DNS Fundamentals

DNS é um sistema distribuído, hierárquico e orientado a cache

This section organizes the essential concepts, implementation decisions, validation points and troubleshooting checks related to this topic. Use version-specific vendor documentation before applying changes in production.

Anatomia de uma mensagem DNS

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Raiz, TLD, domínio e zonas

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Recursão e iteração são comportamentos diferentes

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RRset é a unidade lógica do DNS

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TTL é validade do RRset em cache

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NXDOMAIN e NODATA também podem ser armazenados

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DNS clássico precisa de UDP e TCP

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Extensões, tamanho UDP e problemas de caminho

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RCODE, NODATA e Extended DNS Errors

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IPv4 usa in-addr.arpa; IPv6 usa ip6.arpa

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Ferramentas que um NOC precisa dominar

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Flow mínimo antes de mudar configuration

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Exercício: prove cada camada

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Base normativa

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