 nameserver c\u00f3 th\u1ea9m quy\u1ec1n. Ba lo\u1ea1i sau ch\u1ec9 tr\u1ea3 l\u1eddi ph\u1ea7n d\u1eef li\u1ec7u m\u00ecnh qu\u1ea3n l\u00fd, kh\u00f4ng \u0111i h\u1ecfi h\u1ed9 ai.<\/p>\n\n\n\n<h3 id=\"DNS_resolver_(m\u00e1y_ch\u1ee7_ph\u00e2n_gi\u1ea3i_\u0111\u1ec7_quy)\">DNS resolver (m\u00e1y ch\u1ee7 ph\u00e2n gi\u1ea3i \u0111\u1ec7 quy)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DNS resolver l\u00e0 m\u00e1y ch\u1ee7 m\u00e0 \u0111i\u1ec7n tho\u1ea1i, m\u00e1y t\u00ednh g\u1eedi c\u00e2u h\u1ecfi t\u1edbi \u0111\u1ea7u ti\u00ean. N\u00f3 \u0111i h\u1ecfi c\u00e1c t\u1ea7ng c\u00f2n l\u1ea1i thay cho b\u1ea1n v\u00e0 l\u01b0u k\u1ebft qu\u1ea3 v\u00e0o cache. Resolver m\u1eb7c \u0111\u1ecbnh th\u01b0\u1eddng do nh\u00e0 m\u1ea1ng c\u1ea5p qua router; b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ed5i sang resolver c\u00f4ng c\u1ed9ng nh\u01b0 1.1.1.1 hay 8.8.8.8.<\/p>\n\n\n\n<h3 id=\"Root_server_(m\u00e1y_ch\u1ee7_g\u1ed1c)\">Root server (m\u00e1y ch\u1ee7 g\u1ed1c)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Root server tr\u1ea3 l\u1eddi \u1edf t\u1ea7ng tr\u00ean c\u00f9ng c\u1ee7a c\u00e2y t\u00ean mi\u1ec1n, ch\u1ec9 cho resolver bi\u1ebft m\u00e1y ch\u1ee7 n\u00e0o qu\u1ea3n l\u00fd t\u1eebng \u0111u\u00f4i. Theo <a href=\"https:\/\/www.iana.org\/domains\/root\/servers\" target=\"_blank\" rel=\"noopener nofollow\">IANA<\/a>, root \u0111\u01b0\u1ee3c khai b\u00e1o th\u00e0nh 13 &#8220;named authorities&#8221; t\u1eeb a.root-servers.net \u0111\u1ebfn m.root-servers.net, do 12 t\u1ed5 ch\u1ee9c v\u1eadn h\u00e0nh, nh\u01b0ng th\u1ef1c t\u1ebf l\u00e0 m\u1ed9t m\u1ea1ng h\u00e0ng tr\u0103m m\u00e1y ch\u1ee7 \u0111\u1eb7t \u1edf nhi\u1ec1u qu\u1ed1c gia.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1350\" height=\"956\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-13-may-chu-goc-iana.webp\" alt=\"\u1ea2nh ch\u1ee5p trang Root Name Servers c\u1ee7a IANA ng\u00e0y 27\/10\/2026: danh s\u00e1ch 13 t\u00ean t\u1eeb a.root-servers.net \u0111\u1ebfn m.root-servers.net k\u00e8m \u0111\u1ecba ch\u1ec9 IP v\u00e0 \u0111\u01a1n v\u1ecb v\u1eadn h\u00e0nh nh\u01b0 Verisign, ICANN, RIPE NCC; khoanh \u0111\u1ecf a.root-servers.net\" class=\"wp-image-132619\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-13-may-chu-goc-iana.webp 1350w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-13-may-chu-goc-iana-300x212.webp 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-13-may-chu-goc-iana-1024x725.webp 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-13-may-chu-goc-iana-768x544.webp 768w\" sizes=\"(max-width: 1350px) 100vw, 1350px\" \/><figcaption class=\"wp-element-caption\">\u1ea2nh ch\u1ee5p trang <a href=\"https:\/\/www.iana.org\/domains\/root\/servers\" target=\"_blank\" rel=\"noopener nofollow\">Root Name Servers c\u1ee7a IANA<\/a> ng\u00e0y 27\/10\/2026.<\/figcaption><\/figure>\n\n\n\n<h3 id=\"TLD_server_(m\u00e1y_ch\u1ee7_c\u1ee7a_\u0111u\u00f4i_t\u00ean_mi\u1ec1n)\">TLD server (m\u00e1y ch\u1ee7 c\u1ee7a \u0111u\u00f4i t\u00ean mi\u1ec1n)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">TLD server qu\u1ea3n l\u00fd m\u1ed9t \u0111u\u00f4i nh\u01b0 .com, .net hay .vn v\u00e0 gi\u1eef b\u1ea3n ghi NS c\u1ee7a m\u1ecdi t\u00ean mi\u1ec1n thu\u1ed9c \u0111u\u00f4i \u0111\u00f3. \u0110u\u00f4i .vn do VNNIC (Trung t\u00e2m Internet Vi\u1ec7t Nam) qu\u1ea3n l\u00fd; c\u00e1c lo\u1ea1i \u0111u\u00f4i \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/gtlds-la-gi\/\">c\u00e1c lo\u1ea1i \u0111u\u00f4i t\u00ean mi\u1ec1n (TLD, gTLD)<\/a>.<\/p>\n\n\n\n<h3 id=\"Nameserver_c\u00f3_th\u1ea9m_quy\u1ec1n_(authoritative)\">Nameserver c\u00f3 th\u1ea9m quy\u1ec1n (authoritative)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nameserver c\u00f3 th\u1ea9m quy\u1ec1n l\u00e0 n\u01a1i l\u01b0u zone c\u1ee7a t\u00ean mi\u1ec1n, t\u1ee9c to\u00e0n b\u1ed9 b\u1ea3n ghi A, CNAME, MX, TXT do ch\u1ee7 t\u00ean mi\u1ec1n khai b\u00e1o, v\u00e0 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi cu\u1ed1i c\u00f9ng. Nameserver c\u00f3 th\u1ec3 c\u1ee7a nh\u00e0 \u0111\u0103ng k\u00fd, c\u1ee7a hosting ho\u1eb7c c\u1ee7a Cloudflare; c\u00e1ch ch\u1ecdn v\u00e0 c\u00e1ch \u0111\u1ed5i c\u00f3 \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/name-servers-la-gi\/\">name server l\u00e0 g\u00ec<\/a>.<\/p>\n\n\n\n<h2 id=\"C\u00e1c_b\u1ea3n_ghi_DNS_th\u01b0\u1eddng_g\u1eb7p\">C\u00e1c b\u1ea3n ghi DNS th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea3n ghi DNS (DNS record) l\u00e0 t\u1eebng d\u00f2ng d\u1eef li\u1ec7u trong zone c\u1ee7a t\u00ean mi\u1ec1n, g\u1ed3m t\u00ean, lo\u1ea1i b\u1ea3n ghi, TTL v\u00e0 gi\u00e1 tr\u1ecb. Website th\u01b0\u1eddng ch\u1ec9 c\u1ea7n b\u1ea3n ghi A ho\u1eb7c CNAME; email c\u1ea7n th\u00eam MX v\u00e0 TXT. B\u1ea3ng d\u01b0\u1edbi li\u1ec7t k\u00ea c\u00e1c lo\u1ea1i hay g\u1eb7p v\u00e0 b\u00e0i gi\u1ea3i th\u00edch chi ti\u1ebft.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>B\u1ea3n ghi<\/th><th>D\u00f9ng \u0111\u1ec3<\/th><th>V\u00ed d\u1ee5 gi\u00e1 tr\u1ecb<\/th><th>\u0110\u1ecdc th\u00eam<\/th><\/tr><\/thead><tbody><tr><td>A<\/td><td>Tr\u1ecf t\u00ean v\u1ec1 \u0111\u1ecba ch\u1ec9 IPv4<\/td><td>203.0.113.10<\/td><td>\u2013<\/td><\/tr><tr><td>AAAA<\/td><td>Tr\u1ecf t\u00ean v\u1ec1 \u0111\u1ecba ch\u1ec9 IPv6 (RFC 3596)<\/td><td>2001:db8::10<\/td><td><a href=\"https:\/\/tino.vn\/blog\/ipv6-address-la-gi\/\">IPv6 l\u00e0 g\u00ec<\/a><\/td><\/tr><tr><td>CNAME<\/td><td>\u0110\u1eb7t b\u00ed danh: t\u00ean n\u00e0y d\u00f9ng chung d\u1eef li\u1ec7u v\u1edbi m\u1ed9t t\u00ean kh\u00e1c<\/td><td>tenban.vn.<\/td><td><a href=\"https:\/\/tino.vn\/blog\/cname-la-gi\/\">CNAME l\u00e0 g\u00ec<\/a><\/td><\/tr><tr><td>MX<\/td><td>Ch\u1ec9 m\u00e1y ch\u1ee7 nh\u1eadn email, k\u00e8m \u0111\u1ed9 \u01b0u ti\u00ean<\/td><td>10 mx.tenban.vn.<\/td><td><a href=\"https:\/\/tino.vn\/blog\/cau-hinh-email-ten-mien-rieng-tren-cloudflare\/\">b\u1ea3n ghi email tr\u00ean Cloudflare<\/a><\/td><\/tr><tr><td>TXT<\/td><td>Ghi chu\u1ed7i v\u0103n b\u1ea3n: SPF, DKIM, DMARC, m\u00e3 x\u00e1c minh<\/td><td>v=spf1 include:\u2026 ~all<\/td><td><a href=\"https:\/\/tino.vn\/blog\/xac-minh-quyen-so-huu-ten-mien-bang-dns\/\">x\u00e1c minh b\u1eb1ng TXT<\/a><\/td><\/tr><tr><td>NS<\/td><td>Khai b\u00e1o nameserver qu\u1ea3n l\u00fd t\u00ean mi\u1ec1n<\/td><td>ns1.example.net.<\/td><td><a href=\"https:\/\/tino.vn\/blog\/name-servers-la-gi\/\">name server l\u00e0 g\u00ec<\/a><\/td><\/tr><tr><td>SOA<\/td><td>Th\u00f4ng tin qu\u1ea3n tr\u1ecb c\u1ee7a zone: m\u00e1y ch\u1ee7 ch\u00ednh, s\u1ed1 serial, b\u1ed9 \u0111\u1ebfm \u0111\u1ed3ng b\u1ed9<\/td><td>ns1\u2026 admin\u2026 2026102701 \u2026<\/td><td><a href=\"https:\/\/tino.vn\/blog\/dns-soa-la-gi\/\">b\u1ea3n ghi SOA<\/a><\/td><\/tr><tr><td>PTR<\/td><td>Tra ng\u01b0\u1ee3c t\u1eeb IP ra t\u00ean, hay d\u00f9ng cho m\u00e1y ch\u1ee7 g\u1eedi email<\/td><td>mail.tenban.vn.<\/td><td><a href=\"https:\/\/tino.vn\/blog\/ptr-record-la-gi\/\">PTR record l\u00e0 g\u00ec<\/a><\/td><\/tr><tr><td>SRV<\/td><td>Ch\u1ec9 m\u00e1y ch\u1ee7 v\u00e0 c\u1ed5ng c\u1ee7a m\u1ed9t d\u1ecbch v\u1ee5 (VoIP, chat\u2026)<\/td><td>10 5 5060 sip.tenban.vn.<\/td><td>\u2013<\/td><\/tr><tr><td>CAA<\/td><td>Gi\u1edbi h\u1ea1n t\u1ed5 ch\u1ee9c n\u00e0o \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng ch\u1ec9 SSL cho t\u00ean mi\u1ec1n<\/td><td>0 issue &#8220;letsencrypt.org&#8221;<\/td><td><a href=\"https:\/\/tino.vn\/blog\/ssl-certificate-la-gi\/\">ch\u1ee9ng ch\u1ec9 SSL l\u00e0 g\u00ec<\/a><\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">tenban.vn l\u00e0 t\u00ean minh ho\u1ea1; example.net v\u00e0 c\u00e1c IP v\u00ed d\u1ee5 thu\u1ed9c nh\u00f3m d\u00e0nh cho t\u00e0i li\u1ec7u (RFC 2606, RFC 5737, RFC 3849).<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trong b\u1ea3n ghi DNS, t\u00ean th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft \u0111\u1ea7y \u0111\u1ee7 t\u1edbi d\u1ea5u ch\u1ea5m cu\u1ed1i, g\u1ecdi l\u00e0 FQDN; thi\u1ebfu d\u1ea5u ch\u1ea5m trong file zone l\u00e0 l\u1ed7i hay g\u1eb7p, xem <a href=\"https:\/\/tino.vn\/blog\/fqdn-la-gi\/\">FQDN l\u00e0 g\u00ec<\/a>. Mu\u1ed1n ch\u1eafc d\u1eef li\u1ec7u DNS kh\u00f4ng b\u1ecb gi\u1ea3 m\u1ea1o tr\u00ean \u0111\u01b0\u1eddng \u0111i, t\u00ean mi\u1ec1n c\u1ea7n k\u00fd b\u1eb1ng <a href=\"https:\/\/tino.vn\/blog\/dnssec-la-gi\/\">DNSSEC<\/a>.<\/p>\n\n\n\n<h2 id=\"C\u1ea5u_h\u00ecnh_DNS_l\u00e0_g\u00ec?_Hai_vi\u1ec7c_hay_b\u1ecb_nh\u1ea7m\">C\u1ea5u h\u00ecnh DNS l\u00e0 g\u00ec? Hai vi\u1ec7c hay b\u1ecb nh\u1ea7m<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;C\u1ea5u h\u00ecnh DNS&#8221; hay &#8220;\u0111\u1ed5i DNS&#8221; c\u00f3 th\u1ec3 l\u00e0 hai vi\u1ec7c kh\u00e1c nhau: \u0111\u1ed5i DNS resolver tr\u00ean m\u00e1y c\u1ee7a b\u1ea1n, ho\u1eb7c s\u1eeda b\u1ea3n ghi DNS c\u1ee7a t\u00ean mi\u1ec1n. Vi\u1ec7c th\u1ee9 nh\u1ea5t ch\u1ec9 \u1ea3nh h\u01b0\u1edfng thi\u1ebft b\u1ecb \u0111ang d\u00f9ng; vi\u1ec7c th\u1ee9 hai thay \u0111\u1ed5i c\u00e1ch c\u1ea3 Internet t\u00ecm t\u1edbi website v\u00e0 email c\u1ee7a t\u00ean mi\u1ec1n.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1400\" height=\"750\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-hai-kieu-cau-hinh.webp\" alt=\"B\u1ea3ng so s\u00e1nh hai ki\u1ec3u &quot;\u0111\u1ed5i DNS&quot;: ng\u01b0\u1eddi truy c\u1eadp \u0111\u1ed5i DNS resolver tr\u00ean m\u00e1y, router (gi\u00e1 tr\u1ecb nh\u01b0 1.1.1.1, ch\u1ec9 \u1ea3nh h\u01b0\u1edfng thi\u1ebft b\u1ecb \u0111\u00f3); ch\u1ee7 t\u00ean mi\u1ec1n s\u1eeda b\u1ea3n ghi DNS t\u1ea1i nameserver (A, CNAME, MX, \u1ea3nh h\u01b0\u1edfng m\u1ecdi ng\u01b0\u1eddi d\u00f9ng)\" class=\"wp-image-132620\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-hai-kieu-cau-hinh.webp 1400w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-hai-kieu-cau-hinh-300x161.webp 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-hai-kieu-cau-hinh-1024x549.webp 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/dns-la-gi-hai-kieu-cau-hinh-768x411.webp 768w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu b\u1ea1n v\u1eeba mua t\u00ean mi\u1ec1n v\u00e0 hosting, vi\u1ec7c c\u1ea7n l\u00e0m l\u00e0 vi\u1ec7c th\u1ee9 hai: tr\u1ecf nameserver ho\u1eb7c b\u1ea3n ghi A v\u1ec1 hosting. Quan h\u1ec7 gi\u1eefa hai d\u1ecbch v\u1ee5 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/hosting-va-domain\/\">ph\u00e2n bi\u1ec7t hosting v\u00e0 t\u00ean mi\u1ec1n<\/a>; th\u00eam t\u00ean mi\u1ec1n v\u00e0o hosting cPanel c\u00f3 \u1edf <a href=\"https:\/\/tino.vn\/blog\/cach-them-ten-mien-moi-vao-hosting-cpanel\/\">c\u00e1ch th\u00eam t\u00ean mi\u1ec1n m\u1edbi v\u00e0o hosting cPanel<\/a>; t\u1ea1o t\u00ean mi\u1ec1n con c\u00f3 \u1edf <a href=\"https:\/\/tino.vn\/blog\/cach-tao-subdomain\/\">c\u00e1ch t\u1ea1o subdomain tr\u00ean cPanel<\/a>.<\/p>\n\n\n\n<h2 id=\"C\u00e1ch_\u0111\u1ed5i_DNS_server_tr\u00ean_m\u00e1y_t\u00ednh_Windows\">C\u00e1ch \u0111\u1ed5i DNS server tr\u00ean m\u00e1y t\u00ednh Windows<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed5i DNS server tr\u00ean Windows l\u00e0 khai b\u00e1o \u0111\u1ecba ch\u1ec9 resolver kh\u00e1c cho card m\u1ea1ng \u0111ang d\u00f9ng, trong m\u1ee5c thu\u1ed9c t\u00ednh IPv4. Vi\u1ec7c n\u00e0y h\u1eefu \u00edch khi resolver c\u1ee7a nh\u00e0 m\u1ea1ng ch\u1eadm ho\u1eb7c l\u1ed7i; n\u00f3 kh\u00f4ng l\u00e0m website nhanh h\u01a1n v\u00e0 kh\u00f4ng thay \u0111\u1ed5i b\u1ea3n ghi c\u1ee7a t\u00ean mi\u1ec1n n\u00e0o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c b\u01b0\u1edbc d\u01b0\u1edbi \u0111\u00e2y l\u00e0m tr\u00ean Control Panel, v\u1eabn c\u00f3 trong Windows 10 v\u00e0 Windows 11 (\u1ea3nh ch\u1ee5p tr\u00ean Windows 10).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 1:<\/strong> M\u1edf <strong>Control Panel<\/strong>, ch\u1ecdn <strong>Network and Sharing Center<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"375\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-8.png\" alt=\"\u1ea2nh ch\u1ee5p Control Panel tr\u00ean Windows, khoanh \u0111\u1ecf m\u1ee5c Network and Sharing Center\" class=\"wp-image-101725\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-8.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-8-300x161.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 2:<\/strong> \u1ede c\u1ed9t b\u00ean tr\u00e1i, ch\u1ecdn <strong>Change adapter settings<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"375\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-9.png\" alt=\"\u1ea2nh ch\u1ee5p Network and Sharing Center, khoanh \u0111\u1ecf li\u00ean k\u1ebft Change adapter settings \u1edf c\u1ed9t tr\u00e1i\" class=\"wp-image-101726\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-9.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-9-300x161.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 3:<\/strong> Nh\u1ea5n chu\u1ed9t ph\u1ea3i v\u00e0o k\u1ebft n\u1ed1i \u0111ang d\u00f9ng (Wi-Fi ho\u1eb7c Ethernet), ch\u1ecdn <strong>Properties<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"375\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-10.png\" alt=\"\u1ea2nh ch\u1ee5p menu chu\u1ed9t ph\u1ea3i tr\u00ean k\u1ebft n\u1ed1i Wi-Fi, khoanh \u0111\u1ecf m\u1ee5c Properties\" class=\"wp-image-101727\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-10.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-10-300x161.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 4:<\/strong> Ch\u1ecdn <strong>Internet Protocol Version 4 (TCP\/IPv4)<\/strong>, nh\u1ea5n <strong>Properties<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"375\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-11.png\" alt=\"\u1ea2nh ch\u1ee5p c\u1eeda s\u1ed5 Wi-Fi Properties, khoanh \u0111\u1ecf d\u00f2ng Internet Protocol Version 4 (TCP\/IPv4) v\u00e0 n\u00fat Properties\" class=\"wp-image-101728\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-11.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-11-300x161.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 5:<\/strong> Ch\u1ecdn <strong>Use the following DNS server addresses<\/strong>, nh\u1eadp \u0111\u1ecba ch\u1ec9 \u1edf \u00f4 Preferred v\u00e0 Alternate (v\u00ed d\u1ee5 8.8.8.8 v\u00e0 8.8.4.4), nh\u1ea5n <strong>OK<\/strong>. Mu\u1ed1n quay v\u1ec1 m\u1eb7c \u0111\u1ecbnh th\u00ec ch\u1ecdn l\u1ea1i <strong>Obtain DNS server address automatically<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"375\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-12.png\" alt=\"\u1ea2nh ch\u1ee5p h\u1ed9p tho\u1ea1i thu\u1ed9c t\u00ednh IPv4, khoanh \u0111\u1ecf \u00f4 Preferred DNS server 8.8.8.8 v\u00e0 Alternate DNS server 8.8.4.4\" class=\"wp-image-101729\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-12.png 700w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2023\/07\/dns-la-gi-12-300x161.png 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean Windows 11 c\u00f2n c\u00f3 \u0111\u01b0\u1eddng kh\u00e1c: <strong>Settings \u2192 Network &amp; internet \u2192 Wi-Fi ho\u1eb7c Ethernet \u2192 Hardware properties \u2192 DNS server assignment \u2192 Edit<\/strong>.<\/p>\n\n\n\n<h3 id=\"\u0110\u1ecba_ch\u1ec9_DNS_c\u00f4ng_c\u1ed9ng_hay_d\u00f9ng\">\u0110\u1ecba ch\u1ec9 DNS c\u00f4ng c\u1ed9ng hay d\u00f9ng<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>D\u1ecbch v\u1ee5<\/th><th>IPv4<\/th><th>IPv6<\/th><th>Ghi ch\u00fa<\/th><\/tr><\/thead><tbody><tr><td>Cloudflare 1.1.1.1<\/td><td>1.1.1.1, 1.0.0.1<\/td><td>2606:4700:4700::1111, 2606:4700:4700::1001<\/td><td>B\u1ea3n l\u1ecdc m\u00e3 \u0111\u1ed9c: 1.1.1.2, 1.0.0.2<\/td><\/tr><tr><td>Google Public DNS<\/td><td>8.8.8.8, 8.8.4.4<\/td><td>2001:4860:4860::8888, 2001:4860:4860::8844<\/td><td>\u2013<\/td><\/tr><tr><td>Quad9<\/td><td>9.9.9.9, 149.112.112.112<\/td><td>\u2013<\/td><td>Ch\u1eb7n t\u00ean mi\u1ec1n \u0111\u1ed9c h\u1ea1i, ki\u1ec3m DNSSEC<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Theo trang ch\u00ednh th\u1ee9c c\u1ee7a <a href=\"https:\/\/developers.cloudflare.com\/1.1.1.1\/ip-addresses\/\" target=\"_blank\" rel=\"noopener nofollow\">Cloudflare<\/a>, <a href=\"https:\/\/developers.google.com\/speed\/public-dns\/docs\/using\" target=\"_blank\" rel=\"noopener nofollow\">Google<\/a> v\u00e0 <a href=\"https:\/\/quad9.net\/service\/service-addresses-and-features\/\" target=\"_blank\" rel=\"noopener nofollow\">Quad9<\/a>, truy c\u1eadp 27\/10\/2026.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">DNS do nh\u00e0 m\u1ea1ng c\u1ea5p qua router th\u01b0\u1eddng \u0111\u00e3 \u0111\u1ee7 d\u00f9ng. \u0110\u1ecba ch\u1ec9 resolver c\u1ee7a t\u1eebng nh\u00e0 m\u1ea1ng c\u00f3 th\u1ec3 kh\u00e1c theo khu v\u1ef1c, n\u00ean n\u1ebfu c\u1ea7n h\u00e3y l\u1ea5y t\u1eeb ch\u00ednh nh\u00e0 m\u1ea1ng thay v\u00ec ch\u00e9p t\u1eeb b\u00e0i vi\u1ebft.<\/p>\n\n\n\n<h2 id=\"L\u1ed7i_DNS_th\u01b0\u1eddng_g\u1eb7p_v\u00e0_c\u00e1ch_x\u1eed_l\u00fd\">L\u1ed7i DNS th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch x\u1eed l\u00fd<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ed7i DNS x\u1ea3y ra khi thi\u1ebft b\u1ecb kh\u00f4ng h\u1ecfi \u0111\u01b0\u1ee3c resolver, ho\u1eb7c resolver tr\u1ea3 l\u1eddi r\u1eb1ng t\u00ean kh\u00f4ng t\u1ed3n t\u1ea1i hay kh\u00f4ng tr\u1ea3 l\u1eddi \u0111\u01b0\u1ee3c. C\u1ea7n t\u00e1ch hai tr\u01b0\u1eddng h\u1ee3p: ch\u1ec9 m\u00e1y b\u1ea1n l\u1ed7i (th\u01b0\u1eddng do m\u1ea1ng, resolver, cache) hay m\u1ecdi ng\u01b0\u1eddi \u0111\u1ec1u l\u1ed7i (th\u01b0\u1eddng do t\u00ean mi\u1ec1n h\u1ebft h\u1ea1n ho\u1eb7c b\u1ea3n ghi sai).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DNS_PROBE_FINISHED_NXDOMAIN:<\/strong> resolver tr\u1ea3 l\u1eddi &#8220;t\u00ean kh\u00f4ng t\u1ed3n t\u1ea1i&#8221;. Ki\u1ec3m tra g\u00f5 \u0111\u00fang t\u00ean ch\u01b0a, t\u00ean mi\u1ec1n c\u00f2n h\u1ea1n kh\u00f4ng, b\u1ea3n ghi \u0111\u00e3 t\u1ea1o ch\u01b0a. C\u00e1ch x\u1eed l\u00fd tr\u00ean \u0111i\u1ec7n tho\u1ea1i c\u00f3 \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/cach-sua-loi-dns-probe-finished-nxdomain-tren-dien-thoai\/\">s\u1eeda l\u1ed7i DNS_PROBE_FINISHED_NXDOMAIN tr\u00ean \u0111i\u1ec7n tho\u1ea1i<\/a>.<\/li>\n\n\n<li><strong>DNS server not responding:<\/strong> thi\u1ebft b\u1ecb kh\u00f4ng li\u00ean l\u1ea1c \u0111\u01b0\u1ee3c resolver. Kh\u1edfi \u0111\u1ed9ng l\u1ea1i router, th\u1eed resolver kh\u00e1c, ki\u1ec3m tra ph\u1ea7n m\u1ec1m VPN ho\u1eb7c t\u01b0\u1eddng l\u1eeda.<\/li>\n\n\n<li><strong>Website \u0111\u00e3 chuy\u1ec3n hosting nh\u01b0ng m\u00e1y b\u1ea1n v\u1eabn v\u00e0o ch\u1ed7 c\u0169:<\/strong> cache c\u00f2n k\u1ebft qu\u1ea3 c\u0169. Xo\u00e1 cache b\u1eb1ng <code>ipconfig \/flushdns<\/code> v\u00e0 ch\u1edd h\u1ebft TTL \u1edf resolver.<\/li>\n\n\n<li><strong>Ch\u1ec9 m\u1ed9t v\u00e0i website kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c:<\/strong> ki\u1ec3m tra t\u1ec7p hosts (C:\\Windows\\System32\\drivers\\etc\\hosts) v\u00e0 ph\u1ea7n m\u1ec1m l\u1ecdc n\u1ed9i dung.<\/li>\n\n\n<li><strong>DNS hijacking (b\u1ecb \u0111\u1ed5i DNS tr\u00e1i ph\u00e9p):<\/strong> router ho\u1eb7c m\u00e1y nhi\u1ec5m m\u00e3 \u0111\u1ed9c t\u1ef1 \u0111\u1ed5i resolver \u0111\u1ec3 d\u1eabn b\u1ea1n t\u1edbi trang gi\u1ea3. \u0110\u1ed5i m\u1eadt kh\u1ea9u qu\u1ea3n tr\u1ecb router, c\u1eadp nh\u1eadt firmware, qu\u00e9t m\u00e3 \u0111\u1ed9c.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ean mi\u1ec1n d\u00f9ng IP \u0111\u1ed9ng \u1edf nh\u00e0 (camera, NAS) c\u1ea7n d\u1ecbch v\u1ee5 <a href=\"https:\/\/tino.vn\/blog\/ddns-la-gi\/\">DDNS<\/a> \u0111\u1ec3 b\u1ea3n ghi t\u1ef1 c\u1eadp nh\u1eadt theo IP m\u1edbi.<\/p>\n\n\n\n<h2 id=\"B\u1ea3o_m\u1eadt_DNS:_DNSSEC,_DoH_v\u00e0_DoT\">B\u1ea3o m\u1eadt DNS: DNSSEC, DoH v\u00e0 DoT<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DNS g\u1ed1c g\u1eedi truy v\u1ea5n kh\u00f4ng m\u00e3 ho\u00e1 v\u00e0 kh\u00f4ng c\u00f3 ch\u1eef k\u00fd, n\u00ean c\u00f3 hai h\u01b0\u1edbng b\u1ea3o v\u1ec7 ri\u00eang: DNSSEC ch\u1ee9ng minh c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang l\u00e0 c\u1ee7a ch\u1ee7 t\u00ean mi\u1ec1n v\u00e0 kh\u00f4ng b\u1ecb s\u1eeda, c\u00f2n DoH v\u00e0 DoT m\u00e3 ho\u00e1 \u0111\u01b0\u1eddng truy\u1ec1n gi\u1eefa thi\u1ebft b\u1ecb v\u00e0 resolver \u0111\u1ec3 ng\u01b0\u1eddi \u1edf gi\u1eefa kh\u00f4ng \u0111\u1ecdc \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DNSSEC<\/strong> (<a href=\"https:\/\/www.icann.org\/resources\/pages\/dnssec-what-is-it-why-important-2019-03-05-en\" target=\"_blank\" rel=\"noopener nofollow\">ICANN<\/a>): th\u00eam ch\u1eef k\u00fd s\u1ed1 v\u00e0o d\u1eef li\u1ec7u DNS; root zone \u0111\u01b0\u1ee3c k\u00fd t\u1eeb n\u0103m 2010. DNSSEC kh\u00f4ng m\u00e3 ho\u00e1 truy v\u1ea5n. Chi ti\u1ebft \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/dnssec-la-gi\/\">DNSSEC l\u00e0 g\u00ec<\/a>.<\/li>\n\n\n<li><strong>DNS over HTTPS (DoH, <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc8484\" target=\"_blank\" rel=\"noopener nofollow\">RFC 8484<\/a>):<\/strong> g\u1eedi truy v\u1ea5n DNS trong k\u1ebft n\u1ed1i HTTPS, c\u1ed5ng 443. Chrome, Firefox, Edge c\u00f3 tu\u1ef3 ch\u1ecdn b\u1eadt &#8220;DNS b\u1ea3o m\u1eadt&#8221;.<\/li>\n\n\n<li><strong>DNS over TLS (DoT, <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc7858\" target=\"_blank\" rel=\"noopener nofollow\">RFC 7858<\/a>):<\/strong> g\u1eedi truy v\u1ea5n qua TLS \u1edf c\u1ed5ng ri\u00eang 853. Android d\u00f9ng c\u00e1ch n\u00e0y cho t\u00ednh n\u0103ng DNS ri\u00eang t\u01b0 (Private DNS).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i l\u1edbp DNS, nhi\u1ec1u t\u00ean mi\u1ec1n \u0111\u1eb7t nameserver sau d\u1ecbch v\u1ee5 nh\u01b0 <a href=\"https:\/\/tino.vn\/blog\/cloudflare-la-gi\/\">Cloudflare<\/a> \u0111\u1ec3 ch\u1ed1ng t\u1ea5n c\u00f4ng t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5; lo\u1ea1i t\u1ea5n c\u00f4ng n\u00e0y \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/ddos-la-gi\/\">DDoS l\u00e0 g\u00ec<\/a>.<\/p>\n\n\n\n<h2 id=\"Khi_n\u00e0o_kh\u00f4ng_n\u00ean_t\u1ef1_\u0111\u1ed5i_DNS?\">Khi n\u00e0o kh\u00f4ng n\u00ean t\u1ef1 \u0111\u1ed5i DNS?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng n\u00ean t\u1ef1 \u0111\u1ed5i DNS khi b\u1ea1n ch\u01b0a bi\u1ebft nameserver n\u00e0o \u0111ang gi\u1eef b\u1ea3n ghi c\u1ee7a t\u00ean mi\u1ec1n, ho\u1eb7c khi t\u00ean mi\u1ec1n \u0111ang ch\u1ea1y email v\u00e0 d\u1ecbch v\u1ee5 kh\u00e1c. \u0110\u1ed5i nameserver hay xo\u00e1 b\u1ea3n ghi sai c\u00f3 th\u1ec3 l\u00e0m website v\u00e0 email d\u1eebng trong nhi\u1ec1u gi\u1edd, v\u00ec k\u1ebft qu\u1ea3 c\u0169 c\u00f2n n\u1eb1m trong cache c\u1ee7a resolver.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tr\u01b0\u1edbc khi \u0111\u1ed5i nameserver, ch\u00e9p \u0111\u1ee7 b\u1ea3n ghi \u0111ang d\u00f9ng (A, CNAME, MX, TXT) sang n\u01a1i m\u1edbi.<\/li>\n\n\n<li>Mu\u1ed1n chuy\u1ec3n hosting \u00eam, h\u1ea1 TTL c\u1ee7a b\u1ea3n ghi A xu\u1ed1ng th\u1ea5p (v\u00ed d\u1ee5 300 gi\u00e2y) tr\u01b0\u1edbc m\u1ed9t ng\u00e0y, sau khi chuy\u1ec3n xong m\u1edbi t\u0103ng l\u1ea1i.<\/li>\n\n\n<li>\u0110\u1ed5i DNS resolver tr\u00ean m\u00e1y ch\u1ec9 \u0111\u1ed5i n\u01a1i m\u00e1y b\u1ea1n h\u1ecfi t\u00ean mi\u1ec1n: n\u00f3 kh\u00f4ng l\u00e0m website c\u1ee7a b\u1ea1n nhanh h\u01a1n v\u1edbi ng\u01b0\u1eddi kh\u00e1c, v\u00e0 kh\u00f4ng d\u00f9ng \u0111\u1ec3 truy c\u1eadp trang b\u1ecb ch\u1eb7n theo quy \u0111\u1ecbnh.<\/li>\n\n\n<li>B\u1ea3n ghi TXT x\u00e1c minh (Google, Microsoft) ph\u1ea3i gi\u1eef l\u1ea1i sau khi x\u00e1c minh; xo\u00e1 \u0111i th\u00ec d\u1ecbch v\u1ee5 c\u00f3 th\u1ec3 m\u1ea5t quy\u1ec1n s\u1edf h\u1eefu \u0111\u00e3 x\u00e1c minh.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"M\u1ee5c_l\u1ee5c_c\u1ee5m_DNS_v\u00e0_b\u1ea3n_ghi\">M\u1ee5c l\u1ee5c c\u1ee5m DNS v\u00e0 b\u1ea3n ghi<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C\u1ee5m DNS v\u00e0 b\u1ea3n ghi tr\u00ean Blog Tino g\u1ed3m c\u00e1c b\u00e0i kh\u00e1i ni\u1ec7m, c\u00e1c b\u00e0i v\u1ec1 t\u1eebng lo\u1ea1i b\u1ea3n ghi v\u00e0 c\u00e1c b\u00e0i h\u01b0\u1edbng d\u1eabn, s\u1eeda l\u1ed7i. B\u00e0i n\u00e0o c\u0169ng d\u1eabn ng\u01b0\u1ee3c v\u1ec1 \u0111\u00e2y v\u00e0 v\u1ec1 trang t\u1ed5ng quan <a href=\"https:\/\/tino.vn\/blog\/ten-mien-la-gi\/\">t\u00ean mi\u1ec1n l\u00e0 g\u00ec<\/a>; ch\u1ecdn theo vi\u1ec7c b\u1ea1n \u0111ang c\u1ea7n l\u00e0m.<\/p>\n\n\n\n<h3 id=\"Kh\u00e1i_ni\u1ec7m_v\u00e0_b\u1ea3n_ghi\">Kh\u00e1i ni\u1ec7m v\u00e0 b\u1ea3n ghi<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/tino.vn\/blog\/name-servers-la-gi\/\">Name server l\u00e0 g\u00ec? C\u00e1ch tr\u1ecf t\u00ean mi\u1ec1n b\u1eb1ng nameserver<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/cname-la-gi\/\">CNAME l\u00e0 g\u00ec? Khi n\u00e0o d\u00f9ng b\u1ea3n ghi CNAME thay b\u1ea3n ghi A<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/dns-soa-la-gi\/\">B\u1ea3n ghi SOA l\u00e0 g\u00ec? \u00dd ngh\u0129a c\u00e1c tr\u01b0\u1eddng serial, refresh, expire<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/ptr-record-la-gi\/\">PTR record l\u00e0 g\u00ec? C\u00e1ch ki\u1ec3m tra reverse DNS<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/dnssec-la-gi\/\">DNSSEC l\u00e0 g\u00ec? Chu\u1ed7i tin c\u1eady v\u00e0 c\u00e1ch b\u1eadt<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/fqdn-la-gi\/\">FQDN l\u00e0 g\u00ec? T\u00ean mi\u1ec1n \u0111\u1ea7y \u0111\u1ee7 v\u00e0 d\u1ea5u ch\u1ea5m cu\u1ed1i<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/subdomain-la-gi\/\">Subdomain l\u00e0 g\u00ec? Kh\u00e1c g\u00ec t\u00ean mi\u1ec1n ch\u00ednh<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/ddns-la-gi\/\">DDNS l\u00e0 g\u00ec? T\u00ean mi\u1ec1n cho m\u1ea1ng c\u00f3 IP \u0111\u1ed9ng<\/a><\/li>\n<\/ul>\n\n\n\n<h3 id=\"H\u01b0\u1edbng_d\u1eabn_v\u00e0_s\u1eeda_l\u1ed7i\">H\u01b0\u1edbng d\u1eabn v\u00e0 s\u1eeda l\u1ed7i<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/tino.vn\/blog\/xac-minh-quyen-so-huu-ten-mien-bang-dns\/\">X\u00e1c minh quy\u1ec1n s\u1edf h\u1eefu t\u00ean mi\u1ec1n b\u1eb1ng b\u1ea3n ghi DNS<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/cach-tao-subdomain\/\">C\u00e1ch t\u1ea1o subdomain tr\u00ean cPanel<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/cai-dat-wordpress-tren-subdomain\/\">C\u00e0i \u0111\u1eb7t WordPress tr\u00ean subdomain<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/ipconfig-flushdns-la-gi\/\">ipconfig \/flushdns l\u00e0 g\u00ec? C\u00e1ch xo\u00e1 cache DNS<\/a><\/li>\n\n\n<li><a href=\"https:\/\/tino.vn\/blog\/cach-sua-loi-dns-probe-finished-nxdomain-tren-dien-thoai\/\">S\u1eeda l\u1ed7i DNS_PROBE_FINISHED_NXDOMAIN tr\u00ean \u0111i\u1ec7n tho\u1ea1i<\/a><\/li>\n<\/ul>\n\n\n\n<h3 id=\"Cloudflare\">Cloudflare<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/tino.vn\/blog\/cloudflare-la-gi\/\">Cloudflare l\u00e0 g\u00ec? D\u00f9ng Cloudflare l\u00e0m nameserver, Proxied v\u00e0 DNS only, Railgun \u0111\u00e3 ng\u1eebng<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">C\u1ea7n t\u00ean mi\u1ec1n cho website? <a href=\"https:\/\/tino.vn\/ten-mien\">\u0110\u0103ng k\u00fd t\u00ean mi\u1ec1n t\u1ea1i Tino<\/a>: ki\u1ec3m tra t\u00ean mi\u1ec1n c\u00f2n tr\u1ed1ng, \u0111\u0103ng k\u00fd .vn v\u00e0 qu\u1ed1c t\u1ebf, qu\u1ea3n l\u00fd DNS trong m\u1ed9t t\u00e0i kho\u1ea3n. Xem gi\u00e1 tr\u00ean trang s\u1ea3n ph\u1ea9m.<\/p>\n\n\n\n<h2 id=\"C\u00e2u_h\u1ecfi_th\u01b0\u1eddng_g\u1eb7p\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"DNS_c\u00e1_nh\u00e2n_(DNS_ri\u00eang_t\u01b0)_tr\u00ean_\u0111i\u1ec7n_tho\u1ea1i_l\u00e0_g\u00ec?\">DNS c\u00e1 nh\u00e2n (DNS ri\u00eang t\u01b0) tr\u00ean \u0111i\u1ec7n tho\u1ea1i l\u00e0 g\u00ec?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">DNS ri\u00eang t\u01b0 (Private DNS) l\u00e0 t\u00ednh n\u0103ng c\u1ee7a Android cho ph\u00e9p \u0111i\u1ec7n tho\u1ea1i g\u1eedi truy v\u1ea5n DNS qua k\u1ebft n\u1ed1i m\u00e3 ho\u00e1 DNS over TLS t\u1edbi m\u1ed9t resolver b\u1ea1n ch\u1ecdn, nh\u1eadp b\u1eb1ng t\u00ean m\u00e1y ch\u1ee7 thay v\u00ec IP, v\u00ed d\u1ee5 dns.google c\u1ee7a Google ho\u1eb7c one.one.one.one c\u1ee7a Cloudflare. Ch\u1ebf \u0111\u1ed9 &#8220;T\u1ef1 \u0111\u1ed9ng&#8221; s\u1ebd d\u00f9ng m\u00e3 ho\u00e1 khi m\u1ea1ng h\u1ed7 tr\u1ee3.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"\u0110\u1ed5i_DNS_c\u00f3_an_to\u00e0n_kh\u00f4ng?\">\u0110\u1ed5i DNS c\u00f3 an to\u00e0n kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed5i DNS resolver tr\u00ean m\u00e1y t\u00ednh hay \u0111i\u1ec7n tho\u1ea1i kh\u00f4ng l\u00e0m h\u1ecfng thi\u1ebft b\u1ecb v\u00e0 c\u00f3 th\u1ec3 \u0111\u1ed5i l\u1ea1i b\u1ea5t c\u1ee9 l\u00fac n\u00e0o. \u0110i\u1ec1u c\u1ea7n c\u00e2n nh\u1eafc l\u00e0 quy\u1ec1n ri\u00eang t\u01b0: resolver b\u1ea1n ch\u1ecdn s\u1ebd th\u1ea5y c\u00e1c t\u00ean mi\u1ec1n b\u1ea1n truy c\u1eadp, n\u00ean ch\u1ec9 d\u00f9ng resolver c\u1ee7a nh\u00e0 m\u1ea1ng ho\u1eb7c d\u1ecbch v\u1ee5 c\u00f3 ch\u00ednh s\u00e1ch c\u00f4ng khai.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"DNS_lookup_l\u00e0_g\u00ec?\">DNS lookup l\u00e0 g\u00ec?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">DNS lookup l\u00e0 m\u1ed9t l\u1ea7n tra c\u1ee9u DNS: h\u1ecfi m\u1ed9t t\u00ean mi\u1ec1n \u0111\u1ec3 l\u1ea5y b\u1ea3n ghi, th\u01b0\u1eddng l\u00e0 IP. B\u1ea1n c\u00f3 th\u1ec3 t\u1ef1 tra b\u1eb1ng l\u1ec7nh <code>nslookup tino.vn<\/code> tr\u00ean Windows, <code>dig tino.vn<\/code> tr\u00ean Linux, macOS, ho\u1eb7c c\u00f4ng c\u1ee5 web Google Admin Toolbox Dig.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"M\u1ed9t_t\u00ean_mi\u1ec1n_c\u1ea7n_bao_nhi\u00eau_nameserver?\">M\u1ed9t t\u00ean mi\u1ec1n c\u1ea7n bao nhi\u00eau nameserver?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">T\u1ed1i thi\u1ec3u hai nameserver, theo khuy\u1ebfn ngh\u1ecb RFC 1912, \u0111\u1ec3 m\u1ed9t m\u00e1y l\u1ed7i th\u00ec m\u00e1y kia v\u1eabn tr\u1ea3 l\u1eddi. Nhi\u1ec1u nh\u00e0 \u0111\u0103ng k\u00fd cho khai t\u1eeb 2 \u0111\u1ebfn 4 ho\u1eb7c nhi\u1ec1u h\u01a1n. Xem th\u00eam \u1edf b\u00e0i <a href=\"https:\/\/tino.vn\/blog\/name-servers-la-gi\/\">name server l\u00e0 g\u00ec<\/a>.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\n<script type=\"application\/ld+json\">\n\t{\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"DNS c\u00e1 nh\u00e2n (DNS ri\u00eang t\u01b0) tr\u00ean \u0111i\u1ec7n tho\u1ea1i l\u00e0 g\u00ec?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>DNS ri\u00eang t\u01b0 (Private DNS) l\u00e0 t\u00ednh n\u0103ng c\u1ee7a Android cho ph\u00e9p \u0111i\u1ec7n tho\u1ea1i g\u1eedi truy v\u1ea5n DNS qua k\u1ebft n\u1ed1i m\u00e3 ho\u00e1 DNS over TLS t\u1edbi m\u1ed9t resolver b\u1ea1n ch\u1ecdn, nh\u1eadp b\u1eb1ng t\u00ean m\u00e1y ch\u1ee7 thay v\u00ec IP, v\u00ed d\u1ee5 dns.google c\u1ee7a Google ho\u1eb7c one.one.one.one c\u1ee7a Cloudflare. Ch\u1ebf \u0111\u1ed9 \\\"T\u1ef1 \u0111\u1ed9ng\\\" s\u1ebd d\u00f9ng m\u00e3 ho\u00e1 khi m\u1ea1ng h\u1ed7 tr\u1ee3.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"\u0110\u1ed5i DNS c\u00f3 an to\u00e0n kh\u00f4ng?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>\u0110\u1ed5i DNS resolver tr\u00ean m\u00e1y t\u00ednh hay \u0111i\u1ec7n tho\u1ea1i kh\u00f4ng l\u00e0m h\u1ecfng thi\u1ebft b\u1ecb v\u00e0 c\u00f3 th\u1ec3 \u0111\u1ed5i l\u1ea1i b\u1ea5t c\u1ee9 l\u00fac n\u00e0o. \u0110i\u1ec1u c\u1ea7n c\u00e2n nh\u1eafc l\u00e0 quy\u1ec1n ri\u00eang t\u01b0: resolver b\u1ea1n ch\u1ecdn s\u1ebd th\u1ea5y c\u00e1c t\u00ean mi\u1ec1n b\u1ea1n truy c\u1eadp, n\u00ean ch\u1ec9 d\u00f9ng resolver c\u1ee7a nh\u00e0 m\u1ea1ng ho\u1eb7c d\u1ecbch v\u1ee5 c\u00f3 ch\u00ednh s\u00e1ch c\u00f4ng khai.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"DNS lookup l\u00e0 g\u00ec?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>DNS lookup l\u00e0 m\u1ed9t l\u1ea7n tra c\u1ee9u DNS: h\u1ecfi m\u1ed9t t\u00ean mi\u1ec1n \u0111\u1ec3 l\u1ea5y b\u1ea3n ghi, th\u01b0\u1eddng l\u00e0 IP. B\u1ea1n c\u00f3 th\u1ec3 t\u1ef1 tra b\u1eb1ng l\u1ec7nh nslookup tino.vn tr\u00ean Windows, dig tino.vn tr\u00ean Linux, macOS, ho\u1eb7c c\u00f4ng c\u1ee5 web Google Admin Toolbox Dig.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"M\u1ed9t t\u00ean mi\u1ec1n c\u1ea7n bao nhi\u00eau nameserver?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>T\u1ed1i thi\u1ec3u hai nameserver, theo khuy\u1ebfn ngh\u1ecb RFC 1912, \u0111\u1ec3 m\u1ed9t m\u00e1y l\u1ed7i th\u00ec m\u00e1y kia v\u1eabn tr\u1ea3 l\u1eddi. Nhi\u1ec1u nh\u00e0 \u0111\u0103ng k\u00fd cho khai t\u1eeb 2 \u0111\u1ebfn 4 ho\u1eb7c nhi\u1ec1u h\u01a1n. Xem th\u00eam \u1edf b\u00e0i <a>name server l\u00e0 g\u00ec<\/a>.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t\t\t\t]\n\t}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>DNS (Domain Name System, h\u1ec7 th\u1ed1ng ph\u00e2n gi\u1ea3i t\u00ean mi\u1ec1n) l\u00e0 h\u1ec7 th\u1ed1ng chuy\u1ec3n t\u00ean mi\u1ec1n d\u1ec5 nh\u1edb nh\u01b0 tino.vn th\u00e0nh \u0111\u1ecba ch\u1ec9 IP m\u00e0 m\u00e1y t\u00ednh d\u00f9ng \u0111\u1ec3 k\u1ebft n\u1ed1i, nh\u1edd \u0111\u00f3 tr\u00ecnh duy\u1ec7t t\u00ecm \u0111\u00fang m\u00e1y ch\u1ee7 c\u1ee7a website, c\u00f2n email t\u00ecm \u0111\u00fang m\u00e1y ch\u1ee7 nh\u1eadn th\u01b0. M\u1ed7i l\u1ea7n b\u1ea1n m\u1edf m\u1ed9t trang [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":132548,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7729],"tags":[6394],"class_list":["post-236","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dns","tag-kien-thuc-hosting"],"_links":{"self":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/comments?post=236"}],"version-history":[{"count":3,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/236\/revisions"}],"predecessor-version":[{"id":132728,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/236\/revisions\/132728"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media\/132548"}],"wp:attachment":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media?parent=236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/categories?post=236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/tags?post=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}