So, one of the methods to verify if a domain is legitimate or not is to check out it's DNS records and their interconnection. The ones I could find are.
- NS and PTR record
- A and AAAA pointing to same address (so that the same website is served) etc.
There may be more. My question is are their any other DNS records that are interrelated and existence of one implies/is required for the other in order to function legitimately?