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When a DNS query is received, it will search in its cache memory for the host address tied to the IP address from the DNS query.
If the recursive name server has the information, then it will return a response to query sender.
For a more profound understanding let’s break down the previously mentioned DNS components that are relevant to the DNS lookup process.
Authoritative DNS Server An authoritative name server is a DNS server that stores DNS records (A, CNAME, MX, TXT, etc.) for domain names.
A DNS zone forms one part of the DNS namespace delegated to administrators or specific entities.
Each zone contains the resource records for all of its domain names.
The Recursive DNS server accesses the A record for the authoritative name servers and stores the record in its local DNS cache.
If other DNS queries request the A record for the recursive server will have the answer and will not have to repeat the DNS lookup process.
It is mandatory for the zone file to have the TTL (Time to Live) listed before any other information.If the domain is cached, the DNS query will end here and the website displayed to the user.Step 3: Query the Authoritative DNS Servers If a recursive DNS server or servers do not have the information stored in its cache memory, the DNS query continues to the authoritative DNS server that has the data for a specific domain.Step 5: Final DNS Step The Recursive DNS server has the information and returns the A record to your computer.Your computer will store the DNS record in its local DNS cache, will read the IP address from the DNS record, and pass this information to your browser.