Topic starter
DNS stands for Domain Name System, and it functions as the phonebook of the internet. It translates human-friendly domain names, like www.example.com, into IP addresses, such as 192.0.2.1, which computers use to communicate with each other.
How DNS works:
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You type a domain name (e.g.,
www.example.com) into your browser. -
Your computer checks its local DNS cache to see if it has the IP address already stored. If not:
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DNS Resolver (typically provided by your ISP) looks up the IP address by asking a series of DNS servers:
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Root DNS servers: Directs the query to the relevant Top-Level Domain (TLD) DNS servers (e.g.,
.com,.org). -
TLD DNS servers: Directs the query to the Authoritative DNS servers for the domain.
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Authoritative DNS servers: Finally, they provide the actual IP address for the requested domain.
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The DNS resolver returns the IP address to your computer, and your browser can now connect to the server hosting the website.
Key Concepts:
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A Record: Maps a domain name to an IP address.
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MX Record: Specifies the mail servers for a domain.
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CNAME Record: Allows an alias to point to another domain name.
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TTL (Time to Live): Specifies how long a DNS record is cached.
Posted : 08/04/2025 5:41 pm
