In reading this book, you’ll find that I frequently refer to other books that explain concepts more completely than I can (at least, not without making this book twice its size). Here are books with good explanations of the details.
Albitz, Paul and Cricket Liu, DNS and Bind (O’Reilly Media, 1997).
Back, Maurice, Design of the Unix Operating System (Prentice Hall, 1986).
Ballew, Scott, Managing IP Networks with Cisco Routers (O’Reilly Media, 1997).
Blake, Russ, Optimizing Windows NT (Microsoft Press, out of print).
Brooks, Fredrick P., Jr., The Mythical Man-Month (Addison Wesley, 1995).
Chapman, Brent and Elizabeth Zwicky, Building Internet Firewalls, Second Edition (O’Reilly Media, 2001).
Cockcroft, Adrian and Richard Pettit, Sun Performance and Tuning, Second Edition (Prentice Hall, 1998). Everything about tuning Solaris and Sun hardware.