{"id":7742,"date":"2019-01-10T00:48:12","date_gmt":"2019-01-10T00:48:12","guid":{"rendered":"https:\/\/www.appservgrid.com\/paw92\/?p=7742"},"modified":"2019-01-12T09:40:17","modified_gmt":"2019-01-12T09:40:17","slug":"dns-domain-name-service-a-detailed-high-level-overview-linux-com","status":"publish","type":"post","link":"https:\/\/www.appservgrid.com\/paw92\/index.php\/2019\/01\/10\/dns-domain-name-service-a-detailed-high-level-overview-linux-com\/","title":{"rendered":"DNS (Domain Name Service): A Detailed, High-level Overview | Linux.com"},"content":{"rendered":"

DNS (Domain Name Service): A Detailed, High-level\u00a0Overview<\/a><\/h1>\n
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How\u2019s that for a\u00a0confuding\u00a0<\/a>title?\u00a0 In a recent email discussion, a colleague compared the\u00a0Decentralized Identifier<\/a>\u00a0framework to\u00a0DNS\u00a0<\/a>\u2026suggesting they were similar.\u00a0 I cautiously tended to agree but felt I had an overly simplistic understanding of DNS at a protocol level.\u00a0 That email discussion led me to learn more about the deeper details of how DNS actually works \u2013 and hence, this article.<\/p>\n

On the surface, I think most people understand DNS to be a service that you can pass a domain name to and have it resolved to an IP address (in the familiar nnn.ooo.ppp.qqq format).<\/p>\n

domain name => nnn.ooo.ppp.qqq<\/p><\/blockquote>\n

Examples:<\/p>\n

    \n
  1. If you click on\u00a0Google DNS Query for microsoft.com<\/a>, you\u2019ll get a list of IP addresses associated with the Microsoft\u2019s corporate domain name\u00a0microsoft.com<\/a>.<\/li>\n
  2. If you click on\u00a0Google DNS Query for www.microsoft.com<\/a>, you\u2019ll get a list of IP addresses associated with the Microsoft\u2019s corporate web site\u00a0www.microsoft.com<\/a>.<\/li>\n<\/ol>\n

    NOTE: The Google DNS Query page returns the DNS results in JSON format. This isn\u2019t particular or specific to DNS. It\u2019s just how the Google DNS Query page chooses to format and display the query results.<\/p>\n

    DNS is actually much more than a domain name to IP address mapping.\u00a0 Read on\u2026<\/p>\n

    DNS Resource Records<\/h2>\n

    There is more to the DNS Service database than these simple (default) IP addresses.\u00a0 The DNS database stores and is able to return many different types of service-specific IP addresses for a particular domain.\u00a0 These are called DNS Resource Records. Here\u2019s a partial list from\u00a0http:\/\/dns-record-viewer.online-domain-tools.com<\/a>:<\/p>\n