Chaque enregistrement est associé à un time for you to Stay (TTL) qui détermine combien de temps il peut être conservé dans un serveur cache. Ce temps est typiquement d'un jour (86400 s) mais peut être additionally élevé pour des informations qui changent rarement, comme des documents NS.
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Il n'est pas indispensable de disposer de serveurs secondaires, les serveurs émetteurs conservant les messages pendant un temps déterminé (typiquement, plusieurs jours) jusqu'à ce que le serveur primaire soit à nouveau disponible.
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Assuming the resolver has no cached data to accelerate the process, the resolution course of action starts off with a query to on the list of root servers. In usual operation, the foundation servers never remedy instantly, but react that has a referral to far more authoritative servers, e.
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each individual DNS zone must be assigned a list of authoritative name servers. This set of servers is saved during the mother or father domain zone with name server (NS) information.
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Une des failles mises en avant est la possibilité d'intercepter les paquets transmis. Les serveurs DNS communiquent au moyen de paquets uniques et non signés. Ces deux spécificités rendent l'interception très aisée.
expert services : décrit le provider de réécriture ; par exemple dans ENUM, la valeur de providers spécifie le form de l'URI résultante ; la sémantique précise de ce paramètre dépend également de l'software DDDS make use ofée ;
RDATA is facts of variety-certain relevance, like the IP tackle for address data, or maybe the precedence and hostname for MX information. popular document styles may possibly use label compression during the RDATA field, but "unfamiliar" document styles will have to not (RFC 3597).