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Bien que cela soit techniquement possible, on évite de mêler sur un même serveur le rôle de DNS récursif et celui de serveur qui fait autorité.
il n'y a pas de garantie de confidentialité, c'est-à-dire que ce service pourrait déterminer à quels domaines un utilisateur a accès en conservant des traces des requêtes DNS.
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This TTL is decided from the administrator of your authoritative DNS server and may range between several seconds to quite a few days or maybe months.[33]
Si une réponse dépasse cette taille, la norme prévoit que la requête doit être renvoyée sur le port TCP 53. Ce cas est cependant unusual et évité, et les firewalls bloquent souvent le port TCP 53.
useful resource information of the same kind are called a source history set (RRset), obtaining no Unique purchasing. DNS resolvers return your complete established upon query, but servers might carry out round-robin purchasing to attain load balancing. In contrast, the Domain Name method Security Extensions (DNSSEC) work on the complete set of source file in canonical order.
La trahison par un serveur, ou corruption de données, est, techniquement, identique à une interception des paquets. La seule différence venant du fait que l'utilisateur envoie volontairement sa requête au serveur.
Despite the fact that no technical limitation exists to stop domain name labels from applying any character that is definitely representable by an octet, hostnames utilize a chosen structure and character established. The figures allowed in labels really are a subset with the ASCII character set, consisting of check here figures a through z, A as a result of Z, digits 0 through 9, and hyphen.
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The tree sub-divides into zones starting at the foundation zone. A DNS zone may perhaps include as quite a few domains and subdomains because the zone manager chooses. DNS can even be partitioned In keeping with class in which the independent classes could be regarded as an array of parallel namespace trees.[twenty five]
The dilemma area has a simpler format compared to the source history format Utilized in another sections. Each and every query history (there is normally only one during the portion) is made up of the subsequent fields: useful resource history (RR) fields
The DNS can be promptly and transparently up-to-date, enabling a provider's site over the community to change with out affecting the end users, who go on to work with the same hostname. buyers take advantage of this once they use meaningful Uniform source Locators (URLs) and e-mail addresses without needing to understand how the computer essentially locates the products and services.