$TTL 3600
$ORIGIN sub2.cname.recursor.engine.xa.

@                          SOA  (
                                   ns1
                                   root
                                   2023103100
                                   86400
                                   14400
                                   3600000
                                   3600
                                 )

@                          NS    ns1
ns1                        A     127.30.1.32
ns1                        AAAA  fda1:b2:c3:0:127:30:1:32

; For scenario LOOPED-CNAME-OUT-OF-ZONE
looped-cname-out-of-zone   CNAME   looped-cname-out-of-zone.sub3.cname.recursor.engine.xa.