$TTL 300
@                IN A     127.0.0.1
                 IN A     127.0.0.3
a                IN A     127.0.0.2
b                IN CNAME c.domain.tld.
d                IN A     127.0.0.4
e                IN CNAME f.domain.tld.
ssub             IN A     127.0.0.7
j.ssub           IN A     127.0.0.8
k.ssub           IN CNAME l.ssub.domain.tld.
ub               IN A     127.0.0.5
g.ub             IN A     127.0.0.6
h.ub             IN CNAME i.ub.domain.tld.
