Hi,
Apart from increasing the serial number as mentioned by the previous poster, you need to add a NS record for the slave dns in both zones, so the master send notifies to slaves:
Code:
...
IN NS masterdns.training.com.
IN NS secdns.training.com.
...
You have also some errors in the reverse zone (two "10 IN PTR ..." RRs and missing the FQDN for the rest)
Code:
...
IN NS masterdns.training.com.
IN NS secdns.training.com.
10 IN PTR training.com.
11 IN PTR secdns. training.com. ;
...
Regards