{"id":48,"date":"2020-06-11T23:18:01","date_gmt":"2020-06-12T05:18:01","guid":{"rendered":"https:\/\/plusbits.digital\/blog\/?p=48"},"modified":"2020-06-11T23:18:01","modified_gmt":"2020-06-12T05:18:01","slug":"que-son-las-dns","status":"publish","type":"post","link":"https:\/\/plus-bits.com\/blog\/ciberseguridad\/que-son-las-dns\/","title":{"rendered":"\u00bfQu\u00e9 son las DNS?"},"content":{"rendered":"\n<p>DNS viene de las iniciales de Domain Name Systm (sistema de nombre de dominio) y sirve para resolver nombres en las redes, es decir, conocer la direcci\u00f3n IP del lugar donde esta apuntando el dominio al que intentamos accesar.<\/p>\n\n\n\n<p>Cuando una computadora esta conectada a una red, se le asigna una direcci\u00f3n IP, si es una red peque\u00f1a seria f\u00e1cil recordar el numero IP pero y \u00bfsi fueran miles? no seria tarea f\u00e1cil recordarlo, por eso existen LAS DNS para traducir a los dominios web.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Ejemplo: 8.8.8.8 = Google.com<\/p><\/blockquote>\n\n\n\n<p>El sistema DNS se compone por:<\/p>\n\n\n\n<p><strong>Servidor DNS:<\/strong> devuelven la peticiones y resuelven los nombres. Son las direcciones DNS que se colocan en la configuraci\u00f3n de las direcciones de los servidores DNS<\/p>\n\n\n\n<p>Cliente DNS: viene siendo el usuario y realiza peticiones de resoluci\u00f3n de nombre (a los servidores DNS).<\/p>\n\n\n\n<p><strong>Zonas de autoridad:<\/strong> son servidores que tienen signados resolver un conjuntos de dominios determinadosm, tal es el caso de un .COM o un .COM.MX<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>\u00bfComo actua?<\/strong><\/p>\n\n\n\n<p>La respuesta de nombres va mediante una estructura de \u00e1rbol donde los distintos servidores resuelven las direcciones de su zona.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Introducimos www.visitmexico.com<\/li><li>Nuestro sistema hace la petici\u00f3n al servidor DNS<\/li><li>El servidor DNS realiza la solicitud al servidor de la zona de autorizad .com<\/li><li>El servidor encargado .com consulta en una tabla de datos con las direcciones IP de los equipos y los dominios. Si lo encuentra devuelve en donde esta ubicado: CHAD.NS.CLOUDFLARE.COM con la IP 104.22.15.178<\/li><li>El servidor DNS realiza una peticion a CHAD.NS.CLOUDFLARE.COM para ver en que parte de la maquina esta visitmexico.com<\/li><li>El servidor donde esta la pagina encuentra que esta en la direccion IP 79.136.1.244<\/li><li>Entonces la IP 79.136.1.244 devuelve la consulta a nuestro navegador y comienza el intercambio de paquetes para visualizar la informaci\u00f3n.<\/li><\/ol>\n\n\n\n<p>Suena algo complicado y tardado \u00bfno? pues no lo es, los servidores responden en cuesti\u00f3n de micro-segundos. aunque en ocasiones no se realiza todo el proceso si la informaci\u00f3n de los dominios est\u00e1n en memorias cache de los servidores.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DNS viene de las iniciales de Domain Name Systm (sistema de nombre de dominio) y sirve para resolver nombres en[&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":49,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[5],"tags":[26],"class_list":["post-48","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciberseguridad","tag-dns"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u00bfQu\u00e9 son las DNS? 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