{"id":2229,"date":"2022-02-23T10:54:02","date_gmt":"2022-02-23T07:54:02","guid":{"rendered":"http:\/\/turknetwp.local\/?p=2229"},"modified":"2024-01-15T12:29:12","modified_gmt":"2024-01-15T09:29:12","slug":"dns-nedir-nasil-calisir-ve-ne-ise-yarar","status":"publish","type":"post","link":"https:\/\/www.turk.net\/blog\/dns-nedir-nasil-calisir-ve-ne-ise-yarar\/","title":{"rendered":"DNS Nedir? Nas\u0131l \u00c7al\u0131\u015f\u0131r ve Ne \u0130\u015fe Yarar?"},"content":{"rendered":"<p><strong>DNS<\/strong> (\u0130ngilizce: Domain Name System, T\u00fcrk\u00e7e: <strong>Alan Ad\u0131 Sistemi<\/strong>), internet uzay\u0131n\u0131 b\u00f6l\u00fcmlemeye, b\u00f6l\u00fcmleri adland\u0131rmaya ve b\u00f6l\u00fcmler aras\u0131 ileti\u015fimi organize etmeye yarayan, bilgisayar, servis, internet veya \u00f6zel bir a\u011fa ba\u011fl\u0131 herhangi bir kaynak i\u00e7in hiyerar\u015fik da\u011f\u0131t\u0131lm\u0131\u015f bir adland\u0131rma sistemidir. Bu sebeple bu yaz\u0131m\u0131zda sizler i\u00e7in DNS Nedir? Nas\u0131l \u00e7al\u0131\u015f\u0131r ve ne i\u015fe yarar? Sorular\u0131n\u0131n cevaplar\u0131n\u0131 verdik.<\/p>\n<h2>DNS Nedir?<\/h2>\n<p>\u0130nternet a\u011f\u0131n\u0131 olu\u015fturan her birim sadece kendine ait bir IP adresine sahiptir. Bu IP adresleri kullan\u0131c\u0131lar\u0131n kullan\u0131m\u0131 i\u00e7in www.site_ismi.com gibi kolay hat\u0131rlan\u0131r adreslere kar\u015f\u0131l\u0131k d\u00fc\u015f\u00fcr\u00fcl\u00fcr. DNS sunucular\u0131, internet adreslerinin <a href=\"https:\/\/www.turk.net\/ip-adresi-sorgulama\" target=\"_blank\" rel=\"noopener\">IP adresi<\/a> kar\u015f\u0131l\u0131\u011f\u0131n\u0131 kay\u0131tl\u0131 tutmaktad\u0131r.<br \/>\nKat\u0131l\u0131mc\u0131 kurulu\u015flar\u0131n her birine atanm\u0131\u015f alan adlar\u0131 \u00e7e\u015fitli bilgileri ili\u015fkilendirir. En belirgin olarak, insanlar taraf\u0131ndan kolayca ezberlenebilen alan adlar\u0131n\u0131, d\u00fcnya \u00e7ap\u0131nda bilgisayar servisleri ve cihazlar i\u00e7in gerekli say\u0131sal IP adreslerine \u00e7evirir (d\u00f6n\u00fc\u015ft\u00fcr\u00fcr). DNS, \u00e7o\u011fu internet servisinin i\u015flevselli\u011fi i\u00e7in temel bir bile\u015fendir, \u00e7\u00fcnk\u00fc \u0130nternetin temel y\u00f6netici servisidir.<br \/>\n1970\u2019lerde ArpaNet g\u00fcn\u00fcm\u00fcz a\u011flar\u0131 ile kar\u015f\u0131la\u015ft\u0131r\u0131lamayacak kadar k\u00fc\u00e7\u00fck durumdayd\u0131 ve yaln\u0131zca birka\u00e7 y\u00fcz ile ifade edilebilen sisteme hizmet veriyordu. Bu tarihlerde isimlendirme i\u00e7in tek noktada tutulan bir dosyan\u0131n bulunmas\u0131 ve di\u011fer t\u00fcm sistemlerin bu dosyay\u0131 belli aral\u0131klarla kendi taraflar\u0131nda g\u00fcncellemesi isimlendirme sorununu \u00e7\u00f6zm\u00fc\u015ft\u00fcr.<br \/>\nAdres-isim tan\u0131mlamalar\u0131n\u0131 i\u00e7eren<strong> HOSTS.TXT<\/strong> dosyas\u0131 SRI taraf\u0131ndan SRI-NIC (Stanford Research Institute \u2013 Network Information Center) ad\u0131nda bir bilgisayar \u00fczerinde tutulmaktayd\u0131. Bu dosya her adrese bir isim kar\u015f\u0131l\u0131k gelecek \u015fekilde d\u00fczenlenmi\u015ftir. Arpanet \u00fczerindeki yeni isim tan\u0131mlamalar\u0131 ve de\u011fi\u015fiklikleri SRI\u2019ya g\u00f6nderilen e-postalar arac\u0131l\u0131\u011f\u0131 ile yap\u0131l\u0131yor ve <strong>HOSTS.TXT<\/strong>\u2019in kopyas\u0131 File Transfer Protocol ile al\u0131n\u0131yordu.<br \/>\nArpanet \u00fczerinde TCP\/IP kullan\u0131m\u0131na paralel olarak ortaya \u00e7\u0131kan ba\u011flant\u0131 patlamas\u0131, isim \u00e7\u00f6z\u00fcm\u00fc i\u00e7in bir\u00e7ok sunucuda ve her bilgisayara \u00f6zg\u00fcn bir isim atanmas\u0131nda problemler ya\u015fanmaktayd\u0131. Ayr\u0131ca yaln\u0131zca isim \u00e7\u00f6z\u00fcmlenmesi i\u00e7in olduk\u00e7a y\u00fcksek miktarda bant geni\u015fli\u011fi harcanmaktayd\u0131. Buna ra\u011fmen kullan\u0131lan isim veritabanlar\u0131n\u0131n uyumlu olmas\u0131 her zaman sa\u011flanamamaktayd\u0131.<br \/>\nBu durumun ortaya \u00e7\u0131kmas\u0131ndan sonra Arpanet daha \u00f6l\u00e7eklenebilir bir isim \u00e7\u00f6z\u00fcmleme yap\u0131s\u0131 i\u00e7in ara\u015ft\u0131rmalara ba\u015flad\u0131. Paul Mockapetris bu i\u015fle g\u00f6revlendirildi. Mockapetris 1984 y\u0131l\u0131nda Domain Name System (DNS)\u2019i tan\u0131mlayan RFC 882 ve RFC 883\u2019\u00fc yay\u0131nlad\u0131. Bunlar daha sonra h\u00e2len ge\u00e7erli olan RFC 1034 ve RFC 1035 taraf\u0131ndan g\u00fcncellendiler.<\/p>\n<h2><strong>DNS Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/strong><\/h2>\n<p>DNS, sunucu ve \u00e7\u00f6z\u00fcmleyici isimli fakt\u00f6rler aras\u0131nda \u00e7al\u0131\u015f\u0131r. Burada sunucular, IP adresi bilgilerini korurlar. \u00c7\u00f6z\u00fcmleyiciler ise DNS isterler. DNS veri taban\u0131na manuel bir \u015fekilde kay\u0131tlar girilir. Bunlar ilk \u00fclkelere sonra di\u011fer alt b\u00f6l\u00fcmlere ayr\u0131l\u0131rlar. T\u00fcrkiye i\u00e7in bu \u201ctr\u201d ve Birle\u015fik Krall\u0131k i\u00e7in \u201cuk\u201d gibi. Daha sonra bunlar top level domainlere ayr\u0131l\u0131rlar. \u00d6rne\u011fin; \u201c.com\u201d ticari kurulu\u015flar i\u00e7in, \u201c.gov\u201d h\u00fckumet kurulu\u015flar\u0131 i\u00e7in, \u201c.edu\u201d e\u011fitim kurumlar\u0131 i\u00e7in alt b\u00f6l\u00fcmlerdir. ABD hari\u00e7 b\u00fct\u00fcn \u00fclkelerin kendi kodu vard\u0131r ve alt alanlar o kod ile bitmektedirler. ABD bu sistemin mucidi \u00fclke oldu\u011fu i\u00e7in o, \u00fclke kodu kullanmaz. T\u00fcrkiye\u2019de bir h\u00fckumet kurulu\u015fu \u201c.gov.tr\u201d \u015feklinde biter. Her \u00fclke kendi ISO3166 kodu ile bitirir. Yani alan adlar\u0131n\u0131n belli bir kural\u0131 vard\u0131r, isteyen istedi\u011fi alan ad\u0131n\u0131 alamaz.<\/p>\n<h2><strong>DNS Nas\u0131l ve Neden De\u011fi\u015ftirilir?<\/strong><\/h2>\n<p>Bazen mevcut olan DNS ayarlar\u0131n\u0131z ile internet \u00fczerinde bulunan her siteye giremeyebilirsiniz. Bu gibi durumlarda da DNS de\u011fi\u015ftirmek isteyebilirsiniz. Bu de\u011fi\u015ftirme i\u015flemini DNS kay\u0131tlar\u0131ndan yapabilirsiniz fakat Android, Windows ve IOS i\u00e7in DNS de\u011fi\u015ftirme i\u015flemleri birbirlerinden farkl\u0131d\u0131rlar. Bu de\u011fi\u015ftirme ile bilgisayar\u0131n\u0131z\u0131n ya da telefonunuzun DNS\u2019ini de\u011fi\u015ftirirsiniz. DNS de\u011fi\u015ftirmenin bir di\u011fer sebebi de h\u0131z ve g\u00fcvenli\u011fi art\u0131rmakt\u0131r. B\u00f6ylece daha h\u0131zl\u0131 ve g\u00fcvenli bir internet ba\u011flant\u0131s\u0131 elde edebilirsiniz. Bir ba\u015fka sebep ise istenmeyen i\u00e7eriklerin engellenmesidir. DNS kay\u0131tlar\u0131 ile adult i\u00e7erikleri engelleyebilirsiniz. Ayr\u0131ca T\u00fcrkiye\u2019de zaman zaman BTK, DNS \u00fczerinden baz\u0131 internet sitelerine eri\u015fimi mahkeme karar\u0131 ile engellenebilir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DNS (\u0130ngilizce: Domain Name System, T\u00fcrk\u00e7e: Alan Ad\u0131 Sistemi), internet uzay\u0131n\u0131 b\u00f6l\u00fcmlemeye, b\u00f6l\u00fcmleri adland\u0131rmaya ve b\u00f6l\u00fcmler aras\u0131 ileti\u015fimi organize etmeye yarayan, bilgisayar, servis, internet veya \u00f6zel bir a\u011fa ba\u011fl\u0131 herhangi bir kaynak i\u00e7in hiyerar\u015fik da\u011f\u0131t\u0131lm\u0131\u015f bir adland\u0131rma sistemidir. Bu sebeple bu yaz\u0131m\u0131zda sizler i\u00e7in DNS Nedir? Nas\u0131l \u00e7al\u0131\u015f\u0131r ve ne i\u015fe yarar? Sorular\u0131n\u0131n cevaplar\u0131n\u0131 verdik. [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":4681,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-2229","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internet-terimleri"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>DNS Nedir? Nas\u0131l \u00c7al\u0131\u015f\u0131r ve Ne \u0130\u015fe Yarar? - Turknet Blog<\/title>\n<meta name=\"description\" content=\"DNS nedir? Nas\u0131l \u00e7al\u0131\u015f\u0131r ve de\u011fi\u015ftirilir? 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