Cisco Access Lists Field Guide
When configuring Cisco routers, you can take one of two approaches. If  you're keen on expending a lot of time and energy, you can distill the contents  of Cisco documentation into real-life access lists that make the routers do what  your organization needs. Or you can open up theCisco Access Lists Field  Guideand see what solutions authors Gil Held and Kent Hundley have created  for you. They've compiled a sort of recipe book, in which they present problems  that access lists can solve, then provide a listing of an access list that  solves the stated problem. Though it would be better if the solutions appeared  on a CD-ROM or on the Internet somewhere, this book is nonetheless  extraordinarily valuable to people involved in configuring Cisco routing  equipment.This book is more than a straightforward listing of problems and solutions. Held  and Hundley make theCisco Access Lists Field Guidesomething of a  tutorial in two ways. First, a couple of introductory chapters explain the  fundamentals of access lists, including how they fit into the larger router  architecture and how they're maintained. Second, the authors present their  listings in conjunction with lots of high-quality commentary. They'll state  their problem in detail, then list the solution, then (most valuably) call  attention to individual lines in the access list and explain what they're for.  This material makes this book valuable to those technicians interested in  learning for the long term, not just solving problems in the immediate context.--David WallTopics covered: Access lists for Cisco routers, organized by the  functions they perform. There's coverage of time-based access lists, dynamic  access lists, reflexive access lists, context-based access control, address  translation, and security functions (including those defined by IPSec).