@   IN  SOA     ns.vulhub.org.  sa.vulhub.org. ( 
    1            ; serial number 
    3600         ; refresh   [1h] 
    600          ; retry     [10m] 
    86400        ; expire    [1d] 
    3600 )       ; min TTL   [1h]

  IN  NS   ns1
  IN  NS   ns2

ns1 IN  A   10.0.0.1
ns2 IN  A   10.0.0.2
www IN  A   10.1.1.1
sa  IN  A   10.1.1.2
cdn IN  A   10.1.1.3
admin IN  A   10.1.1.4
wap IN CNAME   www
static IN CNAME www
git IN A   10.1.1.4