{"id":22029,"date":"2021-02-04T17:47:01","date_gmt":"2021-02-04T10:47:01","guid":{"rendered":"https:\/\/speed.family\/?p=19118"},"modified":"2023-07-23T20:05:59","modified_gmt":"2023-07-23T13:05:59","slug":"time-to-live-ttl-la-gi","status":"publish","type":"post","link":"https:\/\/kiencang.net\/time-to-live-ttl-la-gi\/","title":{"rendered":"Time To Live (TTL) l\u00e0 g\u00ec? Nghe c\u00f3 m\u00f9i nh\u01b0 s\u1ed1ng &#038; ch\u1ebft \u1ea5y nh\u1ec9! \u1edc, th\u1ebf m\u00e0 \u0111\u00fang \u0111\u1ea5y \u1ea1!"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"time-to-live-ttl-trong-m\u1ea1ng-la-gi\">Time-to-live (TTL) trong m\u1ea1ng l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p>Time to live (TTL) li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng th\u1eddi gian ho\u1eb7c &#8220;hops&#8221; m\u00e0 m\u1ed9t g\u00f3i tin \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp t\u1ed3n t\u1ea1i b\u00ean trong m\u1ea1ng tr\u01b0\u1edbc khi n\u00f3 b\u1ecb b\u1ecf \u0111i b\u1edfi b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn (router). <\/p>\n\n\n\n<p>TTL c\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng trong caching CDN v\u00e0 DNS caching.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ttl-ho\u1ea1t-d\u1ed9ng-nh\u01b0-th\u1ebf-nao\">TTL ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n\n\n\n<p>Khi m\u1ed9t g\u00f3i tin \u0111\u01b0\u1ee3c t\u1ea1o v\u00e0 g\u1eedi qua internet, c\u00f3 nguy c\u01a1 l\u00e0 n\u00f3 s\u1ebd ti\u1ebfp t\u1ee5c \u0111\u01b0\u1ee3c chuy\u1ec3n qua t\u1eeb b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn n\u00e0y \u0111\u1ebfn b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn kh\u00e1c m\u1ed9t c\u00e1ch v\u00f4 t\u1eadn. \u0110\u1ec3 gi\u1ea3m thi\u1ec3u kh\u1ea3 n\u0103ng n\u00e0y, g\u00f3i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf c\u00f9ng v\u1edbi th\u1eddi \u0111i\u1ec3m h\u1ebft h\u1ea1n g\u1ecdi l\u00e0 time-to-live ho\u1eb7c gi\u1edbi h\u1ea1n hop (hop limit). <\/p>\n\n\n\n<p>TTL c\u1ee7a g\u00f3i c\u0169ng c\u00f3 th\u1ec3 h\u1eefu \u00edch trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh m\u1ed9t g\u00f3i \u0111\u01b0\u1ee3c l\u01b0u h\u00e0nh trong bao l\u00e2u, v\u00e0 cho ng\u01b0\u1eddi g\u1eedi c\u00f3 kh\u1ea3 n\u0103ng nh\u1eadn th\u00f4ng tin v\u1ec1 qu\u00e3ng \u0111\u01b0\u1eddng c\u1ee7a g\u00f3i tin tr\u00ean internet.<\/p>\n\n\n\n<p>M\u1ed7i g\u00f3i tin \u0111\u1ec1u c\u00f3 m\u1ed9t v\u00f9ng \u0111\u1ec3 n\u00f3 l\u01b0u m\u1ed9t gi\u00e1 tr\u1ecb s\u1ed1 x\u00e1c \u0111\u1ecbnh n\u00f3 \u0111\u01b0\u1ee3c ph\u00e9p ti\u1ebfp t\u1ee5c l\u01b0u chuy\u1ec3n qua m\u1ea1ng bao l\u00e2u n\u1eefa. M\u1ed7i khi b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn nh\u1eadn m\u1ed9t g\u00f3i tin, n\u00f3 tr\u1eeb \u0111i m\u1ed9t t\u1eeb b\u1ed9 \u0111\u1ebfm TTL v\u00e0 sau \u0111\u00f3 chuy\u1ec3n n\u00f3 \u0111\u1ebfn \u0111\u1ecba \u0111i\u1ec3m k\u1ebf ti\u1ebfp trong h\u1ec7 th\u1ed1ng m\u1ea1ng. N\u1ebfu \u1edf b\u1ea5t c\u1ee9 \u0111i\u1ec3m n\u00e0o b\u1ed9 \u0111\u1ebfm TTL c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng kh\u00f4ng sau khi \u0111\u00e3 tr\u1eeb b\u1edbt, b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn s\u1ebd b\u1ecf \u0111i g\u00f3i tin v\u00e0 g\u1eedi th\u00f4ng b\u00e1o ICMP quay tr\u1edf l\u1ea1i hosting g\u1ed1c.<\/p>\n\n\n\n<p>C\u00e1c c\u00e2u l\u1ec7nh m\u1ea1ng th\u01b0\u1eddng d\u00f9ng l\u00e0 ping &amp; traceroute \u0111\u1ec1u s\u1eed d\u1ee5ng TTL. Khi s\u1eed d\u1ee5ng l\u1ec7nh traceroute, m\u1ed9t lu\u1ed3ng c\u00e1c g\u00f3i tin v\u1edbi tr\u00ecnh t\u1ef1 TTL ng\u00e0y c\u00e0ng t\u0103ng \u0111\u01b0\u1ee3c g\u1eedi qua Internet h\u01b0\u1edbng \u0111\u1ebfn \u0111\u00edch. <\/p>\n\n\n\n<p>V\u00ec m\u1ed7i b\u01b0\u1edbc d\u1ecdc theo k\u1ebft n\u1ed1i l\u00e0 \u0111i\u1ec3m d\u1eebng cu\u1ed1i cho m\u1ed9t trong c\u00e1c g\u00f3i, m\u1ed7i v\u1ecb tr\u00ed s\u1ebd tr\u1ea3 v\u1ec1 th\u00f4ng \u0111i\u1ec7p ICMP cho b\u00ean g\u1eedi \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh xem m\u1ea5t bao l\u00e2u \u0111\u1ec3 \u0111i \u0111\u1ebfn m\u1ed7i b\u01b0\u1edbc nh\u1ea3y (hop) li\u00ean ti\u1ebfp d\u1ecdc theo m\u1ea1ng.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/time-to-live-1024x681.png\" alt=\"Time to live c\u1ee7a g\u00f3i tin khi \u0111i qua c\u00e1c b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn\" class=\"wp-image-19120\"\/><\/figure><\/div>\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"time-to-live-d\u01b0\u1ee3c-s\u1eed-d\u1ee5ng-trong-cac-hoan-c\u1ea3nh-nao\">Time to live \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c ho\u00e0n c\u1ea3nh n\u00e0o?<\/h2>\n\n\n\n<p>Ngo\u00e0i chuy\u1ec7n \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 truy t\u00ecm tuy\u1ebfn \u0111\u01b0\u1eddng m\u00e0 g\u00f3i tin \u0111i qua tr\u00ean Internet, time-to-live c\u0169ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong b\u1ed1i c\u1ea3nh thi\u1ebft l\u1eadp m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh cho th\u00f4ng tin caching. <\/p>\n\n\n\n<p>Thay v\u00ec \u0111o th\u1eddi gian trong c\u00e1c hop gi\u1eefa c\u00e1c b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn, m\u1ed7i c\u00e1i trong s\u1ed1 \u0111\u00f3 c\u00f3 th\u1ec3 m\u1ea5t m\u1ed9t l\u01b0\u1ee3ng th\u1eddi gian kh\u00e1c nhau, m\u1ed9t s\u1ed1 m\u1ea1ng s\u1eed d\u1ee5ng theo ki\u1ec3u truy\u1ec1n th\u1ed1ng nhi\u1ec1u h\u01a1n.<\/p>\n\n\n\n<p>M\u1ea1ng CDN nh\u01b0 Cloudflare th\u01b0\u1eddng s\u1eed d\u1ee5ng TTL \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh xem n\u1ed9i dung \u0111\u00e3 \u0111\u01b0\u1ee3c cache bao l\u00e2u r\u1ed3i t\u1eeb <a href=\"https:\/\/kiencang.net\/may-chu-bien-cdn\/\" target=\"_blank\" rel=\"noreferrer noopener\">m\u00e1y ch\u1ee7 bi\u00ean CDN<\/a> tr\u01b0\u1edbc khi n\u00f3 c\u1ea7n m\u1ed9t b\u1ea3n sao ch\u00e9p m\u1edbi \u0111\u01b0\u1ee3c t\u00ecm n\u1ea1p (fetch) t\u1eeb <a href=\"https:\/\/kiencang.net\/may-chu-goc\/\" target=\"_blank\" rel=\"noreferrer noopener\">m\u00e1y ch\u1ee7 g\u1ed1c<\/a>. <\/p>\n\n\n\n<p>B\u1eb1ng c\u00e1ch c\u00e0i \u0111\u1eb7t ch\u00ednh x\u00e1c l\u01b0\u1ee3ng th\u1eddi gian gi\u1eefa c\u00e1c l\u1ea7n k\u00e9o (pull) th\u00f4ng tin t\u1eeb m\u00e1y ch\u1ee7 g\u1ed1c, m\u1ea1ng CDN c\u00f3 kh\u1ea3 n\u0103ng c\u1eadp nh\u1eadt n\u1ed9i dung m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i li\u00ean t\u1ee5c g\u1ecdi \u0111\u1ebfn m\u00e1y ch\u1ee7 g\u1ed1c. Bi\u1ec7n ph\u00e1p t\u1ed1i \u01b0u ho\u00e1 n\u00e0y cho ph\u00e9p CDN ph\u1ee5c v\u1ee5 n\u1ed9i dung hi\u1ec7u qu\u1ea3 h\u01a1n nh\u1edd chuy\u1ec3n th\u00f4ng tin \u0111\u1ebfn g\u1ea7n ng\u01b0\u1eddi d\u00f9ng, \u0111\u1ed3ng th\u1eddi n\u00f3 c\u0169ng gi\u00fap gi\u1ea3m b\u0103ng th\u00f4ng cho m\u00e1y ch\u1ee7 g\u1ed1c.<\/p>\n\n\n\n<p>Trong b\u1ed1i c\u1ea3nh <a href=\"https:\/\/kiencang.net\/dns-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e1c b\u1ea3n ghi DNS<\/a>, TTL l\u00e0 gi\u00e1 tr\u1ecb s\u1ed1 gi\u00fap x\u00e1c \u0111\u1ecbnh th\u1eddi gian cache c\u1ee7a m\u00e1y ch\u1ee7 DNS g\u1eedi c\u00e1c b\u1ea3n ghi DNS tr\u01b0\u1edbc khi ph\u1ea3i l\u1ea5y l\u1ea1i th\u00f4ng tin t\u1eeb m\u00e1y ch\u1ee7 DNS c\u00f3 th\u1ea9m quy\u1ec1n (authoritative DNS server) v\u00e0 l\u1ea5y b\u1ea3n sao m\u1edbi c\u1ee7a b\u1ea3n ghi t\u1eeb \u0111\u00f3.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft <a href=\"https:\/\/www.cloudflare.com\/learning\/cdn\/glossary\/time-to-live-ttl\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">What is time-to-live (TTL)? | TTL definition<\/a> c\u1ee7a Cloudflare)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Time-to-live (TTL) trong m\u1ea1ng l\u00e0 g\u00ec? Time to live (TTL) li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng th\u1eddi gian ho\u1eb7c &#8220;hops&#8221; m\u00e0 m\u1ed9t g\u00f3i tin \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp t\u1ed3n t\u1ea1i b\u00ean trong m\u1ea1ng tr\u01b0\u1edbc khi n\u00f3 b\u1ecb b\u1ecf \u0111i b\u1edfi b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn (router). TTL c\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng trong caching CDN v\u00e0 DNS caching. TTL ho\u1ea1t \u0111\u1ed9ng nh\u01b0 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[249,252],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Time To Live (TTL) l\u00e0 g\u00ec? Nghe c\u00f3 m\u00f9i nh\u01b0 s\u1ed1ng &amp; ch\u1ebft \u1ea5y nh\u1ec9! \u1edc, th\u1ebf m\u00e0 \u0111\u00fang \u0111\u1ea5y \u1ea1! &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/time-to-live-ttl-la-gi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Time To Live (TTL) l\u00e0 g\u00ec? Nghe c\u00f3 m\u00f9i nh\u01b0 s\u1ed1ng &amp; ch\u1ebft \u1ea5y nh\u1ec9! \u1edc, th\u1ebf m\u00e0 \u0111\u00fang \u0111\u1ea5y \u1ea1! &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Time-to-live (TTL) trong m\u1ea1ng l\u00e0 g\u00ec? Time to live (TTL) li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng th\u1eddi gian ho\u1eb7c &#8220;hops&#8221; m\u00e0 m\u1ed9t g\u00f3i tin \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp t\u1ed3n t\u1ea1i b\u00ean trong m\u1ea1ng tr\u01b0\u1edbc khi n\u00f3 b\u1ecb b\u1ecf \u0111i b\u1edfi b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn (router). TTL c\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng trong caching CDN v\u00e0 DNS caching. TTL ho\u1ea1t \u0111\u1ed9ng nh\u01b0 &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/time-to-live-ttl-la-gi\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-04T10:47:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-23T13:05:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/02\/time-to-live-1024x681.png\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Time To Live (TTL) l\u00e0 g\u00ec? Nghe c\u00f3 m\u00f9i nh\u01b0 s\u1ed1ng & ch\u1ebft \u1ea5y nh\u1ec9! \u1edc, th\u1ebf m\u00e0 \u0111\u00fang \u0111\u1ea5y \u1ea1! &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/time-to-live-ttl-la-gi\/","og_locale":"vi_VN","og_type":"article","og_title":"Time To Live (TTL) l\u00e0 g\u00ec? Nghe c\u00f3 m\u00f9i nh\u01b0 s\u1ed1ng & ch\u1ebft \u1ea5y nh\u1ec9! \u1edc, th\u1ebf m\u00e0 \u0111\u00fang \u0111\u1ea5y \u1ea1! &#8226; Ki\u1ebfn c\u00e0ng","og_description":"Time-to-live (TTL) trong m\u1ea1ng l\u00e0 g\u00ec? Time to live (TTL) li\u00ean quan \u0111\u1ebfn l\u01b0\u1ee3ng th\u1eddi gian ho\u1eb7c &#8220;hops&#8221; m\u00e0 m\u1ed9t g\u00f3i tin \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp t\u1ed3n t\u1ea1i b\u00ean trong m\u1ea1ng tr\u01b0\u1edbc khi n\u00f3 b\u1ecb b\u1ecf \u0111i b\u1edfi b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn (router). TTL c\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng trong caching CDN v\u00e0 DNS caching. 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