Reviewer: Jean Mahoney
Review result: Ready with nits

A well-written, easy-to-read document.  Love Appendix A!

Question about Appendix A.2 and Updates - Should this document also update RFC 1536? 

Current text in A.2:  
   The informational document [RFC1536] states UDP is the "chosen
   protocol for communication though TCP is used for zone transfers."
   That statement should now be considered in its historical context and
   is no longer a proper reflection of modern expectations.

Nits:

General - Document status (Informational, Standards Track, etc.) should be capitalized, and Standards Track is not hyphenated (There's just one instance of hyphenation). 

Section 2.4 - 35%of / 35% of 

Section 3 - transport.[TDNS] / transport [TDNS].

Section 5.1 
   Current: "the steady-state of lost resources as a result is a 'DNS wedgie'."
   Perhaps: "the steady state of the resulting lost resources is a 'DNS wedgie'."

Section 5.2 - Expand the acronym KSK.

Section 7 - The Acknowledgments section should be located just above the Authors' Addresses section. It looks like the names are supposed to be in alphabetical order, but they aren't quite. 

Section 9 - fragmenetation / fragmentation

Section 10 -  Since DNS over UDP and TCP use  / Since DNS over UDP and TCP uses   

Section 11.2 - [ROLL_YOU_ROOT] has a mangled author name and a TBD.

Appendix A - The construction "The [RFCNNNN] document..." (in A.3, A.4, A.5, A.7, and A.13) reads oddly to me. Perhaps "This document [RFCNNNN] ". 

Appendix A.8 - The verb tenses are mixed in this section.

Appendix A.32 - as a a / as a

There are other nits I could pick more easily if this doc was in a GitHub repo. They can be left to the RPC to clean up. :-)

Thanks!
Jean