Shulou(Shulou.com)06/01 Report--

Common DNS records

SOA: Domain Authority Start

NS: authoritative domain name server

A: Host address

CNAME: The proper name of the alias

MX: Mail Delivery Server

PTR: Domain name pointer (for reverse DNS)

query process

Browser Cache->Hosts->LDNS->LDNS Cache->ISP->ISP Cache-> Root Server

Recursive/iterative queries

DNS and LDNS are usually iterative queries, LDNS has become a small errand boy, *** service

LDNS and public network authority DNS is usually recursive, high official: I don't know, this should be the work of Dumby, you go to Dumby

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