cloud.z.com.            	300	IN  	CNAME	gslb.www.cloud.z.com.

cloud.z.com.            	300	IN  	NS	ns-a1.cloud.z.com.
cloud.z.com.            	300	IN  	NS	ns-a2.cloud.z.com.
cloud.z.com.            	300	IN  	NS	ns-a3.cloud.z.com.