Rating: 

I'm not here to bash BIND -- I've deployed it at a number of .gov, .com, and ISP sites -- but the book is called _DNS & BIND_ and IMHO should at least mention other implementations of domain name servers.

I have found that as I start using the djbdns suite of tools, there is a different philosophy and approach at work and this frequently leads to insights on DNS rather than the _de facto_ BIND view. Equating the global DNS with a single implementation leads to monoculture; alternate implementations of Internet standards are important. They should be at least mentioned in an edition as recent as this.