Cuando utilizo mi navegador y entro a mi pagina de inicio que en este
caso es google.com (search), lo que sigue es lo que acontece dentro del log de mi servidor de DNS.
21:26:56 Request from 127.0.0.1 for AAAA-record for
www.google.com.ni.
21:26:56 Sending request to 64.233.161.9 (c.l.google.com.) for AAAA-record for
www.l.google.com.
21:26:56 Reply from 64.233.161.9 about AAAA-record for
www.l.google.com.:
21:26:56 -> Answer: No Matching Records available.
21:26:56 -> Authority: SOA-record for l.google.com. = e.l.google.com. [1313293]
21:26:56 Sending reply to 127.0.0.1 about AAAA-record for
www.google.com.ni.:
21:26:56 -> Answer: CNAME-record for
www.google.com.ni. =
www.google.com.
21:26:56 -> Answer: CNAME-record for
www.google.com. =
www.l.google.com.
21:26:56 -> Authority: SOA-record for l.google.com. = e.l.google.com. [1313293]
21:26:56 Request from 127.0.0.1 for A-record for
www.google.com.ni.
21:26:56 Sending request to 66.249.93.9 (d.l.google.com.) for A-record for
www.l.google.com.
21:26:56 Reply from 66.249.93.9 about A-record for
www.l.google.com.:
21:26:56 -> Answer: A-record for
www.l.google.com. = 64.233.167.99
21:26:56 -> Answer: A-record for
www.l.google.com. = 64.233.167.104
21:26:56 -> Answer: A-record for
www.l.google.com. = 64.233.167.147
21:26:56 Sending reply to 127.0.0.1 about A-record for
www.google.com.ni.:
21:26:56 -> Answer: CNAME-record for
www.google.com.ni. =
www.google.com.
21:26:56 -> Answer: CNAME-record for
www.google.com. =
www.l.google.com.
21:26:56 -> Answer: A-record for
www.l.google.com. = 64.233.167.99
21:26:56 -> Answer: A-record for
www.l.google.com. = 64.233.167.104
21:26:56 -> Answer: A-record for
www.l.google.com. = 64.233.167.147
Observen que google.com tiene tanto movimiento que utiliza tres Ip
para atender a sus usuarios.
La peticion duro menos de 1 segundo y viajo miles de kilometros de distancia!.
Google.com son los lideres en reduccion de latencia en las redes y lo hacen
estableciendo dominios en la mayoria de paises del mundo.
Saludos
Y espero les ayude a entender los Servidores DNS.
Franco.