Further reading
To learn more on the subject:
- Definitive DNS references
Basic DNS has literally dozens of RFCs that define the service as well as best practices for implementation. A good list of these RFCs can be found here: https://en.wikipedia.org/wiki/Domain_Name_System#RFC_documents.
However, if you need more detail on DNS and are looking for a more readable guide through the protocol and implementation details than the RFCs (emphasis on "readable"), many consider Cricket Liu's books to be an excellent next step:
DNS and BIND by Cricket Liu and Paul Albitz:
https://www.amazon.ca/DNS-BIND-Help-System-Administrators-ebook/dp/B0026OR2QS/ref=sr_1_1?dchild=1&keywords=dns+and+bind+cricket+liu&qid=1614217706&s=books&sr=1-1
DNS and BIND on IPv6 by Cricket Liu:
https://www.amazon.ca/DNS-BIND-IPv6-Next-Generation-Internet-ebook/dp/B0054RCT4O/ref=sr_1_3?dchild=1&keywords=dns+and+bind+cricket+liu&qid=1614217706&s=books&sr=1-3
- DNS UPDATE...
