[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.web112.cz\/jak-funguje-dns-server\/#Article","mainEntityOfPage":"https:\/\/www.web112.cz\/jak-funguje-dns-server\/","headline":"Jak funguje DNS server?","name":"Jak funguje DNS server?","description":"Weby a v\u016fbec v\u0161echen internetov\u00fd obsah je ulo\u017een po cel\u00e9m sv\u011bt\u011b na stovk\u00e1ch, tis\u00edc\u00edch, milionech a mo\u017en\u00e1 dokonce na miliard\u00e1ch server\u016f. Ka\u017ed\u00fd z\u00a0nich m\u00e1 p\u0159i\u0159azenou konkr\u00e9tn\u00ed IP adresu. (nap\u0159\u00edklad \u010desk\u00fd vyhledava\u010d seznam.cz m\u00e1 IP adresu 77.75.72.3). Pokud j\u00ed nap\u00ed\u0161ete do vyhled\u00e1va\u010de, p\u0159ejdete na ten \u010di onen konkr\u00e9tn\u00ed web. Pamatovat si \u0159ady \u010d\u00edsel je pro n\u00e1s […]","datePublished":"2025-02-28","dateModified":"2023-05-01","author":{"@type":"Person","@id":"https:\/\/www.web112.cz\/author\/#Person","name":"web112.cz\n","url":"https:\/\/www.web112.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/4b051168bd2ace843d503d3432ebc4a96ac13303845197b3f2a2634cb21029f6?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/4b051168bd2ace843d503d3432ebc4a96ac13303845197b3f2a2634cb21029f6?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"web112.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.web112.cz\/wp-content\/uploads\/img_a344488_w2140_t1558349163.jpg","url":"https:\/\/www.web112.cz\/wp-content\/uploads\/img_a344488_w2140_t1558349163.jpg","height":0,"width":0},"url":"https:\/\/www.web112.cz\/jak-funguje-dns-server\/","about":["Www"],"wordCount":481,"articleBody":"Weby a v\u016fbec v\u0161echen internetov\u00fd obsah je ulo\u017een po cel\u00e9m sv\u011bt\u011b na stovk\u00e1ch, tis\u00edc\u00edch, milionech a mo\u017en\u00e1 dokonce na miliard\u00e1ch server\u016f. Ka\u017ed\u00fd z\u00a0nich m\u00e1 p\u0159i\u0159azenou konkr\u00e9tn\u00ed IP adresu. (nap\u0159\u00edklad \u010desk\u00fd vyhledava\u010d seznam.cz m\u00e1 IP adresu 77.75.72.3). Pokud j\u00ed nap\u00ed\u0161ete do vyhled\u00e1va\u010de, p\u0159ejdete na ten \u010di onen konkr\u00e9tn\u00ed web. Pamatovat si \u0159ady \u010d\u00edsel je pro n\u00e1s slo\u017eit\u00e9, a proto jim p\u0159id\u011blujeme jm\u00e9na.\u00a0 \u00a0Jak si ale v\u00e1\u0161 po\u010d\u00edta\u010d zjist\u00ed, jakou IP adresu m\u00e1 web, jeho\u017e n\u00e1zev jste zadali?\tNen\u00ed to nic moc slo\u017eit\u00e9ho! Funguje to na jednoduch\u00e9m a z\u00e1kladn\u00edm principu. Ka\u017ed\u00e1 internetov\u00e1 str\u00e1nka se skl\u00e1d\u00e1 z\u00a0n\u011bkolika \u010d\u00e1st\u00ed, nap\u0159\u00edklad www.bflmpsvz.cz \u2013 posledn\u00ed \u010d\u00e1st (.cz) je takzvan\u00e1 root dom\u00e9na. V\u00a0tomto p\u0159\u00edpad\u011b ozna\u010duje \u010ceskou republiku, jsou mo\u017en\u00e9 i ostatn\u00ed st\u00e1ty (.pl, .sk, .de, .uk,\u2026), zn\u00e1te tak\u00e9 jist\u011b zkratky pro organizace jako nap\u0159\u00edklad .com (d\u00e1le pak .gov, .org, .bar a dal\u0161\u00ed), pot\u00e9 mohou b\u00fdt dom\u00e9ny prvn\u00edho \u0159\u00e1du i nadn\u00e1rodn\u00ed (.eu). Ka\u017edou z\u00a0t\u011bchto root dom\u00e9n spravuje jin\u00fd server um\u00edst\u011bn\u00fd po sv\u011bt\u011b. Jako prvn\u00ed krok se n\u00e1\u0161 po\u010d\u00edta\u010d zept\u00e1 takzvan\u00fdch rootname server\u016f (t\u011bch je po sv\u011bt\u011b 13 a ozna\u010duj\u00ed se p\u00edsmeny A a\u017e M), kdo spravuje tuto p\u0159\u00edponu. V\u00a0na\u0161em p\u0159\u00edpad\u011b bude odk\u00e1z\u00e1n na \u010desk\u00e9ho spr\u00e1vce CZNIC, na jeho serveru se pak n\u00e1\u0161 po\u010d\u00edta\u010d dot\u00e1\u017ee na dom\u00e9nu druh\u00e9 \u00farovn\u011b (.bflmpsvz.) a n\u00e1sledn\u011b je ji\u017e odk\u00e1z\u00e1n p\u0159\u00edmo tam, kam se chceme dostat. Na t\u00e9to druh\u00e9 \u00farovni m\u016f\u017ee majitel webu m\u00edt prakticky cokoli bude cht\u00edt, nesm\u00ed pouze p\u0159es\u00e1hnout d\u00e9lku 63 znak\u016f a takov\u00e9 jm\u00e9no ji\u017e nesm\u00ed b\u00fdt obsazeno jin\u00fdm u\u017eivatelem internetu. T\u0159et\u00ed (nej\u010dast\u011bji www.) \u0159\u00e1d m\u016f\u017ee obsahovat op\u011bt libovoln\u00e9 znaky. P\u0159\u00edpadn\u011b se daj\u00ed dal\u0161\u00ed segmenty je\u0161t\u011b p\u0159idat vlevo od t\u00e9to \u010d\u00e1sti. Ka\u017ed\u00fd \u00fasek adresy sm\u00ed obsahovat ji\u017e zm\u00edn\u011bn\u00fdch maxim\u00e1ln\u011b 63 znak\u016f a dohromady nesm\u00ed d\u00e9lka p\u0159es\u00e1hnout 255 znak\u016f. Nyn\u00ed jsme si popsali takzvan\u00fd autoritativn\u00ed proces. Pokud prob\u011bhne, dos\u00e1hneme v\u017edy k\u00fd\u017een\u00e9ho c\u00edle.\t\tPokud n\u011bkter\u00e9 str\u00e1nky nav\u0161t\u011bvujete \u010dast\u011bji, ulo\u017e\u00ed se jejich IP do takzvan\u00e9 cash pam\u011bti, a cel\u00fd proces je jednodu\u0161\u0161\u00ed, jeliko\u017e vyhled\u00e1v\u00e1me hned danou str\u00e1nku. Takov\u00fd proces se naz\u00fdv\u00e1 neautoritativn\u00ed a jeho nev\u00fdhodou je, \u017ee p\u0159i zm\u011bn\u011b IP se m\u016f\u017ee st\u00e1t, \u017ee n\u00e1\u0161 po\u010d\u00edta\u010d bude m\u00edt pocit \u017ee dan\u00e9 str\u00e1nky p\u0159estali existovat a nezjist\u00ed, \u017ee se pouze p\u0159est\u011bhovali jinam.                                                                                                                                                                                                                                                                                                                                                                                        4.1\/5 - (9 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Jak funguje DNS server?","item":"https:\/\/www.web112.cz\/jak-funguje-dns-server\/#breadcrumbitem"}]}]