DNS (Domain name system).

15.    chgrp named forward.zone
16.    chgrp named reverse.zone
17.    service named start
e.g.
  [root@kalwa2 named]# service named start
     Starting named: [ OK ]
18.  Now test DNS configuration using dig command i.e.dig kalwa2.home.com
NOTE: check for BOLD & UNDERLINED word from the output section for successful DNS configuration.
[root@kalwa2 named]# dig kalwa2.home.com

; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6 <<>> kalwa2.home.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10350
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;kalwa2.home.com. IN A

;; ANSWER SECTION:
kalwa2.home.com. 86400 IN A 192.168.216.131

;; AUTHORITY SECTION:
home.com. 86400 IN NS kalwa2.home.com.

;; Query time: 0 msec
;; SERVER: 192.168.216.131#53(192.168.216.131)
;; WHEN: Tue Jun 16 09:00:44 2015
;; MSG SIZE rcvd: 63