{"id":68540,"date":"2018-12-14T05:42:54","date_gmt":"2018-12-14T05:42:54","guid":{"rendered":"https:\/\/www.whizlabs.com\/blog\/?p=68540"},"modified":"2021-02-01T08:24:13","modified_gmt":"2021-02-01T08:24:13","slug":"dns-records","status":"publish","type":"post","link":"https:\/\/www.whizlabs.com\/blog\/dns-records\/","title":{"rendered":"Demystifying DNS Records &#8211; A, CNAME, ALIAS, MX &#038; AAAA"},"content":{"rendered":"<p style=\"text-align: justify;\">So AWS Aspirants, how&#8217;s your preparation going on for AWS Certification exam? In this blog, we&#8217;ll demystify the DNS Records to help you with your AWS certification preparation. DNS Records is one of the basic topics that you should know for any <a href=\"https:\/\/www.whizlabs.com\/blog\/which-aws-certification-should-i-choose\/\" target=\"_blank\" rel=\"noopener noreferrer\">AWS Certification Exams<\/a>. Note that for AWS Certified SysOps Administrator exam, it is a must-read topic.<\/p>\n<p style=\"text-align: justify;\">Whizlabs always encourages aspirants to ask questions and submit their queries whatever they come across while preparing with our practice tests or online courses. Our team of certified subject matter experts is always ready to answer the questions. As we submit detailed answers to the query, we thought to post the queries we receive with a detailed solution here on our blog for our readers too.<\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/aws-solutions-architect-associate\/online-course\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"size-full wp-image-69376 aligncenter\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/sites\/2\/2018\/08\/AWS_Certified_Solutions_Architect_Associate_Online_Course.gif\" alt=\"AWS Certified Solutions Architect Associate Online Course\" width=\"728\" height=\"90\" \/><\/a><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Here\u2019s a question that we&#8217;ve recently received (Nov 2018) from one of our existing customers:<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #ea7e02;color:#ea7e02\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #ea7e02;color:#ea7e02\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#Question_Statement\" >Question Statement:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#Solution_An_Explanation_to_DNS_Records_with_Practical_Examples\" >Solution: An Explanation to DNS Records with Practical Examples<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#A_Record\" >A Record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#CNAME_Record\" >CNAME Record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#Alias_Record\" >Alias Record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#Alias_Record_vs_CNAME_Record\" >Alias Record vs. CNAME Record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#AAAA_Record\" >AAAA Record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/#MX_Record\" >MX Record<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Question_Statement\"><\/span>Question Statement:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">I\u2019m preparing for an AWS Certifications <\/span><span style=\"font-weight: 400;\">examination. While practicing the Whizlabs Practice Tests, I often come across DNS records viz. \u00a0A Record, CNAME, MX Record, Alias, and AAAA Record. These records sound a bit confusing to me. Can I have a summary of when to use A Record, CNAME, MX Record, Alias or AAAA Record? Practical examples would help.<\/span><\/p>\n<p><img decoding=\"async\" class=\"wp-image-68542 size-full aligncenter\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/sites\/2\/2018\/12\/dns-records.png\" alt=\"DNS Records\" width=\"404\" height=\"279\" srcset=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/dns-records.png 404w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/dns-records-300x207.png 300w\" sizes=\"(max-width: 404px) 100vw, 404px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Solution_An_Explanation_to_DNS_Records_with_Practical_Examples\"><\/span>Solution: An Explanation to DNS Records with Practical Examples<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The DNS records can sound a bit puzzling for beginners. So, here we compile a brief explanation of the DNS records in plain English that will help you to prepare for any AWS certification exam.\u00a0Hope this post will help you in grabbing a few bonus marks in your certification exam.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"A_Record\"><\/span>A Record<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><b>A<\/b><span style=\"font-weight: 400;\"> record (or Address record) value is always an IP address. The IP should be static i.e. it should not change frequently. For example, Elastic IPs in AWS are static IPs. <\/span><\/p>\n<p style=\"text-align: justify;\"><b>Use Case: <\/b><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><b>A<\/b><span style=\"font-weight: 400;\"> record will be used to map your root\/naked domain-name viz <\/span><strong>example.com<\/strong><span style=\"font-weight: 400;\"> \u00a0to \u00a0Elastic IP say 198.51.100.77. <\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">You can map an IPv4 Public IP with <\/span><b>A<\/b><span style=\"font-weight: 400;\"> record. But it is not recommended as Public IP can change when you STOP &amp; START an EC2 instance.<\/span><\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"CNAME_Record\"><\/span>CNAME Record<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><b>CNAME <\/b><span style=\"font-weight: 400;\">record maps a name to another name. It can never be an IP address. Let\u2019s understand it with a common use case from the industry.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>Use Case:<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">You can point <\/span><strong>example.com<\/strong><span style=\"font-weight: 400;\"> and <\/span><strong>www.example.com<\/strong><span style=\"font-weight: 400;\"> to the same website hosted at the same server. Here\u2019s how it is generally implemented:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">An <\/span><b>A record <\/b><span style=\"font-weight: 400;\">for <\/span><strong>example.com<\/strong><span style=\"font-weight: 400;\"> (i.e. root\/naked domain) points to the server IP address<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">A <\/span><b>CNAME <\/b><span style=\"font-weight: 400;\">record for <\/span><strong>www.example.com<\/strong><span style=\"font-weight: 400;\"> points to <\/span><strong>example.com<\/strong><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">To simplify it we can say that <strong>example.com<\/strong> points to the server IP address using A record, and <\/span><strong>www.example.com<\/strong><span style=\"font-weight: 400;\"> points to the same address via <\/span><strong>example.com<\/strong><span style=\"font-weight: 400;\"> using a CNAME record. (Read Now &#8211; <a href=\"https:\/\/www.whizlabs.com\/blog\/dns-records\/\" target=\"_blank\" rel=\"noopener\">CNAME vs Alias<\/a>)<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Now if the IP address of the server is changed, you only need to update it in one place: just edit the A record for <\/span><strong>example.com<\/strong><span style=\"font-weight: 400;\">, and <\/span><strong>www.example.com<\/strong><span style=\"font-weight: 400;\"> automatically inherits the changes.<\/span><\/p>\n<blockquote><p><em>Having trouble in understanding any AWS topic? Join <a href=\"http:\/\/ask.whizlabs.com\/c\/aws\" target=\"_blank\" rel=\"noopener noreferrer\">Whizlabs Forum<\/a> and ask your query or write us at <a href=\"mailto:support@whizlabs.com\" target=\"_blank\" rel=\"noopener noreferrer\">support@whizlabs.com<\/a>. We&#8217;ll be happy to provide you answer with a detailed explanation.\u00a0<\/em><\/p><\/blockquote>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Alias_Record\"><\/span>Alias Record<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><b>Alias <\/b><span style=\"font-weight: 400;\">record is an Amazon Route 53-specific virtual record. \u00a0So, it works only with Amazon Route 53. Whenever you come across questions related to mappings of Amazon specific resources\/ services say Amazon ELBs (Elastic Load Balancers), Amazon CloudFront distributions, AWS Elastic Beanstalk environments, or Amazon S3 buckets that are configured as websites, it should ring a bell for you to consider Alias record in Route 53. <\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Alias records may sound similar to CNAME but they&#8217;re different.<\/span><\/p>\n<p><a href=\"https:\/\/www.whizlabs.com\/aws-sysops-administrator-associate\/free-test\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"size-full wp-image-68554 aligncenter\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/sites\/2\/2018\/12\/aws-certified-sysops-free-test.jpg\" alt=\"aws certified sysops - free test\" width=\"728\" height=\"90\" srcset=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/aws-certified-sysops-free-test.jpg 728w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/aws-certified-sysops-free-test-300x37.jpg 300w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/aws-certified-sysops-free-test-640x79.jpg 640w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/aws-certified-sysops-free-test-681x84.jpg 681w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/a><\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Alias_Record_vs_CNAME_Record\"><\/span>Alias Record vs. CNAME Record<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Alias records are similar to CNAME records with a minor but important difference. Alias records are there to solve a specific issue described below:<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">AWS Elastic Load Balancers, Amazon CloudFront distributions, AWS Elastic Beanstalk environments, or Amazon S3 buckets &#8211; all these services offer you a DNS Name (i.e. a DNS name like: \u201cMyELB-123456-&lt;aws-region&gt;.amazon.com\u201d &amp; not an IP address). <\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Now if you want to map your naked\/root domain <strong>example.com<\/strong> to your Elastic Load Balancer what options do you have? From the above discussion, do you remember that<\/span><b> A<\/b><span style=\"font-weight: 400;\"> records allow only IP addresses whereas CNAME records though they allow names cannot be mapped with a root or naked domain! (Read the last line carefully until you understand it).<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Yes, you might have understood it by now. To sort out this issue Amazon came up with a record known as Alias record in Route 53 which handles this issue. Alias record will allow ELB DNS name (or any other DNS names produced by AWS services like CloudFront, S3 etc) to be mapped with the root domain name in Route 53.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">A CNAME can\u2019t be used for naked\/root domain names. Root domain names must be mapped with either an A record or an Alias record (in Route 53).<\/span><\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"AAAA_Record\"><\/span>AAAA Record<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><b>AAAA <\/b><span style=\"font-weight: 400;\">record is similar to an <\/span><b>A<\/b><span style=\"font-weight: 400;\"> record but<\/span><b> it is for IPv6 addresses (<\/b><span style=\"font-weight: 400;\">whereas A record is for IPv4). <\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Elastic IPv6 addresses are not supported.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">The format of IPv6 is 128-bit, 8 groups of 4 hexadecimal digits.<\/span><\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"MX_Record\"><\/span>MX Record<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><b>MX<\/b><span style=\"font-weight: 400;\"> records (Mail Exchange records) is used for<\/span><span style=\"font-weight: 400;\"> setting up <\/span><b>Email servers<\/b><span style=\"font-weight: 400;\">. MX records must be mapped correctly to deliver email to your address.<\/span><\/p>\n<h4 style=\"text-align: justify;\">Summary<\/h4>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Here\u2019s an image that summarizes the DNS records that we discussed in this blog:<\/span><\/p>\n<p><img decoding=\"async\" class=\"wp-image-68543 size-full aligncenter\" src=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/sites\/2\/2018\/12\/dns-records-summary.png\" alt=\"DNS Records\" width=\"600\" height=\"490\" srcset=\"https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/dns-records-summary.png 600w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/dns-records-summary-300x245.png 300w, https:\/\/www.whizlabs.com\/blog\/wp-content\/uploads\/2018\/12\/dns-records-summary-514x420.png 514w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<p style=\"text-align: left;\">For More information Refer:<b>\u00a0<\/b><a href=\"https:\/\/docs.aws.amazon.com\/Route53\/latest\/DeveloperGuide\/resource-record-sets-choosing-alias-non-alias.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400;\">https:\/\/docs.aws.amazon.com\/Route53\/latest\/DeveloperGuide\/resource-record-sets-choosing-alias-non-alias.html<\/span><\/a><\/p>\n<p style=\"text-align: justify;\">DNS records is an important topic that you must fully understand for AWS certifications. Hope this simple explanation has helped you understand the topic well. We at Whizlabs are always determined to help you in your AWS certification preparation. With the same purpose, we&#8217;ve prepared <a href=\"https:\/\/www.whizlabs.com\/aws-certifications\/\" target=\"_blank\" rel=\"noopener noreferrer\">AWS Certifications training<\/a> that will give your AWS certification preparation a new edge.<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Other Helpful Resources<\/p>\n<p style=\"text-align: justify;\"><span class=\"s1\"><a href=\"https:\/\/www.whizlabs.com\/blog\/ephemeral-ports\/\" target=\"_blank\" rel=\"noopener noreferrer\">Simplifying Ephemeral Ports with Example<\/a><\/span><\/p>\n<p style=\"text-align: justify;\"><span class=\"s1\"><a href=\"https:\/\/www.whizlabs.com\/blog\/s3-one-zone-ia-vs-s3-standard-ia\/\" target=\"_blank\" rel=\"noopener noreferrer\">S3 One Zone IA vs S3 Standard IA \u2013 Which One to Use and When?<\/a><\/span><\/p>\n<p style=\"text-align: justify;\"><span class=\"s1\"><a href=\"https:\/\/www.whizlabs.com\/blog\/route-53-policies\/\" target=\"_blank\" rel=\"noopener noreferrer\">Route 53 Policies: Latency-based Routing vs Geolocation Routing<\/a><\/span><\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\">Along with Whizlabs online course and practice test series, you get <strong>24*7 support<\/strong> from our team of certified, subject matter experts. So, join us today and lay the foundation of a certified future!<\/p>\n<p style=\"text-align: justify;\"><em>Having trouble in understanding any AWS topic? Just mention in the comment below or submit at <a href=\"https:\/\/help.whizlabs.com\/hc\/en-us\/requests\/new\" target=\"_blank\" rel=\"noopener noreferrer\">Whizlabs Helpdesk<\/a>, we&#8217;ll provide you answer with a detailed explanation.\u00a0<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>So AWS Aspirants, how&#8217;s your preparation going on for AWS Certification exam? In this blog, we&#8217;ll demystify the DNS Records to help you with your AWS certification preparation. DNS Records is one of the basic topics that you should know for any AWS Certification Exams. Note that for AWS Certified SysOps Administrator exam, it is a must-read topic. Whizlabs always encourages aspirants to ask questions and submit their queries whatever they come across while preparing with our practice tests or online courses. Our team of certified subject matter experts is always ready to answer the questions. As we submit detailed [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":68545,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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