Bind8 (version 9.1 on RH 7.2)... help needed
Hello,I'm completely new into Nameservers could you pls help me? My domain works fine with the browser if I use http://MYDOMAIN.com but with WWW. it does not

What I have/need:
ns1.MYDOMAIN.COM is pinging at -> xxx.xx.xxx.96
ns2.MYDOMAIN.COM is pinging at -> xxx.xx.xxx.102
MYDOMAIN.COM is pinging at -> xxx.xx.xxx.98
WWW.MYDOMAIN.COM -> not working
Here is what I have inside my MYDOMAIN.COM Master zone:
ttl 38400
MYDOMAIN.com. IN SOA ns1.MYDOMAIN.com. dns.MYDOMAIN.com. (
1014223425
10800
3600
604800
38400 )
MYDOMAIN.com. IN NS ns1.MYDOMAIN.com.
MYDOMAIN.com. IN NS ns2.MYDOMAIN.com.
ns1.MYDOMAIN.com IN NS xxx.xx.xxx.96
ns2.MYDOMAIN.com IN NS xxx.xx.xxx.102
MYDOMAIN.com IN A xxx.xx.xxx.98
www.MYDOMAIN.com. IN CNAME xxx.xx.xxx.98
Thanks for your help