How does DNS work

System Design
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Any one knows how DNS works?

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This is a good article What is DNS: How it Works and Domain Name System Vulnerabilities | Varonis
@KT327 feel free to ask any questions.

Key things are

  1. You can have multiple ip’s associated with a DNS - this allows us to provide redundancy and load balancing
  2. DNS is a like a network where each DNS server has the capability to ask another server , if it does not know how to resolve the domain name.
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How DNS works
How DNS works1938×1059 168 KB

Thank you I have answers to few of my questions that I have written in BLUE, I still have open questions can you please address ?

1 Like
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This article provides the answer when DNS uses TCP Is DNS TCP or UDP port 53? - Infoblox

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The root server configuration can be understood here https://www.cloudflare.com/learning/dns/glossary/dns-root-server/ - but at a high level there is a lot of redundancy. Read about AnyCast to understand that
@KT327

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@KT327 for question 4, yes Amazon owns their own Authoritative DNS severs, for smaller sites namecheap.com, godaddy.com provide that service. Amazon Route53 can also be used.

@sandeshpande what are your thoughts?