{"id":105,"date":"2016-01-26T20:33:39","date_gmt":"2016-01-26T19:33:39","guid":{"rendered":"http:\/\/www.webhostingsrbija.rs\/?p=105"},"modified":"2016-01-26T20:33:39","modified_gmt":"2016-01-26T19:33:39","slug":"sta-je-dns","status":"publish","type":"post","link":"https:\/\/www.webhostingsrbija.rs\/en\/sta-je-dns\/","title":{"rendered":"What is DNS?"},"content":{"rendered":"<p>DNS zone su veoma va\u017ean koncept u DNS infrastrukturi, po\u0161to omogu\u0107avaju DNS domenima da budu logi\u010dki odvojeni i da njima mo\u017ee upravljati. Ova lekcija nudi osnovu za razumevanje na\u010dina na koje su zone povezane sa DNS domenima i informacije o razli\u010ditim tipovima DNS zona koje su dostupne u Windows Server 2008 DNS ulozi.<\/p>\n<h3><strong>\u0160ta je DNS zona?<\/strong><\/h3>\n<p>DNS zona hostuje sve ili samo jedan deo domena i njegove poddomene. Slede\u0107i slajd ilustruje kako poddomeni mogu da pripadaju istoj zoni kao i njihovi roditelji ili kako mogu biti delegirani u drugoj zoni. Microsoft.com domen je podeljen na dve zone. Prva zona hostuje <a href=\"http:\/\/www.microsoft.com\/\" target=\"_blank\" rel=\"noopener\">www.microsoft.com<\/a> i <a href=\"ftp:\/\/ftp.microsoft.com\/\" target=\"_blank\" rel=\"noopener\">ftp.microsoft.com<\/a>. Example.microsoft.com je delegiran unutar nove zone koja hostuje example.microsoft.com i njegove poddomene<a href=\"ftp:\/\/ftp.example.microsoft.com\/\" target=\"_blank\" rel=\"noopener\">ftp.example.microsoft.com<\/a> i <a href=\"http:\/\/www.example.microsoft.com\/\" target=\"_blank\" rel=\"noopener\">www.example.microsoft.com<\/a>.<\/p>\n<p>&nbsp;<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/www.link-elearning.com\/linkdl\/coursefiles\/327\/6421_06_01.jpg\" alt=\"\" width=\"606\" height=\"367\" title=\"\"><\/p>\n<p>&nbsp;<\/p>\n<p>Va\u017eno: zona koja hostuje Root domen (Microsoft.com) mora da delegira example.microsoft.com na drugu zonu. Ako se ovo ne odradi, example.microsoft.com \u0107e biti tretiran kao deo prve zone.<\/p>\n<p>Zonski podaci mogu da se repliciraju na vi\u0161e od jednog servera \u0161to dodaje redudantnost iz razloga \u0161to informacije koje su potrebne za pronala\u017eenje resursa u zoni sada postoje na dva servera. Nivo redundantnosti koji nam je potreban je dovoljan razlog za kreiranje zona. Ako imamo zonu u kojoj su definisani kriti\u010dni serveri, najverovatnije da \u0107e ta zona imati vi\u0161i nivo redundantnosti od zone u kojoj kriti\u010dni serveri nisu definisani.<\/p>\n<p>Zona mo\u017ee da dr\u017ei zapise za jedan domen ili mo\u017ee da dr\u017ei zapise vi\u0161e domena. Zone mogu da hostuju vi\u0161e od jednog domena samo ako su domeni povezani sa direktnom Parent-Child (roditelj-dete) vezom.<\/p>\n<p>Zona je tako\u0111e fizi\u010dko prikazivanje jednog ili vi\u0161e DNS domena. Na primer, ako imamo DNS domen adresni prostor prodaja.linkgroup.com, mo\u017eemo da kreiramo zonu na DNS serveru prodaja.linkgroup.com i ova zona mo\u017ee da sadr\u017ei sve zapise (Resources Records) koji se nalaze u linkgroup domenu.<\/p>\n<p>DNS dozvoljava da DNS adresni prostor bude podeljen u zone. Za svako DNS domensko ime koje je uklju\u010deno u zonu, zona postaje autoritativni izvor za informacije koje se odnose na taj domen.<\/p>\n<p>Zonski fajlovi se odr\u017eavaju na DNS serverima. Mo\u017eemo da konfiguri\u0161emo jedan DNS server da hostuje nijednu, jednu ili vi\u0161e zona. Svaka zona mo\u017ee da bude autoritativna za jedan ili vi\u0161e od jednog DNS domena. Zone mogu da se sme\u0161taju ili u tekstualnim fajlovima i u bazi aktivnog direktorijuma.<\/p>\n<p>Karakteristike zona uklju\u010duju slede\u0107e:<\/p>\n<ul>\n<ul>\n<li>Zona je kolekcija prevoda (Host ime u IP adresu) za sve hostove u DNS adresnom prostoru.<\/li>\n<\/ul>\n<\/ul>\n<ul>\n<ul>\n<li>Zonski podaci se odr\u017eavaju na DNS serveru i sme\u0161taju se na jedan od ova dva na\u010dina: kao zonski tekstualni fajl koji sadr\u017ei listu prevoda; u bazi aktivnog direktorijuma.<\/li>\n<\/ul>\n<\/ul>\n<ul>\n<ul>\n<li>DNS server je autoritativan DNS server za zonu ako u zonskom fajlu hostuje zapise za imena i adrese koje zahtevaju klijenti.<\/li>\n<\/ul>\n<\/ul>\n<p>Koriste\u0107i razli\u010dite zone, mo\u017eemo da konfiguri\u0161emo na\u0161u DNS soluciju da na najbolji na\u010din ispunjava potrebe na\u0161e organizacije. Na primer, preporu\u010duje se da konfiguri\u0161emo primarnu zonu i sekundarnu zonu na razli\u010ditim serverima, da bismo imali otpornost na gre\u0161ke ako jedan od ta dva servera prestane sa normalnim radom. Mo\u017eemo da konfiguri\u0161emo Stub zonu ako se zona odr\u017eava na odvojenom DNS serveru.<\/p>\n<p><strong>Primarna zona<\/strong>: primarna zona je autoritativna kopija DNS zone, u kojoj se kreiraju i odr\u017eavaju zapisi (Resouces Records). Kada pode\u0161avamo DNS servere da hostuju zonu za domen, primarni server normalno se nalazi na mre\u017ei i pristupa\u010dan je za administraciju zonskog fajla.<\/p>\n<p><strong>Sekundarna zona<\/strong>: sekundarna zona je kopija DNS zone koja sadr\u017ei kopiju zapisa, i na njoj se ne mogu vr\u0161iti izmene ve\u0107 samo \u010ditanje. Zapisi u sekundarnoj zoni ne mogu da se menjaju i bri\u0161u; administratori mogu da menjaju i bri\u0161u zapise samo u primarnoj zoni. Barem jedna sekundarna zona se konfiguri\u0161e kada \u017eelimo da omogu\u0107imo toleranciju na gre\u0161ke (Fault Tolerance). Ipak, vi\u0161e sekundarnih servera mogu da budu konfigurisani na drugim lokacijama tako da zapisi iz zone mogu da budu razre\u0161eni bez kori\u0161\u0107enja skupih WAN linkova.<\/p>\n<p><strong>Stub zona<\/strong>: stub zone su kopije koje sadr\u017ee samo zapise koji su potrebni za identifikaciju autoritativnog DNS servera za tu zonu. Stub zona sadr\u017ei slede\u0107e zonske podatke: SOA, NS &amp; A zapise. Stub zona je kao pokazatelj koji jednostavno pokazuje koji DNS server je autoritativan za zonu. Stub zone mogu da se iskoriste kada Root Hintovi ukazuju na Interni DNS server, a ne na Root servere na internetu. Iz sigurnosnih razloga, DNS server je dizajniran da razre\u0161ava samo odre\u0111ene zone.<\/p>\n<p><strong>AD-integrisana zona<\/strong>: AD-Integrisane zone karakteri\u0161u dve osnovne prednosti: Multimaster zonska replikacija, kao i \u010dinjenica da se proces DDNS (dinami\u010dkog DNS-a) registracije sada odlikuje kako izbalansiranim optere\u0107enjem, tako i zadovoljavaju\u0107im stepenom bezbednosti. Ipak, ove zone imaju i svojih nedostataka: one se donekle udaljavaju od onoga \u0161to je propisano RFC dokumentima za DNS. Pored toga, sve kontrolere domena moramo da pretvorimo i u DNS servere. Kada konfiguri\u0161emo domenski kontroler, aktivni direktorijum zahteva instalaciju DNS servisa. Zone koje su kreirane na DNS serveru koji je i domenski kontroler u aktivnom direktorijumu mogu da budu AD-integrisane DNS zone.<\/p>\n<p>AD-integrisane DNS zone imaju nekoliko prednosti u pore\u0111enju sa obi\u010dnim zonama (primarnim, sekundarnim i stub). AD-integrisane zone mogu da koriste aktivni direktorijum:<\/p>\n<ul>\n<ul>\n<li>da smeste zonske konfiguracione podatke u aktivnom direktorijumu, umesto da zonski konfiguracioni podaci budu sme\u0161teni u zonskom fajlu<\/li>\n<\/ul>\n<\/ul>\n<ul>\n<ul>\n<li>koristi Active Directory Replication umesto zonskog transfera<\/li>\n<\/ul>\n<\/ul>\n<ul>\n<ul>\n<li>dozvoljava samo sigurno dinami\u010dko a\u017euriranje (umesto sigurnog i nesigurnog a\u017euriranja na obi\u010dnoj primarnoj DNS zoni).<\/li>\n<\/ul>\n<\/ul>\n<h3><strong>\u0160ta su to Forward i Reverse Lookup zone<\/strong><\/h3>\n<p><strong>\u0160ta su to Forward i Reverse Lookup zone:<\/strong> nakon \u0161to smo odlu\u010dili da li \u0107e na\u0161a zona biti primarna, sekundarna ili stub zona, moramo da odlu\u010dimo tip Lookup zone u koji \u0107e biti sme\u0161teni zapisi. Zapisi mogu da se smeste ili u Forward Lookup zonu ili u Reverse Lookup zonu. Forward Lookup zone razre\u0161avaju host imena u IP adrese i hostuju naj\u010de\u0161\u0107e slede\u0107e zapise: A, CNAMES, SRV, MX, SOA, NS. Reverse Lookup zone razre\u0161avaju IP adrese u domen imena i hostuju SOA, NS &amp; PTR zapise.<\/p>\n<p>Administratori mogu da sme\u0161taju prevode (host ime u IP adresu) koji \u0107e prevoditi host ime u IP adresu ili IP adresu u host ime. Mo\u017eemo da izaberemo tip prevo\u0111enja koji nam je potreban za zonu, u zavisnosti od toga kako \u017eelimo da na\u0161i klijenti i servisi \u0161alju zahteve za zapisima u DNS zoni.<\/p>\n<p><strong>Forward Lookup zone<\/strong>: u DNS-u, forward lookup je upitni proces u kojem se Display ime za DNS Domen host kompjutera pretra\u017euje da bi se prona\u0161la odgovaraju\u0107a IP adresa. U DNS Manager-u, forward lookup zone se zasnivaju na DNS domenskim imenima i tipi\u010dno sadr\u017ei Host Address (A) zapise.<\/p>\n<p><strong>Reverse Lookup zone<\/strong>: u DNS-u, reverse lookup je upitni proces\u00a0 u kojem se IP adresa host kompjutera pretra\u017euje da bi se prona\u0161lo odgovaraju\u0107e Display ime za DNS domen. U DNS Manager-u, Reverse Lookup zone se zanivaju na in-addr.arpa domenskom imenu i tipi\u010dno sadr\u017ee PTR zapise.<\/p>\n<p>Na slici dole vidimo \u0161ta su to Reverse i Forward Lookup zone:<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.link-elearning.com\/linkdl\/coursefiles\/327\/6421_06_02.jpg\" alt=\"\" width=\"592\" height=\"317\" title=\"\"><\/p>\n<h3><strong>\u0160ta su to stub zone<\/strong><\/h3>\n<p>Stub zona je kopija zone koja sadr\u017ei samo one zapise resursa koji su potrebni da bi mogli da se identifikuju autoritativni DNS serveri za tu zonu. Stub zona razre\u0161ava imena izme\u0111u odvojenih DNS adresnih prostora, \u0161to mo\u017ee da bude neophodno kada dve kompanije koje se integri\u0161u (sjedinjuju) zahtevaju da DNS serveri za dva odvojena DNS adresna prostora razre\u0161avaju imena za klijente u oba adresna prostora.<\/p>\n<h3><strong>Delegiranje DNS zona (DNS Zone Delegation)<\/strong><\/h3>\n<p>DNS je hijerarhijski sistem i delegiranje zona konektuje DNS slojeve zajedno. Zone Delegation (delegiranje zona) ukazuje na slede\u0107i hijerarhijski nivo ispod i identifikuje Name servere (NS) koji su odgovorni za Lower-level domen. DNS nudi opciju kojom mo\u017eemo da podelimo adresni prostor na jednu ili vi\u0161e zona, u koje nakon toga mo\u017eemo da smestimo, distribuiramo i repliciramo na druge DNS servere.<\/p>\n<p>Kada odlu\u010dujemo da li da podelimo DNS adresni prostor (Namespace) i napravimo dodatne zone, potrebno je da obratimo pa\u017enju na slede\u0107e razloge kori\u0161\u0107enja dodanih zona:<\/p>\n<ul>\n<ul>\n<li>Potreba za delegiranjem upravljanja dela DNS adresnog prostora na drugu lokaciju ili drugo odeljenje unutar organizacije.<\/li>\n<\/ul>\n<\/ul>\n<ul>\n<ul>\n<li>Potreba za deljenjem jedne velike zone na manje zone za distribuiranje optere\u0107enja saobra\u0107aja izme\u0111u vi\u0161e servera \u0161to pobolj\u0161ava performansu DNS razre\u0161avanje imena (Name-resolution) i kreira DNS okru\u017eenje koje je otporno na gre\u0161ke (Fault Tolerance).<\/li>\n<\/ul>\n<\/ul>\n<ul>\n<li>Potreba za pro\u0161irenjem adresnog prostora dodavanjem mnogobrojnih poddona odjednom da bi 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