Can't set up DNS server with BIND9

Solution 1:

1. What do the logs tell you?
2. BIND searches for the zone file in /var/named/aaa.a.bg.zone while you say it is in /var/aaa.a.bg.zone.
3. You are querying 192.168.1.1 but it is not clear this is the IP address of the authoritative name server that you are trying to set up.
4. Your SOA record mentions n1.aaa.a.bg but this A record does not exist. You meant ns1.aaa.a.bg.
5. You should have two different authoritative name servers. NS1 and NS2 must be two different servers, not two names pointing towards the same server.
6. This record seems incorrect (though not causing an issues, it does not what you expect it does):

aaa.a.bg IN     A       87.246.51.10

Since it does not end in a dot, it gets the domain appended to it so it becomes aaa.a.bg.aaa.a.bg.. Either at a dot or leave it out because the RR above (with the @) already does exactly the same thing.