Configure caching DNS server for your small office so save turn around time of your networks dns quries:
1) Install bind if already not installed from your installation CDs
rpm required as below:
bind-9.2.4-2
bind-chroot-9.2.4-2
caching-nameserver-7.3-3

[root@redhat-testmac1 ~]# rpm -Uvh bind-9.2.4-2.i386.rpm bind-chroot-9.2.4-2.i386.rpm caching-nameserver-7.3-3.noarch.rpm

Or
use GUI to install DNS server from Add remove programs as below screen shots:

1.a)
1.b) select the DNS [...]