Question about CNAME records

Normally when I want to point a subdomain to another domain I would just do 14400 IN

However, If I want to point a full domain do I need to make two records like this? 14400 IN 14400 IN

All adding a cname does is point the dns entry to look up here instead - makes changing / managing multiple things that point at the same server easier. You will still need to configure webservers and what not to accept the domain.

You will need to create both records for the new domain yes, but I believe, “standards” suggest that your entry cannot be a cname in its own right (it does work, but its not recommended).