I am wondering if an ISP or network admin on my network would be able to change where a DNS server is located at (ex: if a DNS server is located at 132.192.175.210, the ISP/netadmin can redirect it to their own server at 11.29.102.201 to change where the DNS records point to). Does DNSSEC and DoH/DoT combat this, and how? Why is it safe to use a domain for DoH/DoT if it requires going through insecure DNS to get to a secure DNS?
The other thing to consider of course is that if you use DoH/DoT, you still have to trust THAT DNS authority. All you’ve guaranteed is that a secure lookup and response transaction has hit their server, not that their server is providing an authoritative result and the operator isn’t storing/selling your requests.