DNS => Domain Name Server


Hi friends,

Today in slashprog Mr.geraldin took a intro class about DNS.

DNS, the name stands for Domain Name Server. He stared wit “purpose of DNS, History of DNS and how to configure DNS in a redhat m/c” . Today fully he took a theoretical class ly. Today ly i come to know, In over all world, There is a 13 Root Name-server. This 13 Root Name-servers placed in worldwide.

We can see the Root Servers around the globe.

13 Root Name-servers Locations

For more details about Root Name Server.

And one more, today i leant about “dig” command. dig command used for find out the IP Address for a name web-site address.

EX:

dig – DNS lookup utility

 

[root@mercury named]# dig www.google.com

; <<>> DiG 9.7.2-P2-RedHat-9.7.2-2.P2.fc14 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50422
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.            IN    A

;; ANSWER SECTION:
www.google.com.        127823    IN    CNAME    www.l.google.com.
www.l.google.com.    19    IN    A    209.85.231.104

;; Query time: 49 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Sun Feb  6 15:18:50 2011
;; MSG SIZE  rcvd: 68

From above we can see the www.l.google.com. alised to http://www.google.com.

That’s all abt today. Next Sunday may be i ve Demo section on DNS configuration.

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