{"id":179543,"date":"2024-04-09T17:12:58","date_gmt":"2024-04-09T16:12:58","guid":{"rendered":"https:\/\/datascientest.com\/en\/?p=179543"},"modified":"2024-02-22T20:27:06","modified_gmt":"2024-02-22T19:27:06","slug":"decoding-dns-exploring-the-domain-name-system-and-its-functions","status":"publish","type":"post","link":"https:\/\/datascientest.com\/en\/decoding-dns-exploring-the-domain-name-system-and-its-functions","title":{"rendered":"Decoding DNS: Exploring the Domain Name System and Its Functions"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"179543\" class=\"elementor elementor-179543\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8c2ccd5 e-flex e-con-boxed e-con\" data-id=\"8c2ccd5\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d60e69c elementor-widget elementor-widget-heading\" data-id=\"d60e69c\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-default\">The Domain Name System (DNS) is one of the key elements enabling the Internet to function. Like a virtual telephone directory, it converts domain names into IP addresses to enable Internet users to access sites. Find out everything you need to know about this system and its importance in Data Science!\n<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f51170e elementor-widget elementor-widget-text-editor\" data-id=\"f51170e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>In the <a href=\"https:\/\/datascientest.com\/en\/internet-searches-will-change-forever-with-googles-magi\"><strong>early days of the Internet<\/strong><\/a>, to access a website, it was necessary to memorize its IP address. It soon became clear that a simpler alternative was needed.<\/p><p>To solve this problem, in 1983 Paul Mockapetris came up with the idea of creating a kind of virtual directory where each domain name would be associated with a corresponding IP address: <strong>DNS.<\/strong><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c4edb94 e-flex e-con-boxed e-con\" data-id=\"c4edb94\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-40a07ef elementor-widget elementor-widget-heading\" data-id=\"40a07ef\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">What is DNS?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-22f709f elementor-widget elementor-widget-text-editor\" data-id=\"22f709f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>The <strong>Domain Name System (DNS)<\/strong> is a hierarchical domain name system that translates domain names into <strong>numerical IP addresses.<\/strong><\/p><p>It provides the link between familiar domain names such as &#8220;www.exemple.com&#8221; and unique IP addresses such as &#8220;192.168.0.1&#8221;, which identify servers and computers on the Internet.<\/p><p>The system is based on a hierarchy of servers. When a user enters a domain name into his or her browser, the <strong>browser sends a DNS query to the local DNS server<\/strong> (also known as the resolver). If the resolver already has the answer in its cache, it returns it directly to the user. If it doesn&#8217;t, it begins the DNS resolution process, querying DNS servers higher and higher in the hierarchy until it obtains the appropriate response.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2fbdb0a e-flex e-con-boxed e-con\" data-id=\"2fbdb0a\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3daff13 elementor-widget elementor-widget-heading\" data-id=\"3daff13\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Why is DNS so important?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2d0a495 elementor-widget elementor-widget-text-editor\" data-id=\"2d0a495\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>First introduced in the <strong>Unix operating system,<\/strong> DNS quickly gained in popularity, and its deployment accelerated in the 1990s when the World Wide Web became accessible to the general public.<\/p><p>Indeed, with the explosion in the number of web sites, the efficiency of the domain name resolution system became essential: its main role is to facilitate access to web sites and online services, using names that are easier to remember than complex IP addresses. This improves the user experience for all Internet users.<\/p><p>However, the importance of this system doesn&#8217;t stop there. It can also be used to distribute the load between several servers, particularly for popular websites whose content is hosted on several machines.DNS can be configured to distribute user requests between these servers, enabling a balanced distribution of traffic and therefore better performance.<\/p><p>In addition to websites, DNS also plays a crucial role for other Internet services such as e-mail. It enables the resolution of e-mail addresses (SMTP), the location of mail servers, and the management of SPF (Sender Policy Framework) records to combat spam.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4d1384b elementor-widget elementor-widget-image\" data-id=\"4d1384b\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/dns-data-science-datascientest1.jpg\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"><\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-31587aa elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"31587aa\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Learn all about DNS functions<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ea6d560 e-flex e-con-boxed e-con\" data-id=\"ea6d560\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dd418c5 elementor-widget elementor-widget-heading\" data-id=\"dd418c5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The role of DNS in Data Science<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-37d7f9c elementor-widget elementor-widget-text-editor\" data-id=\"37d7f9c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>In <strong>Data Science, the Domain Name System<\/strong> plays an important role. It is often used as a means of collecting data, as<strong> DNS queries<\/strong> can provide valuable information about users&#8217; online behavior.<\/p><p>For example, they can reveal which websites are visited, what searches are carried out and how users interact with online services. This data can be used for <strong>behavioral analysis<\/strong>, market research and trend forecasting.<\/p><p>The geographic location of the DNS servers used can also provide indications of the geographical distribution of users and online resources. This is a valuable asset for<strong> targeting advertising campaigns or demographic profiling.<\/strong><\/p><p>Similarly,<strong> using DNS<\/strong> to resolve domain names into IP addresses enables network traffic to be understood and analyzed. In particular, records help to identify servers used, domains visited, response times or resolution errors.<\/p><p>This information is essential for monitoring and optimizing network performance, and for detecting anomalies or malicious activity.<\/p><p>By the same token, computer attacks such as malware, botnets or phishing attacks often exploit <strong>DNS to carry out their actions.<\/strong><\/p><p>In fact, by monitoring and analyzing DNS queries, it is possible to detect suspicious patterns of activity, malicious or compromised domains. This enables appropriate security mechanisms to be put in place and detection systems to be strengthened.<\/p><p>DNS also plays a key role in<a href=\"https:\/\/datascientest.com\/en\/terraform-using-gcp-to-deploy-your-infrastructure\"> IT infrastructure<\/a> management. Domain name management systems enable online resources such as servers, applications and services to be configured and managed efficiently.<\/p><p>Efficient<strong> DNS management<\/strong> therefore facilitates scalability, load balancing and resource redundancy to ensure the performance and scalability of Data Science operations.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-90d0b80 e-flex e-con-boxed e-con\" data-id=\"90d0b80\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4480653 elementor-widget elementor-widget-heading\" data-id=\"4480653\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The main DNS components<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e68a47 elementor-widget elementor-widget-text-editor\" data-id=\"5e68a47\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>DNS<\/strong> is based on several components. Firstly, the servers are the essential elements of the system. They are distributed at different levels of the hierarchy and store the resolution information for the various domains.<\/p><p><strong>DNS<\/strong> servers can be of different types, including top-level domain (TLD) name servers, second-level domain (SLD) name servers and authoritative servers.<\/p><p>To manage records,<strong> DNS uses zones.<\/strong> Each zone is a part of the namespace managed by a specific authority.<\/p><p>Each zone contains records that define the various information associated with the domain, such as A records (IP addresses), MX records (mail servers), CNAME records (aliases)&#8230;<\/p><p>Finally, to improve performance and reduce Internet traffic, the system uses caching. Each time a server receives a request to resolve a domain name, it can cache the response for a set period of time.<\/p><p>This avoids having to consult higher-level servers again for the same request, thus speeding up resolution.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7df76ec elementor-widget elementor-widget-image\" data-id=\"7df76ec\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/dns-data-science-datascientest2.jpg\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"><\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ef130d9 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"ef130d9\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Master the main DNS components<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8530c23 e-flex e-con-boxed e-con\" data-id=\"8530c23\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9139014 elementor-widget elementor-widget-heading\" data-id=\"9139014\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">DNS challenges and problems<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0edbc57 elementor-widget elementor-widget-text-editor\" data-id=\"0edbc57\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Despite its many advantages, <strong>DNS is an old system with a number of problems.<\/strong> First of all, it is subject to various vulnerabilities and attacks.<\/p><p><strong>Examples include distributed denial of service (DDoS) attacks,<\/strong> DNS hijacking attacks and DNS pollution attacks. These can have a significant impact on Internet availability and security.<\/p><p>In addition, when a change is made to the<strong> DNS<\/strong> configuration, it can take some time for this modification to propagate across all servers. This propagation delay can lead to temporary inconsistencies and availability problems.<\/p><p>Traditional DNS also operates in the clear. This means that all queries and associated responses are visible and can be intercepted. This can pose a problem in <a href=\"https:\/\/datascientest.com\/en\/records-manager-a-key-data-governance-job\">terms of confidentiality and user protection.<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dc0fd15 e-flex e-con-boxed e-con\" data-id=\"dc0fd15\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4457040 elementor-widget elementor-widget-heading\" data-id=\"4457040\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The future of DNS<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3761f7a elementor-widget elementor-widget-text-editor\" data-id=\"3761f7a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>In order to adapt to modern constraints, <strong>DNS<\/strong> has evolved over the last few years. Since 2018, DNS over HTTPS (DoH) aims to enhance the confidentiality of queries by encapsulating them in secure HTTPS connections.<\/p><p>This hides DNS queries from prying eyes and offers enhanced protection against interception and manipulation.<\/p><p>Another method of securing DNS queries is DNS over TLS (DoT), introduced in 2016. It encrypts queries using the Transport Layer Security (TLS) protocol to prevent interception attacks.<\/p><p>DNS Security Extensions (DNSSEC) are designed to reinforce the integrity and authenticity of DNS data. They use digital signatures to verify records, offering protection against hijacking attacks.<\/p><p><strong>DNS also plays a key role in IPv6 address resolution,<\/strong> which is becoming increasingly popular in the face of IPv4 address exhaustion. It therefore enables a smooth transition to this new addressing protocol.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d444ba9 e-flex e-con-boxed e-con\" data-id=\"d444ba9\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e94e800 elementor-widget elementor-widget-heading\" data-id=\"e94e800\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Conclusion: DNS, the invisible pillar of the Internet<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6539b6d elementor-widget elementor-widget-text-editor\" data-id=\"6539b6d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Indispensable to the smooth running of the Internet, DNS plays a key role both for website access and for other online services such as websites.<\/p><p>This system has evolved over time to meet the <a href=\"https:\/\/datascientest.com\/en\/cybersecurity-the-ultimate-guide\">challenges of cybersecurity<\/a> and data protection.<\/p><p>It is also one of the technologies you need to know if you want to work in Data Science.<\/p><p>To acquire all the skills you need to become a Data Scientist, Data Analyst or Data Engineer, you can choose DataScientest training courses.<\/p><p>Our various programs enable you to discover the Python programming language, databases, analysis techniques, Business Intelligence and Machine Learning.<\/p><p>All our training courses are distance learning, and are eligible for funding options. At the end of the course, you can obtain certifications issued by our partner MINES ParisTech PSL Executive Education or by cloud providers AWS and Microsoft Azure. Discover DataScientest now!<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-de2fc2a elementor-widget elementor-widget-image\" data-id=\"de2fc2a\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/dns-data-science-datascientest3.jpg\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"><\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55ea7fd elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"55ea7fd\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Discover our training courses<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c8a2b08 elementor-widget elementor-widget-text-editor\" data-id=\"c8a2b08\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>You know all about DNS. For more information on the same subject, take a look at our complete dossier on data analysis and our dossier on the Data Scientist profession.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a9bdd41 e-flex e-con-boxed e-con\" data-id=\"a9bdd41\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-23f973e elementor-widget elementor-widget-html\" data-id=\"23f973e\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [{\n    \"@type\": \"Question\",\n    \"name\": \"What is DNS?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"The Domain Name System (DNS) is a hierarchical domain name system that translates domain names into numerical IP addresses. It links familiar domain names such as \"www.exemple.com\" to unique IP addresses like \"192.168.0.1\", which identify servers and computers on the Internet. The system is based on a hierarchy of servers. When a user enters a domain name in the browser, the browser sends a DNS query to the local DNS server (also known as the resolver). If the resolver already has the answer in its cache, it returns it directly to the user. Otherwise, it begins the DNS resolution process, querying DNS servers higher and higher up the hierarchy until it obtains the appropriate response.\"\n    }\n  },{\n    \"@type\": \"Question\",\n    \"name\": \"Why is DNS so important?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"First introduced in the Unix operating system, DNS quickly gained in popularity and its deployment accelerated in the 1990s when the World Wide Web became accessible to the general public. 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In the early days [&hellip;]<\/p>\n","protected":false},"author":67,"featured_media":179546,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","inline_featured_image":false},"categories":[2422],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Decoding DNS: Exploring the Domain Name System and Its Functions<\/title>\n<meta name=\"description\" content=\"Learn about the Domain Name System (DNS) and its vital role in translating domain names into IP addresses, facilitating internet communication, and enabling seamless web browsing and network connectivity.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/datascientest.com\/en\/decoding-dns-exploring-the-domain-name-system-and-its-functions\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Decoding DNS: Exploring the Domain Name System and Its Functions\" \/>\n<meta property=\"og:description\" content=\"The Domain Name System (DNS) is one of the key elements enabling the Internet to function. Like a virtual telephone directory, it converts domain names\" \/>\n<meta property=\"og:url\" content=\"https:\/\/datascientest.com\/en\/decoding-dns-exploring-the-domain-name-system-and-its-functions\" \/>\n<meta property=\"og:site_name\" content=\"DataScientest\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/DataScientestEN\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-09T16:12:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-22T19:27:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/datascientest.com\/en\/files\/2024\/04\/DNS.png\" \/>\n\t<meta property=\"og:image:width\" content=\"768\" \/>\n\t<meta property=\"og:image:height\" content=\"422\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Melanie\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DataScientest__\" 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