Les serveurs racine sont gérés par douze organisations différentes : deux sont européennes, une japonaise et les neuf autres sont américaines. Sept de ces serveurs sont en réalité distribués dans le monde grâce à la technique anycast et neuf disposent d'une adresse IPv6[21].
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NAPTR history ou Name Authority Pointer report qui donne accès à des règles de réécriture de l'information, permettant des correspondances assez lâches entre un nom de domaine et une ressource. Il est spécifié dans la RFC 3403[28] ;
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This is particularly real in mail addressing [Quarterman 86]. two.2. DNS structure plans the look goals of the DNS impact its structure. These are: - the first goal is check here a regular name Room that will be useful for referring to resources. to be able to stay away from the issues because of advertisement hoc encodings, names shouldn't be necessary to have network identifiers, addresses, routes, or similar details as part of the name.
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Il suffit, à ce instant, qu'un pirate informatique réponde à la requête de l'utilisateur avant le serveur DNS pour que l'utilisateur se retrouve sur un web site d'hameçonnage.
Les délégations des zones inverses se font sur une frontière d'octet, ce qui fonctionne quand les blocs d'adresses sont distribués de façon classful mais pose des problèmes quand les blocs assignés sont de taille quelconque.
Les paquets des serveurs DNS étant faiblement sécurisés, authentifiés par un numéro de requête, il est feasible de fabriquer de faux paquets. Par exemple, un utilisateur qui souhaite accéder au web-site fait une demande au website DNS.
UDP reserves port quantity 53 for servers Hearing queries.[five] this kind of queries encompass a clear-textual content ask for despatched in just one UDP packet with the client, responded to with a transparent-text reply sent in just one UDP packet in the server. in the event the length of the answer exceeds 512 bytes and equally customer and server help Extension Mechanisms for DNS (EDNS), much larger UDP packets could possibly be made use of.[forty three] Use of DNS about UDP is proscribed by, among the other issues, its lack of transport-layer encryption, authentication, trustworthy delivery, and concept duration.
this issue, called the IDN homograph assault, is acute in techniques that assist internationalized domain names, as many character codes in ISO 10646 may seem identical on standard Personal computer screens. This vulnerability is at times exploited in phishing.[fifty four]
DNS serves other purposes In combination with translating names to IP addresses. As an example, mail transfer agents use DNS to locate the best mail server to provide e-mail: An MX report gives a mapping involving a domain along with a mail exchanger; this can provide an additional layer of fault tolerance and load distribution.