The Domain Name System (DNS) is a hierarchical and decentralized naming system used to translate human-friendly domain names (like www.example.com) into IP addresses (like 192.0.2.1) that computers use to identify each other on the network. DNS operates as a directory that maintains the relationship between domain names and their corresponding IP addresses.
Key Functions of DNS:
- Domain Name Resolution: The primary function of DNS is to resolve domain names into IP addresses so that browsers can load Internet resources.
- Domain Name Delegation: DNS enables the delegation of domain names, allowing different parts of the internet to be managed by different organizations.
- Load Distribution: DNS can help distribute the load of incoming traffic across multiple servers.
- Email Routing: DNS records can specify which mail servers are responsible for receiving emails on behalf of a domain.
DNS Records
- A Record: Maps a domain to an IP address.
- CNAME Record: Maps a domain to another domain (canonical name).
- MX Record: Identifies mail exchange servers for a domain.
- NS Record: Indicates the name servers for a domain.
Helpful Resources for Understanding DNS:
Here are some non-commercial resources to help you understand DNS better:
- ICANN: Domain Name System
- How DNS Works – Cloudflare
- Introduction to DNS – DNS Made Easy
- What is the Domain Name System? – Google Cloud
- Introduction to DNS Records – DigitalOcean
Make sure to explore these resources for a more comprehensive understanding of DNS and its functionalities.
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