Parvej Husen Talukder: Created page with "'''Domain Name System''' ('''DNS''') is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It translates human-readable domain names (e.g., ''www.example.com'') into numerical IP addresses (e.g., ''192.0.2.1'') required for locating and identifying devices on a network.{{Cite web |title=What is DNS? |url=https://www.cloudflare.com/learning/dns/what-is-dns/ |access-date=2024-1..."

2024-12-13T17:39:30Z

Created page with "'''Domain Name System''' ('''DNS''') is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It translates human-readable domain names (e.g., ''www.example.com'') into numerical IP addresses (e.g., ''192.0.2.1'') required for locating and identifying devices on a network.<ref>{{Cite web |title=What is DNS? |url=https://www.cloudflare.com/learning/dns/what-is-dns/ |access-date=2024-1..."

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'''Domain Name System''' ('''DNS''') is a hierarchical and decentralized naming system for computers, services, or other resources connected to the [[Internet]] or a private network. It translates human-readable domain names (e.g., ''www.example.com'') into numerical IP addresses (e.g., ''192.0.2.1'') required for locating and identifying devices on a network.<ref>{{Cite web |title=What is DNS? |url=https://www.cloudflare.com/learning/dns/what-is-dns/ |access-date=2024-12-13 |website=Cloudflare}}</ref>

== History ==
* '''1983''': The DNS was designed by [[Paul Mockapetris]], replacing the earlier [[hosts.txt]] file system.<ref>{{Cite web |title=History of DNS |url=https://www.internetsociety.org/resources/doc/2013/internet-dns/ |access-date=2024-12-13 |website=Internet Society}}</ref>
* '''1984''': The first implementation of DNS was introduced through the ''Berkeley Internet Name Domain'' (BIND) software.

== Functionality ==
The DNS performs the following key tasks:
* '''Name Resolution''': Converts domain names into IP addresses.
* '''Load Distribution''': Allows traffic to be spread across multiple servers using techniques like [[round-robin DNS]].
* '''Email Routing''': Facilitates email delivery using [[MX record]]s.

== Structure ==
The DNS system is structured as a hierarchy:
* '''Root Zone''': The top level of the DNS hierarchy, managed by [[ICANN]].<ref>{{Cite web |title=DNS Root Zone |url=https://www.icann.org/resources/pages/root-2012-02-25-en |access-date=2024-12-13 |website=ICANN}}</ref>
* '''Top-Level Domains (TLDs)''': These include generic TLDs (e.g., [[.com]], [[.org]]) and country-code TLDs (e.g., [[.uk]], [[.jp]]).
* '''Second-Level Domains''': Domains directly under TLDs (e.g., ''example.com'').
* '''Subdomains''': Domains under second-level domains (e.g., ''support.example.com'').

== Key DNS Records ==
DNS uses several types of records to manage domain information:
* '''A Record''': Maps a domain to an IPv4 address.
* '''AAAA Record''': Maps a domain to an IPv6 address.
* '''MX Record''': Specifies mail servers for email delivery.
* '''CNAME Record''': Maps a domain to another domain.
* '''TXT Record''': Allows text information to be associated with a domain, often for verification or security purposes.

== DNS Servers ==
* '''Authoritative DNS Servers''': Provide answers for specific domains they are responsible for.
* '''Recursive DNS Resolvers''': Query other servers to resolve a domain name for a client.
* '''Root Servers''': Handle requests for TLDs and redirect them to the appropriate authoritative servers.

== Security ==
* '''DNSSEC''' (Domain Name System Security Extensions): Adds a layer of security to DNS by authenticating responses.
* '''DNS Spoofing''' and '''Cache Poisoning''': Common security threats that redirect users to malicious websites.

== Applications ==
DNS is fundamental to internet functionality, supporting:
* Web browsing by resolving domain names.
* Email systems via mail servers.
* Network services like [[CDN]]s and [[IoT]] devices.

== Criticism and Challenges ==
* DNS servers are vulnerable to [[Distributed Denial of Service (DDoS)]] attacks.
* Centralization concerns arise due to the reliance on a limited number of root servers and key organizations.

== Future of DNS ==
Emerging technologies such as [[DNS over HTTPS]] (DoH) and [[DNS over TLS]] (DoT) aim to enhance privacy and security by encrypting DNS queries.<ref>{{Cite web |title=DNS Encryption |url=https://developers.google.com/speed/public-dns/docs/doh |access-date=2024-12-13 |website=Google Public DNS}}</ref>

== See Also ==
* [[IP Address]]
* [[Top-Level Domain (TLD)]]
* [[DNSSEC]]
* [[ICANN]]

== References ==
<references />

== External Links ==
* [https://www.icann.org/resources/pages/dns Internet Corporation for Assigned Names and Numbers (ICANN) - About DNS]
* [https://www.iana.org/domains/root IANA - Root Zone Management]

[[Category:Internet architecture]]
[[Category:Internet protocols]]
[[Category:Domain Name System]]
{{SHORTDESC:Hierarchical and decentralized system for resolving domain names}}

Domain Name System - Revision history