{"id":478195,"date":"2023-08-09T09:28:42","date_gmt":"2023-08-09T09:28:42","guid":{"rendered":""},"modified":"2023-09-05T11:16:13","modified_gmt":"2023-09-05T11:16:13","slug":"network-time-protocol","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/network-time-protocol\/","title":{"rendered":"Giao th\u1ee9c th\u1eddi gian m\u1ea1ng"},"content":{"rendered":"<p>Th\u00f4ng tin t\u00f3m t\u1eaft v\u1ec1 Giao th\u1ee9c th\u1eddi gian m\u1ea1ng<\/p>\n<p>Giao th\u1ee9c th\u1eddi gian m\u1ea1ng (NTP) l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng quan tr\u1ecdng gi\u00fap \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ed3ng h\u1ed3 c\u1ee7a m\u00e1y t\u00ednh v\u00e0 thi\u1ebft b\u1ecb trong m\u1ea1ng v\u1edbi ngu\u1ed3n th\u1eddi gian chung. N\u00f3 r\u1ea5t c\u1ea7n thi\u1ebft cho c\u00e1c \u1ee9ng d\u1ee5ng v\u00e0 h\u1ec7 th\u1ed1ng d\u1ef1a v\u00e0o vi\u1ec7c ch\u1ea5m c\u00f4ng ch\u00ednh x\u00e1c, cung c\u1ea5p s\u1ef1 ph\u1ed1i h\u1ee3p v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n c\u1ee7a ho\u1ea1t \u0111\u1ed9ng tr\u00ean nhi\u1ec1u n\u1ec1n t\u1ea3ng kh\u00e1c nhau.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a giao th\u1ee9c th\u1eddi gian m\u1ea1ng v\u00e0 s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean v\u1ec1 n\u00f3<\/h2>\n<p>Ngu\u1ed3n g\u1ed1c c\u1ee7a NTP b\u1eaft \u0111\u1ea7u t\u1eeb n\u0103m 1981 khi n\u00f3 \u0111\u01b0\u1ee3c David L. Mills m\u00f4 t\u1ea3 l\u1ea7n \u0111\u1ea7u ti\u00ean trong RFC 778. Nhu c\u1ea7u v\u1ec1 th\u1eddi gian \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 h\u00f3a tr\u00ean c\u00e1c m\u1ea1ng ng\u00e0y c\u00e0ng tr\u1edf n\u00ean r\u00f5 r\u00e0ng v\u00e0 kh\u00e1i ni\u1ec7m c\u1ee7a Mills \u0111\u00e3 \u0111\u1eb7t n\u1ec1n m\u00f3ng cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a giao th\u1ee9c. NTP \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a ch\u00ednh th\u1ee9c trong RFC 958 n\u0103m 1985 v\u00e0 \u0111\u00e3 tr\u1ea3i qua nhi\u1ec1u l\u1ea7n s\u1eeda \u0111\u1ed5i v\u00e0 c\u1ea3i ti\u1ebfn k\u1ec3 t\u1eeb \u0111\u00f3.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Giao th\u1ee9c th\u1eddi gian m\u1ea1ng: M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1<\/h2>\n<p>NTP s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng ngu\u1ed3n th\u1eddi gian ph\u00e2n c\u1ea5p, n\u1eeda l\u1edbp, \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i th\u00e0nh c\u00e1c c\u1ea5p \u0111\u1ed9 t\u1ea7ng. T\u1ea7ng 0 bao g\u1ed3m c\u00e1c ngu\u1ed3n th\u1eddi gian c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao nh\u01b0 \u0111\u1ed3ng h\u1ed3 nguy\u00ean t\u1eed, v\u1edbi c\u00e1c t\u1ea7ng th\u1ea5p h\u01a1n d\u1ea7n d\u1ea7n k\u00e9m ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n<ul>\n<li><strong>T\u1ea7ng 0:<\/strong> \u0110\u1ed3ng h\u1ed3 nguy\u00ean t\u1eed, \u0111\u1ed3ng h\u1ed3 GPS<\/li>\n<li><strong>T\u1ea7ng 1:<\/strong> M\u00e1y t\u00ednh \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i tr\u1ef1c ti\u1ebfp v\u1edbi thi\u1ebft b\u1ecb Stratum 0<\/li>\n<li><strong>T\u1ea7ng 2:<\/strong> C\u00e1c thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 Stratum 1<\/li>\n<li><strong>T\u1ea7ng 3 tr\u1edf l\u00ean:<\/strong> C\u00e1c l\u1edbp m\u00e1y ch\u1ee7 v\u00e0 m\u00e1y kh\u00e1ch k\u1ebf ti\u1ebfp nhau<\/li>\n<\/ul>\n<p>NTP s\u1eed d\u1ee5ng Giao th\u1ee9c g\u00f3i d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng (UDP) qua c\u1ed5ng 123 \u0111\u1ec3 li\u00ean l\u1ea1c v\u00e0 c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh th\u1eddi gian d\u1ea7n d\u1ea7n \u0111\u1ec3 tr\u00e1nh thay \u0111\u1ed5i \u0111\u1ed9t ng\u1ed9t, \u0111\u1ea3m b\u1ea3o qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i su\u00f4n s\u1ebb.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Giao th\u1ee9c th\u1eddi gian m\u1ea1ng: C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>NTP ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch \u0111o th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 tin nh\u1eafn truy\u1ec1n t\u1eeb m\u00e1y kh\u00e1ch \u0111\u1ebfn m\u00e1y ch\u1ee7 v\u00e0 quay l\u1ea1i. N\u00f3 t\u00ednh to\u00e1n s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa th\u1eddi gian c\u1ee7a m\u00e1y ch\u1ee7 v\u00e0 m\u00e1y kh\u00e1ch v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c \u0111i\u1ec1u ch\u1ec9nh c\u1ea7n thi\u1ebft.<\/p>\n<ol>\n<li><strong>L\u1eddi y\u00eau c\u1ea7u:<\/strong> M\u00e1y kh\u00e1ch g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn m\u00e1y ch\u1ee7 c\u00f3 ch\u1ee9a d\u1ea5u th\u1eddi gian.<\/li>\n<li><strong>Nh\u1eadn v\u00e0 truy\u1ec1n:<\/strong> M\u00e1y ch\u1ee7 th\u00eam d\u1ea5u th\u1eddi gian khi nh\u1eadn \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u v\u00e0 khi ph\u1ea3n h\u1ed3i \u0111\u01b0\u1ee3c g\u1eedi.<\/li>\n<li><strong>T\u00ednh to\u00e1n &amp; \u0110i\u1ec1u ch\u1ec9nh:<\/strong> M\u00e1y kh\u00e1ch t\u00ednh to\u00e1n \u0111\u1ed9 tr\u1ec5 v\u00e0 \u0111\u1ed9 l\u1ec7ch c\u1ee7a chuy\u1ebfn \u0111i kh\u1ee9 h\u1ed3i, \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ed3ng h\u1ed3 cho ph\u00f9 h\u1ee3p.<\/li>\n<\/ol>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Giao th\u1ee9c th\u1eddi gian m\u1ea1ng<\/h2>\n<ul>\n<li><strong>S\u1ef1 ch\u00ednh x\u00e1c:<\/strong> NTP c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ch\u00ednh x\u00e1c trong v\u00f2ng 10 mili gi\u00e2y qua internet c\u00f4ng c\u1ed9ng.<\/li>\n<li><strong>Uy\u1ec3n chuy\u1ec3n:<\/strong> N\u00f3 c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean nhi\u1ec1u c\u1ea5u tr\u00fac li\u00ean k\u1ebft m\u1ea1ng kh\u00e1c nhau v\u00e0 h\u1ed7 tr\u1ee3 c\u00e1c ngu\u1ed3n th\u1eddi gian kh\u00e1c nhau.<\/li>\n<li><strong>B\u1ea3o v\u1ec7:<\/strong> C\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt nh\u01b0 x\u00e1c th\u1ef1c \u0111\u01b0\u1ee3c tri\u1ec3n khai \u0111\u1ec3 ng\u0103n ch\u1eb7n c\u00e1c thay \u0111\u1ed5i th\u1eddi gian c\u00f3 h\u1ea1i.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i giao th\u1ee9c th\u1eddi gian m\u1ea1ng<\/h2>\n<p>\u0110\u00e2y l\u00e0 b\u1ea3ng n\u00eau b\u1eadt hai phi\u00ean b\u1ea3n ch\u00ednh c\u1ee7a NTP:<\/p>\n<table>\n<thead>\n<tr>\n<th>Phi\u00ean b\u1ea3n<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>NTP<\/td>\n<td>Th\u1ef1c hi\u1ec7n \u0111\u1ea7y \u0111\u1ee7, ph\u00f9 h\u1ee3p v\u1edbi m\u1ecdi t\u00ecnh hu\u1ed1ng.<\/td>\n<\/tr>\n<tr>\n<td>SNTP (NTP \u0111\u01a1n gi\u1ea3n)<\/td>\n<td>Phi\u00ean b\u1ea3n \u0111\u01a1n gi\u1ea3n h\u00f3a, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng \u00edt quan tr\u1ecdng h\u01a1n.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng Giao th\u1ee9c th\u1eddi gian m\u1ea1ng, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p c\u1ee7a ch\u00fang<\/h2>\n<ul>\n<li><strong>C\u00f4ng d\u1ee5ng:<\/strong> \u0110\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ed3ng h\u1ed3 h\u1ec7 th\u1ed1ng, ph\u1ed1i h\u1ee3p trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, ghi nh\u1eadt k\u00fd v\u00e0 theo d\u00f5i.<\/li>\n<li><strong>C\u00e1c v\u1ea5n \u0111\u1ec1:<\/strong> S\u1ef1 ch\u1eadm tr\u1ec5 c\u1ee7a m\u1ea1ng, c\u00e1c cu\u1ed9c t\u1ea5n c\u00f4ng \u0111\u1ed9c h\u1ea1i, kh\u00f4ng t\u01b0\u01a1ng th\u00edch ph\u1ea7n c\u1ee9ng.<\/li>\n<li><strong>C\u00e1c gi\u1ea3i ph\u00e1p:<\/strong> S\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 NTP \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c, c\u1ea5u h\u00ecnh t\u01b0\u1eddng l\u1eeda ph\u00f9 h\u1ee3p, ch\u1ecdn ngu\u1ed3n th\u1eddi gian ph\u00f9 h\u1ee3p.<\/li>\n<\/ul>\n<h2>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>So s\u00e1nh NTP v\u1edbi c\u00e1c giao th\u1ee9c \u0111\u1ed3ng b\u1ed9 h\u00f3a th\u1eddi gian kh\u00e1c:<\/p>\n<table>\n<thead>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>NTP<\/th>\n<th>PTP (Giao th\u1ee9c th\u1eddi gian ch\u00ednh x\u00e1c)<\/th>\n<th>TSP (Giao th\u1ee9c \u0111\u1ed3ng b\u1ed9 h\u00f3a th\u1eddi gian)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>S\u1ef1 ch\u00ednh x\u00e1c<\/td>\n<td>Cao<\/td>\n<td>R\u1ea5t cao<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<td>Cao<\/td>\n<td>Th\u1ea5p<\/td>\n<\/tr>\n<tr>\n<td>B\u1ea3o v\u1ec7<\/td>\n<td>T\u1ed1t<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<td>Th\u1ea5p<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn NTP<\/h2>\n<p>Nh\u1eefng ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai c\u1ee7a NTP c\u00f3 th\u1ec3 bao g\u1ed3m nh\u1eefng c\u1ea3i ti\u1ebfn v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c, c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt v\u00e0 t\u00edch h\u1ee3p v\u1edbi c\u00e1c c\u00f4ng ngh\u1ec7 m\u1edbi nh\u01b0 thi\u1ebft b\u1ecb IoT.<\/p>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi giao th\u1ee9c th\u1eddi gian m\u1ea1ng<\/h2>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy gi\u1ed1ng nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p c\u00f3 th\u1ec3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 trong NTP b\u1eb1ng c\u00e1ch \u0111\u00f3ng vai tr\u00f2 trung gian, chuy\u1ec3n ti\u1ebfp c\u00e1c y\u00eau c\u1ea7u NTP v\u00e0 c\u00f3 th\u1ec3 cung c\u1ea5p c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt b\u1ed5 sung.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<ul>\n<li><a href=\"http:\/\/www.ntp.org\/\" target=\"_new\" rel=\"noopener nofollow\">Trang web ch\u00ednh th\u1ee9c c\u1ee7a NTP<\/a><\/li>\n<li><a href=\"https:\/\/tf.nist.gov\/\" target=\"_new\" rel=\"noopener nofollow\">B\u1ed9 ph\u1eadn Th\u1eddi gian v\u00e0 T\u1ea7n s\u1ed1 c\u1ee7a NIST<\/a><\/li>\n<li><a href=\"https:\/\/oneproxy.pro\/vn\/\" target=\"_new\" rel=\"noopener\">D\u1ecbch v\u1ee5 OneProxy<\/a><\/li>\n<li><a href=\"https:\/\/datatracker.ietf.org\/wg\/ntp\/about\/\" target=\"_new\" rel=\"noopener nofollow\">Nh\u00f3m l\u00e0m vi\u1ec7c IETF NTP<\/a><\/li>\n<\/ul>\n<p>\u0110\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi mu\u1ed1n t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 th\u1ebf gi\u1edbi c\u1ee7a Giao th\u1ee9c th\u1eddi gian m\u1ea1ng, c\u00e1c t\u00e0i nguy\u00ean n\u00e0y cung c\u1ea5p th\u00f4ng tin chi ti\u1ebft, ti\u00eau chu\u1ea9n v\u00e0 \u1ee9ng d\u1ee5ng to\u00e0n di\u1ec7n c\u1ee7a NTP. Cho d\u00f9 s\u1eed d\u1ee5ng cho m\u1ee5c \u0111\u00edch kinh doanh hay kh\u00e1m ph\u00e1 c\u00e1 nh\u00e2n, s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 NTP l\u00e0 \u0111i\u1ec1u then ch\u1ed1t trong th\u1eddi \u0111\u1ea1i k\u1ef9 thu\u1eadt s\u1ed1 k\u1ebft n\u1ed1i ng\u00e0y nay.<\/p>","protected":false},"featured_media":478196,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-478195","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Network Time Protocol: The Foundation of Time Synchronization<\/mark>","faq_items":[{"question":"What is Network Time Protocol (NTP)?","answer":"<p>Network Time Protocol (NTP) is a system designed to synchronize the clocks of computers and devices within a network to a common time source. It ensures accurate and coordinated timekeeping across various platforms and is widely used in various applications that require precise time measurements.<\/p>"},{"question":"How did Network Time Protocol originate?","answer":"<p>Network Time Protocol originated in 1981 when David L. Mills first described the concept in RFC 778. The formal definition came in 1985 with RFC 958, and since then, the protocol has undergone several revisions and improvements.<\/p>"},{"question":"What are the main features of NTP?","answer":"<p>The key features of NTP include high accuracy (often within 10 milliseconds over the public internet), flexibility to work across various network topologies, and security measures such as authentication to prevent unauthorized time alterations.<\/p>"},{"question":"How does Network Time Protocol work?","answer":"<p>NTP works by measuring the time it takes for a message to travel between a client and a server. It calculates the round-trip delay and the offset between server and client times, making the necessary adjustments to align the client's clock with the server's time.<\/p>"},{"question":"What types of Network Time Protocol exist?","answer":"<p>Two main versions of NTP exist: the full NTP implementation, suitable for all scenarios, and SNTP (Simple NTP), a simplified version suitable for less critical applications.<\/p>"},{"question":"What are the ways to use Network Time Protocol and the associated problems?","answer":"<p>NTP is used for synchronizing system clocks, coordination in distributed systems, logging, and tracking. Potential problems include network delays, malicious attacks, and hardware incompatibility. Solutions may involve using authenticated NTP servers, proper firewall configuration, and selecting suitable time sources.<\/p>"},{"question":"How does NTP compare with similar protocols?","answer":"<p>NTP offers high accuracy and good security but has moderate complexity. In comparison, PTP (Precision Time Protocol) offers very high accuracy but is more complex, while TSP (Time Sync Protocol) is simpler but offers moderate accuracy and low security.<\/p>"},{"question":"What are the future prospects related to Network Time Protocol?","answer":"<p>Future developments in NTP may include enhancements in accuracy, security measures, and integration with emerging technologies such as IoT devices.<\/p>"},{"question":"How can proxy servers be associated with Network Time Protocol?","answer":"<p>Proxy servers, like those provided by OneProxy, can act as intermediaries in NTP communication. They can forward NTP requests and may also provide additional security measures.<\/p>"},{"question":"Where can I find more information about Network Time Protocol?","answer":"<p>You can find more information about NTP from resources like the official NTP website, NIST's Time and Frequency Division, IETF NTP Working Group, and OneProxy's website. Links to these resources are available in the related links section of the article.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/478195\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/478196"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=478195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}