Retry : le délai en secondes que doivent attendre le serveur secondaire ou les serveurs esclaves lorsque leur précédente requête a échoué ;
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in almost any occasion, the name server Hence queried will observe the procedure outlined over, until finally it either efficiently finds a click here end result or isn't going to. It then returns its outcomes into the DNS resolver; assuming it has identified a final result, the resolver duly caches that outcome for future use, and hands the result back to your software package which initiated the ask for.
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An authoritative name server can possibly be considered a Most important server or even a secondary server. Historically the terms learn/slave and primary/secondary had been often used interchangeably[29] but The existing practice is to utilize the latter type.
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Pour éviter les factors individuels de défaillance, on évite de partager l'infrastructure entre les serveurs qui font autorité. Un serveur secondaire sera de préfileérence délocalisé et routé différemment du serveur primaire.
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Il est également achievable d'indiquer que des informations ne doivent pas être mises en cache en spécifiant un TTL de zéro.
solutions : décrit le assistance de réécriture ; par exemple dans ENUM, la valeur de expert services spécifie le sort de l'URI résultante ; la sémantique précise de ce paramètre dépend également de l'application DDDS useée ;
g., a question for "" is referred for the org servers. The resolver now queries the servers referred to, and iteratively repeats this process until finally it receives an authoritative solution. The diagram illustrates this method for the host that is certainly named because of the fully experienced domain name "".