named.conf

options {
  directory "/var/cache/bind";
  dnssec-validation auto;
  listen-on-v6 { any; };

#  allow-query { any; };
#  allow-recursion { any; };
#  forwarders { 1.1.1.1; };
};

zone "example.local" {
  type master;
  file "/etc/bind/db.example_local";
};

db.example_local

$TTL 50
@	IN SOA	ns1.example.local. ns2.example.local. (1 60 60 60 60)
	IN NS	ns1
	IN NS	ns2
ns1	IN A	127.0.0.1
ns2	IN A	127.0.0.1

The DNS spec needs 2 servers.

# dig @ 
dig @8.8.8.8 cnn.com

# dig +short @  
dig +short @8.8.8.8 A cnn.com
dig +short @8.8.8.8 AAAA cnn.com