DNS cannot be resolved

DNS cannot parse -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. My DNS cannot be resolved in nslookup, but can be pinged. The following is the configuration file:

/Var/named/dns. arpa
$ TTL 86400
@ In soa dns.com. admin.dns.com .(
77191
604800
86400
2419200
604800)
@ In ns dns.com.
117 in ptr mail.dns.com.
117 in ptr www.dns.com.
117 in ptr ns.dns.com.

/Var/named/dns. zone
$ TTL 86400
$ ORIGIN dns.com.
@ In soa ns.dns.com. admin.dns.com .(
511
1 H
15 M
1 W
1D)
In ns ns.dns.com.
Ns in a 192.168.2.117
Www in a 192.168.2.117
Mail in a 192.168.2.117
Dns.com in mx 10 mail.dns.com.


/Etc/named. conf
Zone "dns.com" IN {
Type master;
File "dns. zone ";
};
Zone "Limit 192.in-addr. arpa" IN {
Type master;
File "dns. arpa ";
};