Study for the CCNA Exam and you'll find that there are several books on the subject. However when a great book is coupled with an excellent testing package you'll find the study time is reduced.
The 2-book reference is a great set of material for the classroom or self-study. Book 1 - CCNA Study Guide covers the topics of the OSI Model, 802, standards, topologies, bridging & switching, IOS Commands, TCP/IP addressing and subnetting.
Also covered are IP Protocols, VLANS, IPX, and ISDN. ATM and Frame Relay. The book included hands-on exercises, Lab questions, and self-test at the end of each chapter. The book also details the 1900 switch, which is essential to passing the exam.
Book 1 also has a cd-rom included with over 300 practice questions. The cd includes CertTrainer, which is a self-paced trainer for the CCNA Exam. ExamSim is the practice exam software that simulates the real exam.
In book 2 - CCNA Test Yourself, you'll be given over 300 questions that cover areas like Bridging, switching, routing protocols, access lists, ISDN, PPP, frame relay and OSI. Also there is 1 practice test included in the book and you have the ability to download more questions from the web.