I am seeing a need to better understand DNS for IPv4, both Bind 9.8 implementation and enough theory to explain it to others. As usual, there's not enough time for "the ideal path". I need to grok DNSSEC, geographic disperal, and how to test. Don't mind buying a book or two, but the O'Reilly is from 2006 and way outdated. Any recommendations? Thanks! Leam