Cisco's Internetwork Operating Systems (IOS) software provides the means by which you, the network professional configures and manages Cisco networking devices. Comprehending what happens inside Cisco routers helps network designers and engineers perform your jobs more effectively. By understanding the internal operations of IOS, you can take architectural considerations into account when engineering networks and isolate problems easier when troubleshooting networks. Little has been published that can educate a Cisco user on the internal aspects of IOS at this level, and understanding these concepts will help CCIE candidates on the Cisco Device Operation portion of the CCIE qualification exam. Provides several case studies and review questions and exercises that make it an attractive component of any CCIE self-study program. This book discusses general architecture information that is useful for understanding the various data presented by the router concerning its status.