DNS configuration problems

DNS configuration problems-Linux Enterprise Application-Linux server application information, the following is a detailed description. I just learned about DNS, but I don't know much about it. I sent my configuration file to you to see what went wrong:
1. named. conf/etc/named. conf/var/named/chroot/etc/named. conf
Options {
Directory "/etc ";
Pid-file "/var/run/named. pid ";
};

Zone "." IN {
Type hint;
File "/etc/db. cache ";
};

Zone "rocklinux.com" IN {
Type master;
File "/var/named/rocklinux.com. hosts ";
Allow-update {none ;};
};

Zone "255.168.192.in-addr. arpa" IN {
Type master;
File "/var/named/20. zone ";
Allow-update {none ;};
};

Zone "fancy.com" IN {
Type master;
File "/var/named/fancy.com. zone ";
Allow-update {none ;};
};

2. 192.168.20.rev
$ TTL 86400
@ In soa rocklinux.com. root.rocklinux.com .(
1997022702
28800
14400
3600000
86400)
In ns fancy
198 in ptr mail.rocklinux.com
198 in ptr www.rocklinux.com
198 in ptr mail.fancy.com
198 in ptr www.fancy.com
3. rocklinux.com. hosts
$ Ttl 86400
@ In soa rocklinux.com. root.rocklinux.com .(
1313200432
10800
3600
604800
38400)
In ns fancy
In mx 10 mail
Fancy in a 192.168.20.198
Www in a 192.168.20.198
Mail in a 192.168.20.198


4. nslookup mail.rocklinux.com
Server: 192.168.20.198
Address: 192.168.20.198 #53

Name: mail.rocklinux.com
Address: 192.168.20.198

5. nslookup 192.168.20.198
Server: 192.168.20.198
Address: 192.168.20.198 #53

198.20.168.192.in-addr. arpa name = mail.fancy.com. g0168.192.in-addr. arpa.
198.20.168.192.in-addr. arpa name = www.fancy.com. g0168.192.in-addr. arpa.