$TTL 300
@                IN A     127.0.0.1
a                IN CNAME b.domain.tld.
aaa              IN A     127.0.0.3
c                IN CNAME d.domain.tld.
sub              IN A     127.0.0.7
bbb.sub          IN A     127.0.0.4
ccc.sub          IN A     127.0.0.5
e.sub            IN CNAME f.sub.domain.tld.
i.sub            IN CNAME j.sub.domain.tld.
ddd.sub.sub      IN A     127.0.0.6
g.sub.sub        IN CNAME h.sub.sub.domain.tld.
www              IN A     127.0.0.2