Q. Suppose I have contracted for both parent zone and child zone, will DNSSEC for child zones be enabled as I enable DNSSEC for the parent zone?
To apply DNSSEC to child zones (subdomains), the parent zone must be enabled. It is not possible to enable child zones only.
To enable child zones, you need to enable "DNSSEC Signature Settings" on the child zone side.
When you have signed up for both parent zone and child zone, if "DNSSEC Signature Settings" are enabled only for child zones, DS records on the child zones will be registered in the parent zone and become enabled on the screen. However, DNSSEC validation will not be possible unless "DNSSEC Signature Settings" on the parent zone side are enabled.